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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

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