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Debt - Narrative 2024 (Details) - USD ($) $ in Millions | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2024 | Nov. 30, 2024 | Mar. 31, 2024 | Dec. 31, 2025 | Dec. 31, 2024 | Feb. 28, 2025 | Nov. 22, 2024
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | $ 24,085 |  |  | $ 23,347 | $ 24,085 |  |
Debt instrument, repurchased face amount | 3,768 |  |  |  | 3,768 |  |
Debt repurchase, premiums paid | 283 |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  | (173) |  |
Retirement of debt |  |  |  | 700 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Project finance facility, maximum borrowing capacity |  |  |  |  |  | $ 5,500 |
Minimum limit of debt for cross default provision |  |  |  | 200 |  |  |
Commercial paper program, amount outstanding |  |  |  | 0 |  |  |
Remaining borrowing capacity under revolving credit facility | 5,500 |  |  | 5,500 | 5,500 |  |
Letter of Credit | Maximum |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit facility, capacity available for specific purpose other than for trade purchases |  |  |  | 500 |  |  |
Variable Rate Debt Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | 283 |  |  | 283 | 283 |  |
Marathon Oil Corporation |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt |  | $ 4,700 |  |  |  |  | $ 4,719
Debt instrument, original amount of exchanged debt | 863 |  |  |  | 863 |  |
Debt instrument, exchange amount | 862 |  |  |  | 862 |  |
Marathon Oil Corporation | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value |  | 4,600 |  |  |  |  |
4.05% Revenue Refunding Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value |  | $ 200 |  |  |  |  |
Stated interest rate |  | 4.05% |  |  |  |  |
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 | Marathon Oil Corporation | Variable Rate Debt Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 4.05% |  |  |
4.4% Notes due 2027 | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 4.40% |  |  |
Debt instrument, exchange amount | 228 |  |  |  | 228 |  |
Long-term and short-term, combined amount, gross | $ 424 |  |  | $ 422 | $ 424 |  |
4.4% Notes due 2027 | Marathon Oil Corporation | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value |  | $ 1,000 |  |  |  |  |
Stated interest rate | 4.40% | 4.40% |  |  | 4.40% |  |
Debt instrument, repurchased face amount | $ 576 |  |  |  | $ 576 |  |
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 |  |  | $ 84 | 86 |  |
5.3% Notes due 2029 | Marathon Oil Corporation | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value |  | $ 600 |  |  |  |  |
Stated interest rate |  | 5.30% |  |  |  |  |
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 | $ 180 |  |
6.8% Notes due 2032 | Marathon Oil Corporation | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value |  | $ 550 |  |  |  |  |
Stated interest rate | 6.80% | 6.80% |  |  | 6.80% |  |
Debt instrument, repurchased face amount | $ 370 |  |  |  | $ 370 |  |
Debt instrument, exchange amount | 102 |  |  |  | 102 |  |
5.7% Notes due 2034 | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 5.70% |  |  |
Debt instrument, exchange amount | 63 |  |  |  | 63 |  |
Long-term and short-term, combined amount, gross | $ 103 |  |  | $ 103 | $ 103 |  |
5.7% Notes due 2034 | Marathon Oil Corporation | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value |  | $ 600 |  |  |  |  |
Stated interest rate | 5.70% | 5.70% |  |  | 5.70% |  |
Debt instrument, repurchased face amount | $ 497 |  |  |  | $ 497 |  |
6.6% Notes due 2037 | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 6.60% |  |  |
Debt instrument, exchange amount | 259 |  |  |  | 259 |  |
Long-term and short-term, combined amount, gross | $ 335 |  |  | $ 335 | $ 335 |  |
6.6% Notes due 2037 | Marathon Oil Corporation | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value |  | $ 750 |  |  |  |  |
Stated interest rate | 6.60% | 6.60% |  |  | 6.60% |  |
Debt instrument, repurchased face amount | $ 415 |  |  |  | $ 415 |  |
5.2% Notes due 2045 | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 5.20% |  |  |
Debt instrument, exchange amount | 151 |  |  |  | 151 |  |
Long-term and short-term, combined amount, gross | $ 186 |  |  | $ 186 | $ 186 |  |
5.2% Notes due 2045 | Marathon Oil Corporation | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value |  | $ 500 |  |  |  |  |
Stated interest rate | 5.20% | 5.20% |  |  | 5.20% |  |
Debt instrument, repurchased face amount | $ 314 |  |  |  | $ 314 |  |
2.20% Revenue Refunding Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value |  | $ 200 |  |  |  |  |
Stated interest rate |  | 2.20% |  |  |  |  |
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 | Marathon Oil Corporation | Variable Rate Debt Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.20% |  |  |
2.375% Revenue Refunding Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value |  | $ 200 |  |  |  |  |
Stated interest rate |  | 2.375% |  |  |  |  |
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 | Marathon Oil Corporation | Variable Rate Debt Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  |  | 2.375% |  |  |
5.3% Note due 2029 | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, exchange amount | $ 59 |  |  |  | $ 59 |  |
5.3% Note due 2029 | Marathon Oil Corporation | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate | 5.30% |  |  |  | 5.30% |  |
Debt instrument, repurchased face amount | $ 514 |  |  |  | $ 514 |  |
7.8% Debentures due 2027 | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | $ 203 |  |  |  | $ 203 |  |
Stated interest rate | 7.80% |  |  |  | 7.80% |  |
Debt instrument, repurchased face amount | $ 83 |  |  |  | $ 83 |  |
7.0% Debentures due 2029 | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | $ 112 |  |  |  | $ 112 |  |
Stated interest rate | 7.00% |  |  |  | 7.00% |  |
Debt instrument, repurchased face amount | $ 17 |  |  |  | $ 17 |  |
7.375% Debentures due 2029 | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | $ 92 |  |  |  | $ 92 |  |
Stated interest rate | 7.375% |  |  |  | 7.375% |  |
Debt instrument, repurchased face amount | $ 26 |  |  |  | $ 26 |  |
6.95% Notes due 2029 | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | $ 1,195 |  |  |  | $ 1,195 |  |
Stated interest rate | 6.95% |  |  | 6.95% | 6.95% |  |
Debt instrument, repurchased face amount | $ 490 |  |  |  | $ 490 |  |
Long-term and short-term, combined amount, gross | 705 |  |  | $ 705 | 705 |  |
8.125% Notes due 2030 | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | $ 390 |  |  |  | $ 390 |  |
Stated interest rate | 8.125% |  |  | 8.125% | 8.125% |  |
Debt instrument, repurchased face amount | $ 183 |  |  |  | $ 183 |  |
Long-term and short-term, combined amount, gross | 207 |  |  | $ 207 | 207 |  |
7.4% Notes due 2031 | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | $ 382 |  |  |  | $ 382 |  |
Stated interest rate | 7.40% |  |  | 7.40% | 7.40% |  |
Debt instrument, repurchased face amount | $ 151 |  |  |  | $ 151 |  |
Long-term and short-term, combined amount, gross | 232 |  |  | $ 232 | 232 |  |
7.25% Notes due 2031 | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | $ 400 |  |  |  | $ 400 |  |
Stated interest rate | 7.25% |  |  | 7.25% | 7.25% |  |
Debt instrument, repurchased face amount | $ 132 |  |  |  | $ 132 |  |
Long-term and short-term, combined amount, gross | 268 |  |  | $ 268 | 268 |  |
Universal Shelf Registration Notes | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | 5,200 |  |  |  | 5,200 |  |
Notes Payable to Banks | 4.7% Notes due 2030 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | $ 1,350 |  |  |  | $ 1,350 |  |
Stated interest rate | 4.70% |  |  |  | 4.70% |  |
Notes Payable to Banks | 4.85% Notes due 2032 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | $ 650 |  |  |  | $ 650 |  |
Stated interest rate | 4.85% |  |  |  | 4.85% |  |
Notes Payable to Banks | 5.0% Notes due 2035 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | $ 1,250 |  |  |  | $ 1,250 |  |
Stated interest rate | 5.00% |  |  |  | 5.00% |  |
Notes Payable to Banks | 5.5% Notes due 2055 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | $ 1,300 |  |  |  | $ 1,300 |  |
Stated interest rate | 5.50% |  |  |  | 5.50% |  |
Notes Payable to Banks | 5.65% Notes due 2065 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt at face value | $ 650 |  |  |  | $ 650 |  |
Stated interest rate | 5.65% |  |  |  | 5.65% |  |
Sub-Series 2017C | Variable Rate Debt Bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate | 3.30% |  |  |  | 3.30% |  |
Long-term and short-term, combined amount, gross | $ 400 |  |  |  | $ 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 | $ 1,000 |  |
3.35% Notes due 2024 [Member] | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  | 3.35% |  |  |  |  |
Retirement of debt |  | $ 265 |  |  |  |  |
2.125% Note due 2024 [Member] | Notes Payable to Banks |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Stated interest rate |  |  | 2.125% |  |  |  |
Retirement of debt |  |  | $ 461 |  |  |  |

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