| Financial And Nonfinancial Liability, Fair Value, Amount Offset Against Collateral | $19.7B | $19.7B | $19.7B | $18.5B | $20.8B | $21.5B | $19.4B | $27.4B |
| Derivative Asset, Subject to Master Netting Arrangement, Liability Offset | $3.2B | $5.6B | $2.1B | $3.1B | $4.7B | $2.4B | $2.7B | $25.4B |
| Derivative Liability, Subject to Master Netting Arrangement, Asset Offset | $3.2B | $5.6B | $2.1B | $3.1B | $4.7B | $2.4B | $2.7B | $25.4B |
| Long-Term Debt and Lease Obligation | $17.2B | $18.5B | $18.2B | $17.7B | $17.2B | $19.2B | $18.7B | $18.7B |
| Estimated excess of current replacement cost over LIFO cost of inventories | $5.9B | $4.5B | $4.9B | $5.4B | $4.5B | $4.5B | $3.6B | $10.5B |
| Accounts receivable | $8.9B | $8.5B | $8.6B | $8B | $9B | $8.6B | $7.8B | $9.3B |
| Short-term debt and current portion of long-term debt | $2.8B | $1.5B | $1.8B | $1.1B | $3.7B | $2.6B | $1B | $8.4B |
| Deferred income taxes | $7.2B | $7.3B | $7.1B | $7B | $7B | $7B | $7.3B | $7.4B |
| Energy Related Inventory, Crude Oil, Products and Merchandise | $6.1B | $5.6B | $3.5B | $4.8B | $5.1B | $5.9B | $4.5B | $6.1B |
| LIFO Inventory Amount | $5.9B | $5.5B | $3.4B | $4.7B | $5.1B | $5.9B | $4.5B | $6.1B |
| Cash and cash equivalents, end of period | $2.4B | $1.6B | $1.7B | $1.5B | $1.1B | $2B | $1.1B | $5.2B |
| Common stock, shares authorized (in shares) | 2.5B | 2.5B | 2.5B | 2.5B | 2.5B | 2.5B | 2.5B | 2.5B |
| Derivative Liability, Subject to Master Netting Arrangement, Collateral, Right to Reclaim Cash Offset | $112M | $106M | $62M | $121M | $70M | $31M | $20M | $1.5B |
| Noncontrolling interests in subsidiaries | $1.1B | $1.1B | $1.1B | $1.1B | $1.1B | $1.2B | $1.1B | $1.2B |
| Asset, Fair Value Amount Offset Against Collateral | $272M | $362M | $355M | $268M | $376M | $414M | $304M | $827M |
| Remaining performance obligations related to customer contracts that are unsatisfied or partially unsatisfied | $394M | $341M | $566M | $579M | $927M | $894M | $854M | $819M |
| Difference in Carrying Value and Fair Value | $918M | $265M | $1B | $890M | $915M | $551M | $621M | $800M |
| Common stock, shares issued (in shares) | 656.5M | 656.9M | 657M | 658.2M | 658.3M | 659.1M | 659.4M | 660.9M |
| Accrual for Environmental Loss Contingencies | $448M | $439M | $439M | $435M | $453M | $521M | $506M | $487M |
| Derecognized Assets Securitized Or Assetbacked Financing Arrangement Assets And Any Other Financial Assets Managed Together Principal Amount Outstanding | — | — | — | — | — | — | $195M | $292M |
| Treasury stock, shares (in shares) | 238M | 243.9M | 248.6M | 250.6M | 254.1M | 256.2M | 258.3M | 260M |
| Contract with Customer, Liability | $162M | $183M | $232M | $203M | $208M | $215M | $198M | $210M |
| Allowance for doubtful accounts | $73M | $77M | $70M | $70M | $70M | $73M | $68M | $66M |
| Aggregate Available | — | — | — | — | — | — | — | 9K |
| Accounts and notes receivable, percent outstanding less than 60 days | 95.0% | 95.0% | 95.0% | 95.0% | 95.0% | 95.0% | 95.0% | 95.0% |
| Percentage of derivative contract volume expiring within twelve months | 90.0% | 90.0% | 90.0% | 90.0% | 90.0% | 90.0% | 90.0% | 90.0% |
| Common stock, par value (in dollars per share) | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 | $0.01 |
| Asset Retirement Obligation | — | — | $771M | — | — | — | $721M | — |
| Asset Retirement Obligation And Accrual For Environmental Loss Contingencies, Current | — | — | $81M | — | — | — | $205M | — |
| Long-term asset retirement obligations and accrued environmental costs | — | — | $1.1B | — | — | — | $1B | — |
| Asset Retirement Obligation And Accrual For Environmental Loss Contingencies | — | — | $1.2B | — | — | — | $1.2B | — |
| Deferred Tax Liabilities, Gross | — | — | $8.2B | — | — | — | $8.4B | — |
| Deferred Tax Assets, Gross | — | — | $1.3B | — | — | — | $1.3B | — |
| Deferred Tax Assets, Net of Valuation Allowance | — | — | $1.2B | — | — | — | $1.1B | — |
| Loss and credit carryforwards | — | — | $162M | — | — | — | $209M | — |
| Compensation and benefits | — | — | $355M | — | — | — | $296M | — |
| Allowance for unfunded lending related commitments | — | — | $91M | — | — | — | $72M | — |
| Asset retirement obligations and accrued environmental costs | — | — | $299M | — | — | — | $422M | — |
| Deferred Tax Assets, Valuation Allowance | — | — | $137M | — | — | — | $160M | — |
| Deferred Tax Liabilities, Net | — | — | $7B | — | — | — | $7.3B | — |
| Equity investments | — | — | $1.9B | — | — | — | $1.1B | — |
| Investment in subsidiaries | — | — | $2.5B | — | — | — | $3.2B | — |
| Deferred Tax Liabilities, Other | — | — | $318M | — | — | — | $342M | — |
| Properties, plants and equipment, and intangibles | — | — | $3.5B | — | — | — | $3.7B | — |
| Deferred tax liabilities not recognized to unremitted earnings indefinitely reinvested | — | — | $1.7B | — | — | — | $1.8B | — |
| Defined benefit plan, amortization percentage | — | — | 10.0% | — | — | — | 10.0% | — |
| Less: Fair value of plan assets at end of period | — | — | $190M | — | — | — | $235M | — |
| Difference in Carrying Value and Fair Value | $0 | $0 | $0 | $0 | $0 | $0 | $0 | $0 |
| Securities Collateral Held /Pledged Under Master Netting Agreements | $0 | $6M | $0 | $0 | $0 | $1M | $0 | $0 |
| Equity method investments (Note 11) | — | — | $14B | — | — | — | $11.4B | — |
| 2027 | — | — | $44M | — | — | — | $49M | — |
| Finite-Lived Intangible Assets, Accumulated Amortization | — | — | $408M | — | — | — | $462M | — |
| Estimated future amortization expense (less than) | — | — | $50M | — | — | — | $50M | — |
| Trademarks | — | — | $612M | — | — | — | $527M | — |
| Loans and long-term receivables | — | — | $174M | — | — | — | $303M | — |
| 2028 | — | — | $1.6B | — | — | — | $1.3B | — |
| 2029 | — | — | $1.3B | — | — | — | $1.3B | — |
| 2029 | — | — | $1.2B | — | — | — | $1.2B | — |
| 2030 | — | — | $1.3B | — | — | — | $1.2B | — |
| Long-Lived Assets | — | — | $49.6B | — | — | — | $51B | — |
| Prepaid expenses and other current assets | — | — | $20M | — | — | — | $0 | — |
| Other assets | — | — | $1.3B | — | — | — | $1.8B | — |
| Preferred Stock, Par or Stated Value Per Share | — | — | $0.01 | — | — | — | $0.01 | — |
| Preferred Stock, Shares Authorized | — | — | 500M | — | — | — | 500M | — |
| Preferred Stock, Shares Outstanding | — | — | 0 | — | — | — | 0 | — |
| Retained earnings related to undistributed earnings of affiliated companies | — | — | $3.7B | — | — | — | $3.7B | — |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Weighted Average Exercise Price | — | — | $88.93 | — | — | — | $89.89 | — |
| Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Weighted Average Exercise Price | — | — | $87.62 | — | — | — | $89.12 | — |
| Vested | — | — | — | — | — | — | $109M | — |
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number | — | — | 4.1M | — | — | — | 2.8M | — |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number | — | — | 3.9M | — | — | — | 2.8M | — |
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price | — | — | $89.32 | — | — | — | $90.11 | — |
| Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Exercisable Number | — | — | 3.2M | — | — | — | 2.6M | — |
| Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value | — | — | — | — | — | — | $103M | — |
| Software obligations | — | — | $17M | — | — | — | $34M | — |
| Unrecognized tax benefits | — | — | $88M | — | — | — | $88M | — |
| Penalties and interest accrued on unrecognized tax benefits | — | — | $1M | — | — | — | $1M | — |
| Amount that if recognized, would affect the effective tax rate or regulatory liability | — | — | $87M | — | — | — | $87M | — |
| Unrecorded Unconditional Purchase Obligation, to be Paid, Year Two | — | — | $315M | — | — | — | $315M | — |
| 2025 | — | — | $315M | — | — | — | $315M | — |
| Unrecorded Unconditional Purchase Obligation, to be Paid, Year Four | — | — | $315M | — | — | — | $315M | — |
| Purchase commitments, Due in 2027 | — | — | $315M | — | — | — | $315M | — |
| Unrecorded Unconditional Purchase Obligation, to be Paid, Year Three | — | — | $315M | — | — | — | $315M | — |
| Unrecorded Unconditional Purchase Obligation - Due After Year Five | — | — | $369M | — | — | — | $54M | — |