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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Changes in AOCI by Component (Details) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) $ 5,895 $ 9,121
Other comprehensive income (loss) before reclassifications (47) (752)
Amounts reclassified from AOCI 164 78
Net other comprehensive income (loss) 117 (674)
Balance, end of period (in usd) 8,166 5,579
CTA    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) (3,386) (2,907)
Other comprehensive income (loss) before reclassifications (62) (816)
Amounts reclassified from AOCI 185 65
Net other comprehensive income (loss) 123 (751)
Balance, end of period (in usd) (3,263) (3,658)
Pension and OPEB plans    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) (331) (347)
Other comprehensive income (loss) before reclassifications 0 29
Amounts reclassified from AOCI (16) 19
Net other comprehensive income (loss) (16) 48
Balance, end of period (in usd) (347) (299)
Hedging activities    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) (119) (126)
Other comprehensive income (loss) before reclassifications 15 33
Amounts reclassified from AOCI (5) (6)
Net other comprehensive income (loss) 10 27
Balance, end of period (in usd) (109) (99)
Available-for-sale debt securities    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) 3 0
Other comprehensive income (loss) before reclassifications 0 2
Amounts reclassified from AOCI 0 0
Net other comprehensive income (loss) 0 2
Balance, end of period (in usd) 3 2
Total    
Increase (Decrease) in Stockholders' Equity [Roll Forward]    
Balance, beginning of period (in usd) (3,833) (3,380)
Balance, end of period (in usd) $ (3,716) $ (4,054)