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Special Charges - Schedule of Components of Special Charges (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Operating:        
(Gains) losses on sale of assets and other special charges $ 36 $ 46 $ 49 $ 60
Labor contract ratification bonuses 0 813 0 813
Total operating special charges 36 859 49 873
Nonoperating:        
Nonoperating unrealized (gains) losses on investments, net 33 (84) 70 (108)
Nonoperating debt extinguishment and modification fees 0 11 35 11
Total nonoperating special charges and unrealized (gains) losses on investments, net 33 (73) 105 (97)
Total operating and nonoperating special charges and unrealized (gains) losses on investments, net 69 786 154 776
Income tax benefit, net of valuation allowance (8) (194) (19) (197)
Total operating and nonoperating special charges and unrealized (gains) losses on investments, net of income taxes $ 61 $ 592 $ 135 $ 579