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Special Charges - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Feb. 22, 2024 | Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Special Charges [Line Items] |  |  |  |  |
(Gains) losses on sale of assets and other special charges |  | $ 36 | $ 46 | $ 49 | $ 60
Nonoperating unrealized (gains) losses |  | 33 | (84) | 70 | (108)
Deferred debt issuance cost, writeoff |  |  |  | 35 |
Labor contract ratification bonuses |  | 0 | 813 | 0 | 813
Nonoperating debt extinguishment and modification fees |  | $ 0 | 11 | 35 | 11
Prepayment of outstanding principal amount |  |  |  | $ 6,217 | 2,614
Secured Debt | Term Loan Due 2021 |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |
Prepayment of outstanding principal amount | $ 1,370 |  | $ 1,000 |  | $ 1,000

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