| Total Investments | $265.5B | $276.7B | $276.6B | $285.9B | $293.4B | $305.1B | $320B | $316.3B |
| Policyholder Account Balance, After Reinsurance | $106.5B | $109.6B | $112.1B | $114.8B | $116.2B | $122.1B | $125.3B | $120.9B |
| Aggregate Notional Principal Outstanding | $97.2B | $102.6B | $107.3B | $102.3B | $103.2B | $103.5B | $108.3B | $119.4B |
| Notional | $97.2B | $102.6B | $107.3B | $102.3B | $103.2B | $103.5B | $108.3B | $119.4B |
| Reinsurer collateral, minimum amount held by trusts | $97.4B | $98.9B | $100.2B | $100.4B | $101B | $103.2B | $107.3B | $107.4B |
| Reinsurer collateral, reserves supported by trust assets | $93.4B | $97.3B | $96.9B | $97.1B | $97.7B | $100.3B | $104.1B | $103.6B |
| Cost or Amortized Cost | $83.8B | $84.8B | $85.6B | $86.2B | $89.3B | $94.5B | $96.7B | $94.1B |
| Debt Securities, Available-for-Sale, Amortized Cost, Excluding Accrued Interest, after Allowance for Credit Loss | $83.6B | $84.6B | $85.3B | $86B | $89B | $94.3B | $96.4B | $93.8B |
| Impact Of Consolidation And Other On Assets | $75B | $76.4B | $78.3B | $80.9B | $83.8B | $88.4B | $93.8B | $93.1B |
| Account values with adjustable credit rates subject to guaranteed minimum | $83.1B | $85.3B | $86.5B | $87.6B | $88.2B | $89.8B | $90B | $89.4B |
| Estimated Fair Value | $73.8B | $77.6B | $76.3B | $78.6B | $82.1B | $88.4B | $90.6B | $87.1B |
| Debt Securities, Available-for-Sale, Maturity, Allocated and Single Maturity Date, Amortized Cost | $54.6B | $55.3B | $56.1B | $56B | $58.2B | $62B | $62.1B | $60.5B |
| Reinsurance Recoverable and Funds Withheld Receivable at Interest | $48.1B | $48.9B | $47.8B | $47.8B | $48.1B | $48.9B | $50.3B | $52.7B |
| Collateral held on behalf of reinsurers | $46.7B | $46.9B | $46.6B | $46.5B | $46.6B | $47.4B | $49B | $51.8B |
| Credit Enhancements | $43.9B | $45.4B | $44B | $44.3B | $44.1B | $45.4B | $46.8B | $49.4B |
| Total Assets | $30.4B | $30.7B | $34B | $35.3B | $38.5B | $42.6B | $46.5B | $48.7B |
| Noncontrolling interests in subsidiaries | $35.6B | $36.4B | $36.7B | $39.6B | $40.8B | $43.3B | $48B | $47.5B |
| Debt Securities, Available-for-Sale, Unrealized Loss Position | $57.5B | $44.5B | $53.6B | $42.7B | $39.2B | $34.3B | $36.1B | $46.8B |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 10 | $32.1B | $32.5B | $32.8B | $32.7B | $32.4B | $33.6B | $34B | $34.4B |
| Total Liabilities | $26.5B | $27.5B | $28.4B | $28.1B | $29.3B | $31.3B | $31.5B | $31.2B |
| Policyholder Account Balance, Reinsurance Recoverable | $25.9B | $26B | $25.8B | $25.6B | $25.7B | $26.2B | $26.2B | $30.1B |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 10 | $24.8B | $26.8B | $25.4B | $26B | $26B | $27.9B | $28.2B | $28.2B |
| Less than 12 months | $14.5B | $6.2B | $19.8B | $16.6B | $15.1B | $10.6B | $13.8B | $26.2B |
| 12 months or more | $43B | $38.2B | $33.7B | $26.1B | $24.1B | $23.7B | $22.3B | $20.6B |
| Accrued Expenses and Other Liabilities | $12.7B | $14.2B | $13.6B | $15.6B | $17.2B | $18.3B | $17.7B | $19.2B |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | $7.3B | $8.1B | $9.4B | $10.8B | $12.6B | $15.3B | $15.3B | $13.8B |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year 5 Through 10 | $6.8B | $7.9B | $9.1B | $10.7B | $12.6B | $15.5B | $15.4B | $13.7B |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, after Year One Through Five | $13.9B | $13.2B | $12.6B | $11.4B | $11.9B | $12.1B | $12B | $11.7B |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, after Year One Through Five | $13.4B | $13.1B | $12.4B | $11.3B | $11.8B | $12B | $11.9B | $11.5B |
| Unfunded commitments | — | — | $11B | $10.8B | $10.5B | $10.4B | $10.5B | $9.1B |
| Additional Liability, Long-Duration Insurance, before Reinsurance, after Discount Rate Change | $7.4B | $7.5B | $7.6B | $7.7B | $7.8B | $7.9B | $8B | $8.1B |
| Debt Securities, Available-for-Sale, Accumulated Gross Unrealized Loss, before Tax | $9.9B | $7.7B | $9.3B | $7.7B | $7.5B | $6.8B | $6.8B | $7.2B |
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss | $9.9B | $7.7B | $9.3B | $7.7B | $7.5B | $6.8B | $6.8B | $7.2B |
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, 12 Months or Longer, Accumulated Loss | $9.6B | $7.5B | $8.7B | $7.3B | $7B | $6.5B | $6.4B | $6.5B |
| Balance, End of Period, Net of Reinsurance Recoverable and Impact of Unrealized Investment Gains and Losses | $5.8B | $5.9B | $5.9B | $6B | $6B | $6.1B | $6.2B | $6.2B |
| Carry Pool Reclassifications | $4B | $4.7B | $4.2B | $5B | $5.5B | $5.8B | $5.9B | $6.2B |
| Reinsurance Recoverable, Net Of Reinsurance Liabilities | $4.5B | $4.5B | $4.4B | $4.4B | $4.4B | $4.3B | $4.2B | $4.1B |
| Separate Account, Liability, Cash Surrender Value, Amount | $4.1B | $4.1B | $4B | $3.7B | $3.8B | $3.9B | $3.8B | $3.6B |
| Common stock, shares authorized (in shares) | 3.5B | 3.5B | 3.5B | 3.5B | 3.5B | 3.5B | 3.5B | 3.5B |
| Cost-of-reinsurance liabilities | $3B | $3.1B | $3.1B | $3.2B | $3.2B | $3.2B | $3.1B | $3.1B |
| Redeemable noncontrolling interests in subsidiaries | $1.3B | $1.3B | $1.6B | $1.9B | $2B | $2.4B | $2.7B | $2.8B |
| Funds withheld receivable at interest | $2.6B | $2.6B | $2.5B | $2.5B | $2.5B | $2.4B | $2.3B | $2.3B |
| Less: Reinsurance Recoverable, End of Period | $1.5B | $1.5B | $1.6B | $1.6B | $1.7B | $1.7B | $1.8B | $1.8B |
| Market Risk Benefit, after Increase (Decrease) from Instrument-Specific Credit Risk | $1B | $1.1B | $999.9M | $1.2B | $1.2B | $1.3B | $1.3B | $1.4B |
| Debt Securities, Available-for-Sale, With An Allowance For Credit Loss, Continuous Unrealized Loss Position, 12 Months or Longer | — | — | $2.2B | $1.9B | $1.8B | $1.6B | $1.4B | $1.3B |
| Fair Value Included Within Total Assets and Liabilities | $530.5M | $771.2M | $520.5M | $669.3M | $2B | $1.6B | $1.5B | $1.1B |
| Collateral held on our behalf by reinsurers | $1.2B | $1.2B | $1.1B | $1.1B | $1.1B | $1.1B | $1.1B | $1.1B |
| Liability for future policy benefits, fair value option | $1.2B | $1.2B | $1.2B | $1.2B | $1.2B | $1.2B | $1.1B | $1.1B |
| Common stock, shares issued (in shares) | 887.4M | 887.4M | 888.2M | 888.3M | 890.9M | 891M | 891.5M | 889.4M |
| Common Stock, Shares, Outstanding | 887.4M | 887.4M | 888.2M | 888.3M | 890.9M | 891M | 891.5M | 889.4M |
| Equity method investments (Note 11) | — | — | $834.4M | — | $878.8M | $852.6M | $873.6M | $850.1M |
| Fair Value Included Within Total Assets and Liabilities | $315.1M | $269.2M | $581.3M | $368.8M | $256.3M | $446.4M | $495.8M | $756.9M |
| Debt Securities, Available-for-Sale, Continuous Unrealized Loss Position, Less than 12 Months, Accumulated Loss | $374.5M | $196.2M | $647.3M | $445.1M | $517.1M | $330.6M | $356.6M | $748.4M |
| Repurchase agreements, notional value | $565M | $202.7M | $261.4M | $306.1M | $364.8M | $384.7M | $663.8M | $715.1M |
| Present value of future insurance profits, liability | $814.3M | $789.2M | $766.3M | $743M | $721.9M | $702M | $678.4M | $660M |
| Debt Securities, Available-for-Sale, Amortized Cost, Maturity, Allocated and Single Maturity Date, Year One | $1.3B | $1.5B | $1.3B | $1.1B | $1.3B | $1B | $803.4M | $603.4M |
| Debt Securities, Available-for-Sale, Fair Value, Maturity, Allocated and Single Maturity Date, Year One | $1.3B | $1.5B | $1.3B | $1.1B | $1.2B | $1B | $793.2M | $596.3M |
| Gross Unrealized Gains | $185.4M | $716.9M | $256M | $386.2M | $597.2M | $951.2M | $929.8M | $558.8M |
| Additional amount in share repurchase program | $500M | — | — | — | $500M | — | — | $500M |
| Available-for-sale securities, allowance for credit loss | $215.2M | $248.5M | $275.3M | $265.3M | $269.7M | $254.6M | $288.7M | $317.6M |
| Deferred Sale Inducement Cost | — | — | — | — | — | — | $149.9M | $151.6M |
| Fair value hedge adjustments on discontinued hedges | $19.6M | $16.9M | $193.3M | $183.1M | $172.7M | $163.6M | $154.6M | $145.8M |
| AFS fixed maturity securities in an unrealized loss position for 12 months or more, gross unrealized losses | — | — | $268.4M | $182M | $171.7M | $146.9M | $125.5M | -$123.4M |
| Cash surrender value | $96.1B | $99.6B | $102.8B | $104.8B | $106.6B | $108.8B | $110B | $109M |
| Net amount at risk | $116.4B | $114.9B | $113B | $111.3B | $109.8B | $107.9B | $106.1B | $104.5M |
| Remaining available amount, share repurchase program | $50M | — | — | — | — | — | — | $50M |
| Restricted cash held with open derivative transactions with exchange brokers | $175.2M | $174.7M | $135.7M | $93.7M | $48.5M | $45.2M | $49.9M | $42.9M |
| Valuation allowance for uncollectible reinsurance | $24.2M | $23.2M | $16.4M | $22.1M | $20.8M | $23.8M | $25.6M | $29.6M |
| Asset | $182K | $377K | $2.3M | $148K | $1.1M | $2.4M | $997K | $988K |
| Debt Securities, Available-for-Sale, Unrealized Loss Position, Number of Positions | 4808.00 | 4142.00 | 5966.00 | 5055.00 | 4605.00 | 4122.00 | 4294.00 | 5386.00 |
| Securities in unrealized loss position, with an allowance for credit loss | — | — | 3833.00 | 3127.00 | 3016.00 | 2931.00 | 2810.00 | 2700.00 |
| Number of counterparties | 6.00 | 6.00 | 6.00 | 6.00 | 6.00 | 6.00 | 6.00 | 6.00 |
| Percentage of Total | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% | 100.0% |
| Weighted average crediting rate | 3.3% | 3.5% | 3.6% | 3.6% | 3.7% | 3.8% | 3.8% | 3.9% |
| Weighted-Average Interest, Current Discount Rate | 3.3% | 3.3% | 3.3% | 3.3% | 3.3% | 3.3% | 3.3% | 3.3% |
| Common stock, par value (in dollars per share) | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 |
| Effect of Changes in Experience | — | — | -$64.8M | — | — | — | -$20.1M | — |
| Additional Liability, Long-Duration Insurance, Original Discount Rate, before Reinsurance, after Cash Flow Change | — | — | $7.6B | — | — | — | $8B | — |
| Concentration risk, revenues, number of reinsurance counterparties exceeding threshold | — | — | 100.0% | — | — | — | — | — |
| Assumed from Other Companies | — | — | $43.9B | — | — | — | $42B | — |
| SEC Schedule, 12-17, Insurance Companies, Reinsurance, Life Insurance in Force, Ceded | — | — | $57.4B | — | — | — | $47B | — |
| Gross Amount | — | — | $75.6B | — | — | — | $72.6B | — |
| Net Amount | — | — | $62.1B | — | — | — | $67.6B | — |
| Percentage of Amount Assumed to Net | — | — | 71.0% | — | — | — | 62.0% | — |
| Purchase Obligation | — | — | $167.4M | — | — | — | $122.5M | — |
| Purchase Obligation, Due in Fifth Year | — | — | $11.2M | — | — | — | $9.3M | — |
| 2029 | — | — | $12.5M | — | — | — | $10.5M | — |
| 2027 | — | — | $31.3M | — | — | — | $17.6M | — |
| 2028 | — | — | $21.8M | — | — | — | $12.3M | — |
| Cumulative income tax savings realized | — | — | $18.3M | — | — | — | $22.8M | — |
| Unrecognized tax benefits | — | — | $32.8M | — | — | — | $32.6M | — |
| Accrued income tax penalties liability | — | — | $2.3M | — | — | — | $2.6M | — |
| Interest accrued | — | — | $6.9M | — | — | — | $8.5M | — |
| Purchase Commitments - Due Next Year | — | — | $35.7M | — | — | — | $27.8M | — |
| Unrecorded Unconditional Purchase Obligation - Due After Year Five | — | — | $54.9M | — | — | — | $45.1M | — |
