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Debt - Schedule of Debt (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Nov. 30, 2024 | Nov. 22, 2024 | Mar. 31, 2024 | Dec. 31, 2023 | May 25, 2023
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Debt Instrument [Line Items] |  |  |  |  |  |
Finance leases | $ 940 |  |  |  | $ 1,129 |
Net unamortized premiums, discounts and debt issuance costs | (701) |  |  |  | (605) |
Total debt | 24,324 |  |  |  | 18,937 |
Short-term debt | (1,035) |  |  |  | (1,074) |
Long-term debt | 23,289 |  |  |  | 17,863 |
Debt at face value | 24,085 |  |  |  | 18,413 |
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 |
2.125% Notes due 2024 | Notes Payable to Banks |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 2.125% |  |  | 2.125% |  | 2.125%
Long-term and short-term, combined amount, gross | $ 0 |  |  |  | 461 |
Debt at face value |  |  |  |  |  | $ 900
3.35% Notes due 2024 | Notes Payable to Banks |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 3.35% | 3.35% |  |  |  | 3.35%
Long-term and short-term, combined amount, gross | $ 0 |  |  |  | 265 |
Debt at face value |  |  |  |  |  | $ 426
2.4% Notes due 2025 | Notes Payable to Banks |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 2.40% |  |  |  |  | 2.40%
Long-term and short-term, combined amount, gross | $ 366 |  |  |  | 366 |
Debt at face value |  |  |  |  |  | $ 900
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 | $ 134 |  |  |  | 134 |
3.35% Notes due 2025 | Debentures |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 3.35% |  |  |  |  |
Long-term and short-term, combined amount, gross | $ 199 |  |  |  | 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 |  |  |  | $ 203 |
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 | $ 424 |  |  |  | $ 0 |
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 |  |  |  | 92 |
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 |  |  |  | $ 112 |
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 | $ 86 |  |  |  | $ 0 |
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% |  |  |  |  |
Long-term and short-term, combined amount, gross | $ 705 |  |  |  | 1,195 |
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 |  |  |  | 0 |
8.125% Notes due 2030 | Notes Payable to Banks |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 8.125% |  |  |  |  |
Long-term and short-term, combined amount, gross | $ 207 |  |  |  | 390 |
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% |  |  |  |  |
Long-term and short-term, combined amount, gross | $ 268 |  |  |  | 400 |
Debt at face value | $ 400 |  |  |  |  |
7.4% Notes due 2031 | Notes Payable to Banks |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 7.40% |  |  |  |  |
Long-term and short-term, combined amount, gross | $ 232 |  |  |  | 382 |
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 |  |  |  | $ 0 |
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 |  |  |  | $ 0 |
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 |
5.70% 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 |  |  |  | $ 0 |
5.70% 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 |
5.00% 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 |  |  |  | 0 |
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 | $ 573 |  |  |  | $ 603 |
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 |  |  |  | $ 0 |
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 |
5.20% 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 |  |  |  | $ 0 |
5.20% 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 |
5.500% 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 |  |  |  | 0 |
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 |
5.70% 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 |  |  |  | 0 |
Marine Terminal Revenue Refunding Bonds due 2031 at 1.78% – 4.80% during 2024 and 1.65% – 4.70% during 2023 | 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 1.78% – 4.80% during 2024 and 1.65% – 4.70% during 2023 | Variable Rate Debt Bonds | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 1.78% |  |  |  | 1.65% |
Marine Terminal Revenue Refunding Bonds due 2031 at 1.78% – 4.80% during 2024 and 1.65% – 4.70% during 2023 | Variable Rate Debt Bonds | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 4.80% |  |  |  | 4.70% |
Industrial Development Bonds due 2035 at 1.78% – 4.22% during 2024 and 1.85% – 4.70% during 2023 | Variable Rate Debt Bonds |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term and short-term, combined amount, gross | $ 18 |  |  |  | $ 18 |
Industrial Development Bonds due 2035 at 1.78% – 4.22% during 2024 and 1.85% – 4.70% during 2023 | Variable Rate Debt Bonds | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 1.78% |  |  |  | 1.85% |
Industrial Development Bonds due 2035 at 1.78% – 4.22% during 2024 and 1.85% – 4.70% during 2023 | Variable Rate Debt Bonds | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Stated interest rate | 4.22% |  |  |  | 4.70% |
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 |  |  |  | $ 0 |
Other |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term and short-term, combined amount, gross | $ 16 |  |  |  | $ 21 |

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