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Other Comprehensive Income (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Pre-tax |  |  |
Other comprehensive income (loss) | $ 1,033 | $ 518 | $ (2,027)
After-tax |  |  |
Other comprehensive income (loss) | 673 | 339 | (1,316)
Tax |  |  |
Other comprehensive income (loss) | (360) | (179) | 711
Unrealized net capital gains and losses |  |  |
Pre-tax |  |  |
Unrealized net holding during the period | 866 | 486 | (1,896)
Less: reclassification adjustment | 374 | (180) | 112
Other comprehensive income (loss) | 492 | 666 | (2,008)
After-tax |  |  |
Unrealized net holding during the period | 562 | 316 | (1,233)
Less: reclassification adjustment | 243 | (117) | 73
Other comprehensive income (loss) | 319 | 433 | (1,306)
Tax |  |  |
Unrealized net holding during the period | (304) | (170) | 663
Less: reclassification adjustment | (131) | 63 | (39)
Other comprehensive income (loss) | (173) | (233) | 702
Unrealized foreign currency translation adjustments |  |  |
Pre-tax |  |  |
Other comprehensive income (loss) | 72 | 15 | (89)
After-tax |  |  |
Other comprehensive income (loss) | 47 | 10 | (58)
Tax |  |  |
Other comprehensive income (loss) | (25) | (5) | 31
Unrecognized pension and other postretirement benefit cost |  |  |
Pre-tax |  |  |
Unrealized net holding during the period | 232 | (263) | (64)
Less: reclassification adjustment | (237) | (100) | (134)
Other comprehensive income (loss) | 469 | (163) | 70
After-tax |  |  |
Unrealized net holding during the period | 153 | (169) | (39)
Less: reclassification adjustment | (154) | (65) | (87)
Other comprehensive income (loss) | 307 | (104) | 48
Tax |  |  |
Unrealized net holding during the period | (79) | 94 | 25
Less: reclassification adjustment | 83 | 35 | 47
Other comprehensive income (loss) | $ (162) | $ 59 | $ (22)

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