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RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  |  | $ 20,270 | $ 19,747
Other comprehensive income before reclassifications | $ (121) | $ 12 | (518) | 96
Other-than-temporary impairment not recognized in earnings on debt securities | 0 | 0 | (1) | (2)
Amounts reclassified to the Consolidated Statements of Operations | 13 | 0 | 21 | (7)
Net other comprehensive income | (108) | 12 | (498) | 87
Ending balance | 20,276 | 20,109 | 20,276 | 20,109
Total AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (1,210) | (593) | (820) | (668)
Ending balance | (1,318) | (581) | (1,318) | (581)
Net Unrealized (Losses) Gains on Derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (200) | (76) | (143) | (88)
Other comprehensive income before reclassifications | (26) | (1) | (91) | 22
Other-than-temporary impairment not recognized in earnings on debt securities | 0 | 0 | 0 | 0
Amounts reclassified to the Consolidated Statements of Operations | 11 | (2) | 19 | (13)
Net other comprehensive income | (15) | (3) | (72) | 9
Ending balance | (215) | (79) | (215) | (79)
Net Unrealized (Losses) Gains on Debt Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (575) | (128) | (236) | (186)
Other comprehensive income before reclassifications | (95) | 13 | (427) | 74
Other-than-temporary impairment not recognized in earnings on debt securities | 0 | 0 | (1) | (2)
Amounts reclassified to the Consolidated Statements of Operations | (2) | (1) | (8) | (2)
Net other comprehensive income | (97) | 12 | (436) | 70
Ending balance | (672) | (116) | (672) | (116)
Employee Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance | (435) | (389) | (441) | (394)
Other comprehensive income before reclassifications | 0 | 0 | 0 | 0
Other-than-temporary impairment not recognized in earnings on debt securities | 0 | 0 | 0 | 0
Amounts reclassified to the Consolidated Statements of Operations | 4 | 3 | 10 | 8
Net other comprehensive income | 4 | 3 | 10 | 8
Ending balance | $ (431) | $ (386) | $ (431) | $ (386)

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