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Debt - Narrative 2023 (Details) - USD ($) $ in Millions |  | 1 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 25, 2023 | Nov. 30, 2024 | Dec. 31, 2023 | Mar. 31, 2024 | Dec. 31, 2024 | Oct. 04, 2023 | Sep. 30, 2023 | May 23, 2023
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt at face value |  |  | $ 18,413 |  | $ 24,085 |  |  |
Debt instrument, repurchased face amount | $ 1,133 |  |  |  | 3,768 |  |  |
Incurred debt discount | 33 |  |  |  |  |  |  |
Gain (loss) on repurchase of debt instrument | $ 27 |  |  |  |  |  |  |
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 |  |  |
Letter of Credit | Maximum |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, capacity available for specific purpose other than for trade purchases |  |  |  |  | 500 |  |  |
Surmont |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Interest acquired |  |  |  |  |  | 50.00% |  |
Variable Rate Debt Bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt at face value |  |  | 283 |  | $ 283 |  |  |
7.65% Debentures due 2023 | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Retirement of debt |  |  | $ 78 |  |  |  |  |
Stated interest rate |  |  | 7.65% |  |  |  |  |
10, 30, and 40 Year Senior Notes | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt at face value |  |  |  |  |  |  | $ 2,700 |
5.05% Note due 2033 | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 5.05% |
Debt at face value |  |  |  |  |  |  | $ 1,000 |
5.55% Note due 2054 | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 5.55% |
Debt at face value |  |  |  |  |  |  | $ 1,000 |
5.7% Note due 2063 | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  | 5.70% |
Debt at face value |  |  |  |  |  |  | $ 700 |
5.3% Note due 2053 | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  |  |  | 5.30%
Debt at face value |  |  |  |  |  |  |  | $ 1,100
2.125% Notes due 2024 | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Retirement of debt |  |  |  | $ 461 |  |  |  |
Stated interest rate | 2.125% |  |  | 2.125% | 2.125% |  |  |
Debt at face value | $ 900 |  |  |  |  |  |  |
Debt instrument, repurchased face amount | $ 439 |  |  |  |  |  |  |
3.35% Notes due 2024 | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Retirement of debt |  | $ 265 |  |  |  |  |  |
Stated interest rate | 3.35% | 3.35% |  |  | 3.35% |  |  |
Debt at face value | $ 426 |  |  |  |  |  |  |
Debt instrument, repurchased face amount | $ 160 |  |  |  |  |  |  |
2.4% Notes due 2025 | Notes Payable to Banks |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate | 2.40% |  |  |  | 2.40% |  |  |
Debt at face value | $ 900 |  |  |  |  |  |  |
Debt instrument, repurchased face amount | $ 534 |  |  |  |  |  |  |

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