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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Changes in AOCI by Component (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) $ 8,468 $ 5,895
Other comprehensive income (loss) before reclassifications (274) 29
Amounts reclassified from AOCI 0 (10)
Net other comprehensive income (loss) (274) 19
Balance, end of period (in usd) 7,708 5,631
CTA    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) (2,985) (3,386)
Other comprehensive income (loss) before reclassifications (288) 25
Amounts reclassified from AOCI 0 0
Net other comprehensive income (loss) (288) 25
Balance, end of period (in usd) (3,273) (3,361)
Pension and OPEB plans    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) (452) (331)
Other comprehensive income (loss) before reclassifications 5 (4)
Amounts reclassified from AOCI (2) (7)
Net other comprehensive income (loss) 3 (11)
Balance, end of period (in usd) (449) (342)
Hedging activities    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) (120) (119)
Other comprehensive income (loss) before reclassifications 9 8
Amounts reclassified from AOCI 2 (3)
Net other comprehensive income (loss) 11 5
Balance, end of period (in usd) (109) (114)
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) (3,554) (3,833)
Balance, end of period (in usd) $ (3,828) $ (3,814)