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Special Charges - Narrative (Details) - USD ($) $ in Millions |  |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Jul. 02, 2024 | Feb. 22, 2024 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Special Charges [Line Items] |  |  |  |  |  |
(Gains) losses on sale of assets and other special charges |  |  | $ (5) | $ 28 | $ 44 | $ 88
Nonoperating unrealized (gains) losses on investments, net |  |  | 90 | 54 | 160 | (54)
Nonoperating debt extinguishment and modification fees |  |  | 75 | 0 | 110 | 11
Labor contract ratification bonuses |  |  | 0 | $ 1 | 0 | 814
Prepayment of outstanding principal amount |  |  |  |  | 8,792 | 3,423
Secured Debt | Term Loan Facility |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Nonoperating debt extinguishment and modification fees |  |  | $ 75 |  | 75 |
Prepayment of outstanding principal amount | $ 1,800 |  |  |  |  |
Secured Debt | Term Loan Due 2021 |  |  |  |  |  |
Special Charges [Line Items] |  |  |  |  |  |
Nonoperating debt extinguishment and modification fees |  |  |  |  |  | 11
Refinancing charges |  |  |  |  | $ 35 |
Prepayment of outstanding principal amount |  | $ 1,370 |  |  |  | $ 1,000

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