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

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=114867106&loc=d3e526-108580 + Details
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