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OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Components of Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period $ 13,202  
Current period change (191) $ 280
Balance end of period 13,628 9,014
URA(D) on securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period (723) (1,709)
Current period change (153) 249
Balance end of period (876) (1,460)
Foreign currency translation adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period (195) (254)
Current period change (38) 31
Balance end of period (233) (223)
Benefit plan net gain (loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period (16) (33)
Current period change 0 0
Balance end of period (16) (33)
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period (934) (1,996)
Current period change (191) 280
Balance end of period $ (1,125) $ (1,716)