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Special Charges - Schedule of Components of Special Charges (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Operating:        
(Gains) losses on sale of assets and other special charges $ (5) $ 28 $ 44 $ 88
Labor contract ratification bonuses 0 1 0 814
Total operating special charges (5) 29 44 902
Nonoperating:        
Nonoperating unrealized (gains) losses on investments, net 90 54 160 (54)
Nonoperating debt extinguishment and modification fees 75 0 110 11
Total nonoperating special charges and unrealized (gains) losses on investments, net 165 54 270 (43)
Total operating and nonoperating special charges and unrealized (gains) losses on investments, net 160 83 314 859
Income tax benefit, net of valuation allowance (15) (7) (34) (204)
Total operating and nonoperating special charges and unrealized (gains) losses on investments, net of income taxes $ 145 $ 76 $ 280 $ 655