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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Other comprehensive income (loss) on a pre-tax and after-tax basis |
Components of other comprehensive income (loss) on a pre-tax and after-tax basis
|  | For the years ended December 31,
($ in millions) |  | 2017 |  | 2016 |  | 2015
|  | Pre-tax |  | Tax |  | After-tax |  | Pre-tax |  | Tax |  | After-tax |  | Pre-tax |  | Tax |  | After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets |  | $ | 866 |  |  | $ | (304 | ) |  | $ | 562 |  |  | $ | 486 |  |  | $ | (170 | ) |  | $ | 316 |  |  | $ | (1,896 | ) |  | $ | 663 |  |  | $ | (1,233 | )
Less: reclassification adjustment of realized capital gains and losses |  | 374 |  |  | (131 | ) |  | 243 |  |  | (180 | ) |  | 63 |  |  | (117 | ) |  | 112 |  |  | (39 | ) |  | 73 |
Unrealized net capital gains and losses |  | 492 |  |  | (173 | ) |  | 319 |  |  | 666 |  |  | (233 | ) |  | 433 |  |  | (2,008 | ) |  | 702 |  |  | (1,306 | )
Unrealized foreign currency translation adjustments |  | 72 |  |  | (25 | ) |  | 47 |  |  | 15 |  |  | (5 | ) |  | 10 |  |  | (89 | ) |  | 31 |  |  | (58 | )
Unrecognized pension and other postretirement benefit cost arising during the period |  | 232 |  |  | (79 | ) |  | 153 |  |  | (263 | ) |  | 94 |  |  | (169 | ) |  | (64 | ) |  | 25 |  |  | (39 | )
Less: reclassification adjustment of net periodic cost recognized in operating costs and expenses |  | (237 | ) |  | 83 |  |  | (154 | ) |  | (100 | ) |  | 35 |  |  | (65 | ) |  | (134 | ) |  | 47 |  |  | (87 | )
Unrecognized pension and other postretirement benefit cost |  | 469 |  |  | (162 | ) |  | 307 |  |  | (163 | ) |  | 59 |  |  | (104 | ) |  | 70 |  |  | (22 | ) |  | 48 |
Other comprehensive income (loss) |  | $ | 1,033 |  |  | $ | (360 | ) |  | $ | 673 |  |  | $ | 518 |  |  | $ | (179 | ) |  | $ | 339 |  |  | $ | (2,027 | ) |  | $ | 711 |  |  | $ | (1,316 | )

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- References No definition available. + Details
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- Definition Tabular disclosure of components of comprehensive income (loss). Includes, but is not limited to, foreign currency translation adjustments, foreign currency transactions designated as economic hedges of a net investment in foreign entity, gain (loss) and prior service cost (credit) for pension plans and other postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e526-108580 + Details
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