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Special Charges - Schedule of Components of Special Charges (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Operating:    
(Gains) losses on sale of assets and other special charges $ 13 $ 14
Total operating special charges 13 14
Nonoperating:    
Nonoperating unrealized (gains) losses on investments, net 37 (24)
Nonoperating debt extinguishment and modification fees 35 0
Total nonoperating special charges and unrealized (gains) losses on investments, net 72 (24)
Total operating and nonoperating special charges and unrealized (gains) losses on investments, net 85 (10)
Income tax benefit, net of valuation allowance (11) (3)
Total operating and nonoperating special charges and unrealized (gains) losses on investments, net of income taxes $ 74 $ (13)