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OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Components of Accumulated Other Comprehensive Income (Loss), Net of Tax (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance beginning of period $ 8,441 $ 10,139  
Current period change 1,063 (2,008) $ (523)
Balance end of period 13,202 8,441 10,139
URA(D) on securities      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance beginning of period (1,709) 239  
Current period change 986 (1,948)  
Balance end of period (723) (1,709) 239
Foreign Currency Translation Adjustment      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance beginning of period (254) (177)  
Current period change 59 (77)  
Balance end of period (195) (254) (177)
Benefit plan net gain (loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance beginning of period (33) (50)  
Current period change 17 17  
Balance end of period (16) (33) (50)
Accumulated Other Comprehensive Income (Loss)      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Balance beginning of period (1,996) 12 535
Current period change 1,063 (2,008) (523)
Balance end of period $ (934) $ (1,996) $ 12