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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, 2025
Jun. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Restructuring and Related Activities [Abstract]          
Labor contract ratification bonuses $ 0 $ 561 $ 0 $ 561 $ 0
(Gains) losses on sale of assets and other special charges (73)   (5) (295) 44
Total operating special charges (credits) (73)   (5) 266 44
Nonoperating unrealized losses on investments, net 13   90 8 160
Nonoperating debt extinguishment and modification fees 20   75 20 110
Total nonoperating special charges and unrealized losses on investments, net 33   165 28 270
Total operating and nonoperating special charges (credits) and unrealized losses on investments, net (40)   160 295 314
Income tax benefit, net of valuation allowance 0   (15) (127) (34)
Total operating and nonoperating special charges (credits) and unrealized losses on investments, net of income taxes $ (40)   $ 145 $ 168 $ 280