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RECLASSIFICATIONS OUT OF ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) - Schedule of Accumulated Other Comprehensive (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  | $ 20,270 | $ 19,747 | $ 19,646
Other comprehensive loss before reclassifications |  | (272) | (20) | (201)
Other-than-temporary impairment not recognized in earnings on debt securities |  | (3) | 0 | (17)
Amounts reclassified to the Consolidated Statements of Operations |  | (1) | 13 | (63)
Reclassification of tax effects resulting from the 2017 Tax Legislation |  |  | 0 |
Net other comprehensive loss |  | (276) | (7) | (281)
Ending balance |  | 20,817 | 20,270 | 19,747
Net Unrealized (Losses) Gains on Derivatives |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  | (143) | (88) | 10
Other comprehensive loss before reclassifications |  | (33) | (14) | (62)
Other-than-temporary impairment not recognized in earnings on debt securities |  | 0 |  | 0
Amounts reclassified to the Consolidated Statements of Operations |  | 33 | (16) | (36)
Reclassification of tax effects resulting from the 2017 Tax Legislation | [1] |  | (25) |
Net other comprehensive loss |  | 0 | (30) | (98)
Ending balance |  | (143) | (143) | (88)
Net Unrealized (Losses) Gains on Securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  | (236) | (186) | (28)
Other comprehensive loss before reclassifications |  | (239) | (6) | (139)
Other-than-temporary impairment not recognized in earnings on debt securities |  | (3) |  | (17)
Amounts reclassified to the Consolidated Statements of Operations |  | (12) | (2) | (2)
Reclassification of tax effects resulting from the 2017 Tax Legislation | [1] |  | (42) |
Net other comprehensive loss |  | (254) | (8) | (158)
Ending balance |  | (490) | (236) | (186)
Employee Benefit Plans |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  | (441) | (394) | (369)
Other comprehensive loss before reclassifications |  | 0 | 0 | 0
Other-than-temporary impairment not recognized in earnings on debt securities |  | 0 |  | 0
Amounts reclassified to the Consolidated Statements of Operations |  | (22) | 31 | (25)
Reclassification of tax effects resulting from the 2017 Tax Legislation | [1] |  | (78) |
Net other comprehensive loss |  | (22) | 31 | (25)
Ending balance |  | (463) | (441) | (394)
Total AOCI |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
Beginning balance |  | (820) | (668) | (387)
Reclassification of tax effects resulting from the 2017 Tax Legislation | [1] |  | (145) |
Ending balance |  | $ (1,096) | $ (820) | $ (668)
[1] | As of December 31, 2017, the balance of AOCI reflects the retrospective adoption of FASB ASU 2018-02, Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. For further discussion, see Note 22 “Income Taxes.”

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- Definition Amount of increase (decrease) in accumulated other comprehensive income (AOCI) for reclassification to retained earnings of tax effect from remeasurement of deferred tax pursuant to Tax Cuts and Jobs Act of 2017. + References No definition available. + Details
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- Definition Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=109228884&loc=d3e1436-108581 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=114867106&loc=SL7669686-108580 + Details
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