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Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2018 | Mar. 31, 2017
Pre-tax |  |
Other comprehensive (loss) income | $ (691) | $ 336
Tax |  |
Other comprehensive (loss) income | 145 | (117)
After-tax |  |
Other comprehensive (loss) income | (546) | 219
Unrealized net holding gains and losses arising during the period, net of related offsets |  |
Pre-tax |  |
Unrealized net holding during the period | (740) | 444
Less: reclassification adjustment | (25) | 132
Other comprehensive (loss) income | (715) | 312
Tax |  |
Unrealized net holding during the period | 155 | (155)
Less: reclassification adjustment | 5 | (46)
Other comprehensive (loss) income | 150 | (109)
After-tax |  |
Unrealized net holding during the period | (585) | 289
Less: reclassification adjustment | (20) | 86
Other comprehensive (loss) income | (565) | 203
Unrealized foreign currency translation adjustments |  |
Pre-tax |  |
Other comprehensive (loss) income | (5) | (5)
Tax |  |
Other comprehensive (loss) income | 1 | 2
After-tax |  |
Other comprehensive (loss) income | (4) | (3)
Unrecognized pension and other postretirement benefit cost |  |
Pre-tax |  |
Unrealized net holding during the period | 3 | 0
Less: reclassification adjustment | (26) | (29)
Other comprehensive (loss) income | 29 | 29
Tax |  |
Unrealized net holding during the period | (1) | 0
Less: reclassification adjustment | 5 | 10
Other comprehensive (loss) income | (6) | (10)
After-tax |  |
Unrealized net holding during the period | 2 | 0
Less: reclassification adjustment | (21) | (19)
Other comprehensive (loss) income | $ 23 | $ 19

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