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OTHER COMPREHENSIVE INCOME (LOSS) - Changes in AOCI (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period $ 5,653 $ 5,150
Other comprehensive (loss) income before reclassifications 39  
Amounts reclassified from AOCI 3  
Other Comprehensive Income (Loss) 42 (140)
Balance at end of period 5,788 5,439
Unrealized Net Gains (Losses) on Debt Securities Available for Sale    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (269)  
Other comprehensive (loss) income before reclassifications 35  
Amounts reclassified from AOCI 0  
Other Comprehensive Income (Loss) 35  
Balance at end of period (234)  
Unrealized Net Gains (Losses) on Derivative Instruments    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (44)  
Other comprehensive (loss) income before reclassifications 4  
Amounts reclassified from AOCI 3  
Other Comprehensive Income (Loss) 7  
Balance at end of period (37)  
Unrecognized Pension and Postretirement Obligations    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (44)  
Other comprehensive (loss) income before reclassifications 0  
Amounts reclassified from AOCI 0  
Other Comprehensive Income (Loss) 0  
Balance at end of period (44)  
Accumulated Other Comprehensive Income (Loss)    
AOCI Attributable to Parent, Net of Tax [Roll Forward]    
Balance at beginning of period (357) (62)
Balance at end of period $ (315) $ (202)