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Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Pre-tax |  |  |  |
Other comprehensive (loss) income | $ (22) | $ 347 | $ (863) | $ 1,141
Tax |  |  |  |
Other comprehensive (loss) income | 6 | (121) | 183 | (397)
After-tax |  |  |  |
Other comprehensive (loss) income | (16) | 226 | (680) | 744
Unrealized net holding gains and losses arising during the period, net of related offsets |  |  |  |
Pre-tax |  |  |  |
Unrealized net holding during the period | (116) | 300 | (1,103) | 1,165
Less: reclassification adjustment | (26) | 107 | (129) | 245
Other comprehensive (loss) income | (90) | 193 | (974) | 920
Tax |  |  |  |
Unrealized net holding during the period | 25 | (105) | 233 | (408)
Less: reclassification adjustment | 5 | (37) | 27 | (86)
Other comprehensive (loss) income | 20 | (68) | 206 | (322)
After-tax |  |  |  |
Unrealized net holding during the period | (91) | 195 | (870) | 757
Less: reclassification adjustment | (21) | 70 | (102) | 159
Other comprehensive (loss) income | (70) | 125 | (768) | 598
Unrealized foreign currency translation adjustments |  |  |  |
Pre-tax |  |  |  |
Other comprehensive (loss) income | (18) | 43 | (32) | 55
Tax |  |  |  |
Other comprehensive (loss) income | 4 | (15) | 7 | (19)
After-tax |  |  |  |
Other comprehensive (loss) income | (14) | 28 | (25) | 36
Unrecognized pension and other postretirement benefit cost |  |  |  |
Pre-tax |  |  |  |
Unrealized net holding during the period | 0 | (5) | 4 | (8)
Less: reclassification adjustment | (86) | (116) | (139) | (174)
Other comprehensive (loss) income | 86 | 111 | 143 | 166
Tax |  |  |  |
Unrealized net holding during the period | 0 | 3 | (1) | 5
Less: reclassification adjustment | 18 | 41 | 29 | 61
Other comprehensive (loss) income | (18) | (38) | (30) | (56)
After-tax |  |  |  |
Unrealized net holding during the period | 0 | (2) | 3 | (3)
Less: reclassification adjustment | (68) | (75) | (110) | (113)
Other comprehensive (loss) income | $ 68 | $ 73 | $ 113 | $ 110

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