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Income Taxes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2014
Income Taxes [Abstract] |  |  |  |
Statutory tax rate - United Kingdom | 25.00% | 25.00% | 24.00% |
Valuation allowance, increase (decrease) | $ 89 | $ 91 |  |
Deferred foreign income tax expense (benefit) | 12 | $ 110 | $ 330 |
Undistributed earnings from foreign subsidiaries subject to withholding tax if distributed | $ 720 |  |  |
Positive Outcome of Litigation | Settled Litigation | Anadarko Litigation |  |  |  |
Income Taxes [Abstract] |  |  |  |
Settlement amount paid |  |  |  | $ 5,200
Additional deferred tax assets |  |  |  | $ 2,000
United Kingdom |  |  |  |
Income Taxes [Abstract] |  |  |  |
Statutory tax rate - United Kingdom | 25.00% | 25.00% | 25.00% |
Valuation allowance, increase (decrease) | $ 11 | $ 5 |  |
Brazil |  |  |  |
Income Taxes [Abstract] |  |  |  |
Valuation allowance, increase (decrease) | 3 | 15 |  |
Deferred foreign income tax expense (benefit) |  | 16 |  |
The Netherlands |  |  |  |
Income Taxes [Abstract] |  |  |  |
Valuation allowance, increase (decrease) | $ 47 | 32 |  |
Deferred foreign income tax expense (benefit) |  | $ 33 |  |
Weighted Average | United Kingdom |  |  |  |
Income Taxes [Abstract] |  |  |  |
Statutory tax rate - United Kingdom |  |  | 23.50% |

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