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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance $ 22,201 $ 20,817 $ 20,270
Other comprehensive loss before reclassifications 479 604 (272)
Other-than-temporary impairment not recognized in earnings on debt securities 0 0 (3)
Amounts reclassified to the Consolidated Statements of Operations (128) 76 (1)
Total other comprehensive income (loss), net of income taxes 351 680 (276)
Ending balance 22,673 22,201 20,817
Total AOCI      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (411) (1,096) (820)
Total other comprehensive income (loss), net of income taxes 351 680 (276)
Ending balance (60) (411) (1,096)
Net Unrealized (Losses) Gains on Derivatives      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 3 (143) (143)
Other comprehensive loss before reclassifications 97 103 (33)
Other-than-temporary impairment not recognized in earnings on debt securities     0
Amounts reclassified to the Consolidated Statements of Operations (111) 43 33
Total other comprehensive income (loss), net of income taxes (14) 146 0
Ending balance (11) 3 (143)
Net Unrealized (Losses) Gains on Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 1 (490) (236)
Other comprehensive loss before reclassifications 382 501 (239)
Other-than-temporary impairment not recognized in earnings on debt securities     (3)
Amounts reclassified to the Consolidated Statements of Operations (3) (15) (12)
Total other comprehensive income (loss), net of income taxes 379 486 (254)
Ending balance 380 1 (490)
Employee Benefit Plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance (415) (463) (441)
Other comprehensive loss before reclassifications 0 0 0
Other-than-temporary impairment not recognized in earnings on debt securities     0
Amounts reclassified to the Consolidated Statements of Operations (14) 48 (22)
Total other comprehensive income (loss), net of income taxes (14) 48 (22)
Ending balance (429) (415) (463)
Cumulative Effect, Period of Adoption, Adjustment      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 17    
Ending balance (331) 17  
Cumulative Effect, Period of Adoption, Adjustment | Total AOCI      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance 5 5  
Ending balance $ 0 5 5
Cumulative Effect, Period of Adoption, Adjustment | Net Unrealized (Losses) Gains on Derivatives      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance   0  
Ending balance     0
Cumulative Effect, Period of Adoption, Adjustment | Net Unrealized (Losses) Gains on Securities      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance   5  
Ending balance     5
Cumulative Effect, Period of Adoption, Adjustment | Employee Benefit Plans      
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]      
Beginning balance   $ 0  
Ending balance     $ 0