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SPECIAL CHARGES (CREDITS) - Schedule of Components of Special Charges (Credits) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Restructuring and Related Activities [Abstract]        
Labor contract ratification bonuses $ (2) $ 0 $ 182 $ 561
(Gains) losses on sale of assets and other special charges (213) (73) (931) (295)
Total operating special charges (credits) (215) (73) (749) 266
Nonoperating unrealized (gains) losses on investments, net 13 13 (13) 8
Nonoperating debt extinguishment and modification fees 0 20 6 20
Total nonoperating special charges and unrealized (gains) losses on investments, net 13 33 (8) 28
Total operating and nonoperating special charges (credits) and unrealized (gains) losses on investments, net (202) (40) (757) 295
Income tax expense (benefit), net of valuation allowance 6 0 95 (127)
Total operating and nonoperating special charges (credits) and unrealized (gains) losses on investments, net of income taxes $ (197) $ (40) $ (662) $ 168