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

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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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