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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