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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Statement of Comprehensive Income [Abstract] |  |  |  |
Net unrealized derivative instrument (losses) gains arising during the periods, tax | $ (4) | $ 16 | $ (22) | $ 14
Reclassification adjustment for net derivative losses (gains) included in net income, tax | 3 | (2) | 3 | (6)
Net unrealized debt securities (losses) gains arising during the periods, tax | (19) | 33 | (105) | 36
Other-than-temporary impairment not recognized in earnings on debt securities, tax | 1 | 6 | 0 | (1)
Reclassification of net debt securities (gains) losses to net income, tax | 0 | 0 | (2) | (1)
Amortization of actuarial loss, tax | $ 1 | $ 2 | $ 2 | $ 4

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