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ACCUMULATED OTHER COMPREHENSIVE INCOME - Summary of Changes in AOCI by Component (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Gains (losses)        
Balance, beginning of period (in usd) $ 8,903 $ 8,535 $ 9,121 $ 8,726
Other comprehensive income (loss) before reclassifications     (752) (239)
Amounts reclassified from AOCI     78 71
Net other comprehensive income (loss) (287) (106) (674) (168)
Balance, end of period (in usd) 5,579 8,815 5,579 8,815
CTA        
Gains (losses)        
Balance, beginning of period (in usd)     (2,907) (2,587)
Other comprehensive income (loss) before reclassifications     (816) (257)
Amounts reclassified from AOCI     65 0
Net other comprehensive income (loss)     (751) (257)
Balance, end of period (in usd) (3,658) (2,844) (3,658) (2,844)
Pension and OPEB plans        
Gains (losses)        
Balance, beginning of period (in usd)     (347) (574)
Other comprehensive income (loss) before reclassifications     29 13
Amounts reclassified from AOCI     19 50
Net other comprehensive income (loss)     48 63
Balance, end of period (in usd) (299) (511) (299) (511)
Hedging activities        
Gains (losses)        
Balance, beginning of period (in usd)     (126) (153)
Other comprehensive income (loss) before reclassifications     33 5
Amounts reclassified from AOCI     (6) 21
Net other comprehensive income (loss)     27 26
Balance, end of period (in usd) (99) (127) (99) (127)
Available-for-sale Debt securities        
Gains (losses)        
Balance, beginning of period (in usd)     0  
Other comprehensive income (loss) before reclassifications     2  
Amounts reclassified from AOCI     0  
Net other comprehensive income (loss)     2  
Balance, end of period (in usd) 2   2  
Total        
Gains (losses)        
Balance, beginning of period (in usd)     (3,380) (3,314)
Balance, end of period (in usd) $ (4,054) $ (3,482) $ (4,054) $ (3,482)