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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Changes in AOCI by Component (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) $ 7,024 $ 8,468
Balance, end of period (in usd) 7,054 8,235
CTA    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) (3,430) (2,985)
Other comprehensive income (loss) before reclassifications (57) (180)
Amounts reclassified from AOCI 126 0
Net other comprehensive income (loss) 69 (180)
Balance, end of period (in usd) (3,361) (3,165)
Pension and OPEB plans    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) (475) (452)
Other comprehensive income (loss) before reclassifications 14 5
Amounts reclassified from AOCI (13) (1)
Net other comprehensive income (loss) 1 4
Balance, end of period (in usd) (474) (448)
Hedging activities    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) (108) (120)
Other comprehensive income (loss) before reclassifications 0 6
Amounts reclassified from AOCI (2) 2
Net other comprehensive income (loss) (2) 8
Balance, end of period (in usd) (110) (112)
Available-for-sale debt securities    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) 3 3
Other comprehensive income (loss) before reclassifications 0 0
Amounts reclassified from AOCI 0 0
Net other comprehensive income (loss) 0 0
Balance, end of period (in usd) 3 3
Total    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) (4,010) (3,554)
Other comprehensive income (loss) before reclassifications (43) (169)
Amounts reclassified from AOCI 111 1
Net other comprehensive income (loss) 68 (168)
Balance, end of period (in usd) $ (3,942) $ (3,722)