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Debt - Schedule of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Nov. 30, 2024
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Finance leases | $ 801 | $ 940 |
Net unamortized premiums, discounts and debt issuance costs | (704) | (701) |
Total debt | 23,444 | 24,324 |
Short-term debt | (1,020) | (1,035) |
Long-term debt | 22,424 | 23,289 |
Debt at face value | 23,347 | 24,085 |
Notes Payable to Banks | Marathon Oil Corporation |  |  |
Debt Instrument [Line Items] |  |  |
Debt at face value |  |  | $ 4,600
Variable Rate Debt Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Debt at face value | $ 283 | 283 |
2.4% Notes due 2025 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 2.40% |  |
Long-term and short-term, combined amount, gross | $ 0 | 366 |
8.2% Debentures due 2025 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 8.20% |  |
Long-term and short-term, combined amount, gross | $ 0 | 134 |
3.35% Notes due 2025 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 3.35% |  |
3.35% Notes due 2025 | Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 3.35% |  |
Long-term and short-term, combined amount, gross | $ 0 | 199 |
6.875% Debentures due 2026 | Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.875% |  |
Long-term and short-term, combined amount, gross | $ 67 | $ 67 |
7.8% Debentures due 2027 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 7.80% |
Debt at face value |  | $ 203 |
7.8% Debentures due 2027 | Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 7.80% |  |
Long-term and short-term, combined amount, gross | $ 120 | 120 |
4.4% Notes due 2027 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.40% |  |
Long-term and short-term, combined amount, gross | $ 422 | $ 424 |
4.4% Notes due 2027 | Notes Payable to Banks | Marathon Oil Corporation |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 4.40% | 4.40%
Debt at face value |  |  | $ 1,000
3.75% Notes due 2027 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 3.75% |  |
Long-term and short-term, combined amount, gross | $ 196 | $ 196 |
4.3% Notes due 2028 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.30% |  |
Long-term and short-term, combined amount, gross | $ 223 | $ 223 |
7.375% Debentures due 2029 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 7.375% |
Debt at face value |  | $ 92 |
7.375% Debentures due 2029 | Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 7.375% |  |
Long-term and short-term, combined amount, gross | $ 66 | $ 66 |
7.0% Debentures due 2029 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 7.00% |
Debt at face value |  | $ 112 |
7.0% Debentures due 2029 | Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 7.00% |  |
Long-term and short-term, combined amount, gross | $ 95 | 95 |
5.3% Notes due 2029 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.30% |  |
Long-term and short-term, combined amount, gross | $ 84 | $ 86 |
5.3% Notes due 2029 | Notes Payable to Banks | Marathon Oil Corporation |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  |  | 5.30%
Debt at face value |  |  | $ 600
6.95% Notes due 2029 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.95% | 6.95% |
Long-term and short-term, combined amount, gross | $ 705 | $ 705 |
Debt at face value |  | 1,195 |
4.7% Notes due 2030 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.70% |  |
Long-term and short-term, combined amount, gross | $ 1,350 | $ 1,350 |
8.125% Notes due 2030 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 8.125% | 8.125% |
Long-term and short-term, combined amount, gross | $ 207 | $ 207 |
Debt at face value |  | 390 |
2.4% Notes due 2031 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 2.40% |  |
Long-term and short-term, combined amount, gross | $ 227 | 227 |
7.2% Notes due 2031 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 7.20% |  |
Long-term and short-term, combined amount, gross | $ 447 | $ 447 |
7.25% Notes due 2031 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 7.25% | 7.25% |
Long-term and short-term, combined amount, gross | $ 268 | $ 268 |
Debt at face value |  | $ 400 |
7.4% Notes due 2031 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 7.40% | 7.40% |
Long-term and short-term, combined amount, gross | $ 232 | $ 232 |
Debt at face value |  | 382 |
4.85% Notes due 2032 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.85% |  |
Long-term and short-term, combined amount, gross | $ 650 | 650 |
6.8% Notes due 2032 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.80% |  |
Long-term and short-term, combined amount, gross | $ 180 | $ 180 |
6.8% Notes due 2032 | Notes Payable to Banks | Marathon Oil Corporation |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 6.80% | 6.80%
Debt at face value |  |  | $ 550
5.9% Notes due 2032 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.90% |  |
Long-term and short-term, combined amount, gross | $ 505 | $ 505 |
5.05% Notes due 2033 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.05% |  |
Long-term and short-term, combined amount, gross | $ 1,000 | 1,000 |
5.7% Notes due 2034 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.70% |  |
Long-term and short-term, combined amount, gross | $ 103 | $ 103 |
5.7% Notes due 2034 | Notes Payable to Banks | Marathon Oil Corporation |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 5.70% | 5.70%
Debt at face value |  |  | $ 600
4.15% Notes due 2034 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.15% |  |
Long-term and short-term, combined amount, gross | $ 246 | $ 246 |
5.0% Notes due 2035 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.00% |  |
Long-term and short-term, combined amount, gross | $ 1,250 | 1,250 |
5.95% Notes due 2036 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.95% |  |
Long-term and short-term, combined amount, gross | $ 326 | 326 |
5.951% Notes serially maturing 2022 through 2037 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.951% |  |
Long-term and short-term, combined amount, gross | $ 541 | 573 |
6.6% Notes due 2037 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.60% |  |
Long-term and short-term, combined amount, gross | $ 335 | $ 335 |
6.6% Notes due 2037 | Notes Payable to Banks | Marathon Oil Corporation |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 6.60% | 6.60%
Debt at face value |  |  | $ 750
5.9% Notes due 2038 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.90% |  |
Long-term and short-term, combined amount, gross | $ 350 | $ 350 |
6.5% Notes due 2039 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 6.50% |  |
Long-term and short-term, combined amount, gross | $ 1,588 | 1,588 |
3.758% Notes due 2042 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 3.758% |  |
Long-term and short-term, combined amount, gross | $ 785 | 785 |
4.3% Notes due 2044 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.30% |  |
Long-term and short-term, combined amount, gross | $ 750 | 750 |
5.2% Notes due 2045 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.20% |  |
Long-term and short-term, combined amount, gross | $ 186 | $ 186 |
5.2% Notes due 2045 | Notes Payable to Banks | Marathon Oil Corporation |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 5.20% | 5.20%
Debt at face value |  |  | $ 500
5.95% Notes due 2046 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.95% |  |
Long-term and short-term, combined amount, gross | $ 329 | $ 329 |
7.9% Debentures due 2047 | Debentures |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 7.90% |  |
Long-term and short-term, combined amount, gross | $ 60 | 60 |
4.875% Notes due 2047 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.875% |  |
Long-term and short-term, combined amount, gross | $ 319 | 319 |
4.85% Notes due 2048 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.85% |  |
Long-term and short-term, combined amount, gross | $ 219 | 219 |
3.8% Notes due 2052 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 3.80% |  |
Long-term and short-term, combined amount, gross | $ 1,100 | 1,100 |
5.3% Notes due 2053 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.30% |  |
Long-term and short-term, combined amount, gross | $ 1,100 | 1,100 |
5.55% Notes due 2054 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.55% |  |
Long-term and short-term, combined amount, gross | $ 1,000 | 1,000 |
5.5% Notes due 2055 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.50% |  |
Long-term and short-term, combined amount, gross | $ 1,300 | 1,300 |
4.025% Notes due 2062 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.025% |  |
Long-term and short-term, combined amount, gross | $ 1,770 | 1,770 |
5.7% Notes due 2063 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.70% |  |
Long-term and short-term, combined amount, gross | $ 700 | 700 |
5.65% Notes due 2065 | Notes Payable to Banks |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.65% |  |
Long-term and short-term, combined amount, gross | $ 650 | 650 |
Marine Terminal Revenue Refunding Bonds due 2031 at 1.23% – 5.05% during 2025 and 1.78% – 4.80% during 2024 | Variable Rate Debt Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Long-term and short-term, combined amount, gross | $ 265 | $ 265 |
Marine Terminal Revenue Refunding Bonds due 2031 at 1.23% – 5.05% during 2025 and 1.78% – 4.80% during 2024 | Variable Rate Debt Bonds | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 1.23% | 1.78% |
Marine Terminal Revenue Refunding Bonds due 2031 at 1.23% – 5.05% during 2025 and 1.78% – 4.80% during 2024 | Variable Rate Debt Bonds | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.05% | 4.80% |
Industrial Development Bonds due 2035 at 1.23% – 5.05% during 2025 and 1.78% – 4.22% during 2024 | Variable Rate Debt Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Long-term and short-term, combined amount, gross | $ 18 | $ 18 |
Industrial Development Bonds due 2035 at 1.23% – 5.05% during 2025 and 1.78% – 4.22% during 2024 | Variable Rate Debt Bonds | Minimum |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 1.23% | 1.78% |
Industrial Development Bonds due 2035 at 1.23% – 5.05% during 2025 and 1.78% – 4.22% during 2024 | Variable Rate Debt Bonds | Maximum |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 5.05% | 4.22% |
2.20% Revenue Refunding Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  |  | 2.20%
Debt at face value |  |  | $ 200
2.20% Revenue Refunding Bonds | Variable Rate Debt Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Long-term and short-term, combined amount, gross | $ 200 |  |
2.20% Revenue Refunding Bonds | Variable Rate Debt Bonds | Marathon Oil Corporation |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 2.20% |  |
2.375% Revenue Refunding Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  |  | 2.375%
Debt at face value |  |  | $ 200
2.375% Revenue Refunding Bonds | Variable Rate Debt Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Long-term and short-term, combined amount, gross | $ 200 |  |
2.375% Revenue Refunding Bonds | Variable Rate Debt Bonds | Marathon Oil Corporation |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 2.375% |  |
4.05% Revenue Refunding Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  |  | 4.05%
Debt at face value |  |  | $ 200
4.05% Revenue Refunding Bonds | Variable Rate Debt Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Long-term and short-term, combined amount, gross | $ 200 |  |
4.05% Revenue Refunding Bonds | Variable Rate Debt Bonds | Marathon Oil Corporation |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.05% |  |
3.30% Revenue Refunding Bonds | Variable Rate Debt Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 3.30% |  |
Long-term and short-term, combined amount, gross | $ 400 |  |
Revenue Refunding Bonds Due 2037 | Variable Rate Debt Bonds |  |  |
Debt Instrument [Line Items] |  |  |
Long-term and short-term, combined amount, gross | 1,000 | $ 1,000 |
Other |  |  |
Debt Instrument [Line Items] |  |  |
Long-term and short-term, combined amount, gross | $ 13 | $ 16 |

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