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Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Pre-tax |  |  |  |
Other comprehensive (loss) income | $ (150) | $ 458 | $ (841) | $ 794
Tax |  |  |  |
Other comprehensive (loss) income | 32 | (159) | 177 | (276)
After-tax |  |  |  |
Other comprehensive (loss) income | (118) | 299 | (664) | 518
Unrealized net holding gains and losses arising during the period, net of related offsets |  |  |  |
Pre-tax |  |  |  |
Unrealized net holding during the period | (249) | 479 | (990) | 901
Less: reclassification adjustment | (80) | 64 | (106) | 174
Other comprehensive (loss) income | (169) | 415 | (884) | 727
Tax |  |  |  |
Unrealized net holding during the period | 53 | (167) | 208 | (315)
Less: reclassification adjustment | 17 | (22) | 22 | (61)
Other comprehensive (loss) income | 36 | (145) | 186 | (254)
After-tax |  |  |  |
Unrealized net holding during the period | (196) | 312 | (782) | 586
Less: reclassification adjustment | (63) | 42 | (84) | 113
Other comprehensive (loss) income | (133) | 270 | (698) | 473
Unrealized foreign currency translation adjustments |  |  |  |
Pre-tax |  |  |  |
Other comprehensive (loss) income | (9) | 17 | (14) | 12
Tax |  |  |  |
Other comprehensive (loss) income | 2 | (6) | 3 | (4)
After-tax |  |  |  |
Other comprehensive (loss) income | (7) | 11 | (11) | 8
Unrecognized pension and other postretirement benefit cost |  |  |  |
Pre-tax |  |  |  |
Unrealized net holding during the period | 1 | (3) | 4 | (3)
Less: reclassification adjustment | (27) | (29) | (53) | (58)
Other comprehensive (loss) income | 28 | 26 | 57 | 55
Tax |  |  |  |
Unrealized net holding during the period | 0 | 2 | (1) | 2
Less: reclassification adjustment | 6 | 10 | 11 | 20
Other comprehensive (loss) income | (6) | (8) | (12) | (18)
After-tax |  |  |  |
Unrealized net holding during the period | 1 | (1) | 3 | (1)
Less: reclassification adjustment | (21) | (19) | (42) | (38)
Other comprehensive (loss) income | $ 22 | $ 18 | $ 45 | $ 37

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