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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Summary of Changes in AOCI by Component (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance, beginning of period (in usd) $ 7,708 $ 5,631 $ 8,468 $ 5,895
Other comprehensive income (loss) 181 98 (97) 117
Balance, end of period (in usd) 7,942 8,166 7,942 8,166
CTA        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance, beginning of period (in usd)     (2,985) (3,386)
Other comprehensive income (loss) before reclassifications     (92) (62)
Amounts reclassified from AOCI     0 185
Other comprehensive income (loss)     (92) 123
Balance, end of period (in usd) (3,077) (3,263) (3,077) (3,263)
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     0 0
Amounts reclassified from AOCI     (3) (16)
Other comprehensive income (loss)     (3) (16)
Balance, end of period (in usd) (455) (347) (455) (347)
Hedging activities        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance, beginning of period (in usd)     (120) (119)
Other comprehensive income (loss) before reclassifications     2 15
Amounts reclassified from AOCI     0 (5)
Other comprehensive income (loss)     2 10
Balance, end of period (in usd) (118) (109) (118) (109)
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
Other comprehensive income (loss)     0 0
Balance, end of period (in usd) 3 3 3 3
Total        
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Balance, beginning of period (in usd) (3,828) (3,814) (3,554) (3,833)
Other comprehensive income (loss) before reclassifications     (90) (47)
Amounts reclassified from AOCI     (3) 164
Other comprehensive income (loss) 181 98 (93) 117
Balance, end of period (in usd) $ (3,647) $ (3,716) $ (3,647) $ (3,716)