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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, 2025
Mar. 31, 2024
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period $ 13,875  
Current period change 352 $ (191)
Balance ending of period 14,140 13,628
URA(D) of securities    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period (831) (723)
Current period change 289 (153)
Balance ending of period (543) (876)
Foreign currency translation and other adjustments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period (323) (195)
Current period change 64 (38)
Balance ending of period (259) (233)
Benefit plan net gain (loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period 16 (16)
Current period change 0 0
Balance ending of period 16 (16)
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance beginning of period (1,138) (934)
Current period change 352 (191)
Balance ending of period $ (786) $ (1,125)