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Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 2017
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Other comprehensive income (loss) on a pre-tax and after-tax basis | The components of other comprehensive income on a pre-tax and after-tax basis are as follows:
($ in millions) | Three months ended September 30,
| 2017 |  | 2016
| Pre-tax |  | Tax |  | After-tax |  | Pre-tax |  | Tax |  | After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets | $ | 300 |  |  | $ | (105 | ) |  | $ | 195 |  |  | $ | 350 |  |  | $ | (123 | ) |  | $ | 227 |
Less: reclassification adjustment of realized capital gains and losses | 107 |  |  | (37 | ) |  | 70 |  |  | 53 |  |  | (19 | ) |  | 34 |
Unrealized net capital gains and losses | 193 |  |  | (68 | ) |  | 125 |  |  | 297 |  |  | (104 | ) |  | 193 |
Unrealized foreign currency translation adjustments | 43 |  |  | (15 | ) |  | 28 |  |  | (11 | ) |  | 4 |  |  | (7 | )
Unrecognized pension and other postretirement benefit cost arising during the period | (5 | ) |  | 3 |  |  | (2 | ) |  | 1 |  |  | — |  |  | 1 |
Less: reclassification adjustment of net periodic cost recognized in operating costs and expenses | (116 | ) |  | 41 |  |  | (75 | ) |  | (30 | ) |  | 10 |  |  | (20 | )
Unrecognized pension and other postretirement benefit cost | 111 |  |  | (38 | ) |  | 73 |  |  | 31 |  |  | (10 | ) |  | 21 |
Other comprehensive income | $ | 347 |  |  | $ | (121 | ) |  | $ | 226 |  |  | $ | 317 |  |  | $ | (110 | ) |  | $ | 207 |
| Nine months ended September 30,
| 2017 |  | 2016
| Pre-tax |  | Tax |  | After-tax |  | Pre-tax |  | Tax |  | After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets | $ | 1,165 |  |  | $ | (408 | ) |  | $ | 757 |  |  | $ | 1,685 |  |  | $ | (589 | ) |  | $ | 1,096 |
Less: reclassification adjustment of realized capital gains and losses | 245 |  |  | (86 | ) |  | 159 |  |  | (156 | ) |  | 55 |  |  | (101 | )
Unrealized net capital gains and losses | 920 |  |  | (322 | ) |  | 598 |  |  | 1,841 |  |  | (644 | ) |  | 1,197 |
Unrealized foreign currency translation adjustments | 55 |  |  | (19 | ) |  | 36 |  |  | 18 |  |  | (6 | ) |  | 12 |
Unrecognized pension and other postretirement benefit cost arising during the period | (8 | ) |  | 5 |  |  | (3 | ) |  | (6 | ) |  | 3 |  |  | (3 | )
Less: reclassification adjustment of net periodic cost recognized in operating costs and expenses | (174 | ) |  | 61 |  |  | (113 | ) |  | (78 | ) |  | 27 |  |  | (51 | )
Unrecognized pension and other postretirement benefit cost | 166 |  |  | (56 | ) |  | 110 |  |  | 72 |  |  | (24 | ) |  | 48 |
Other comprehensive income | $ | 1,141 |  |  | $ | (397 | ) |  | $ | 744 |  |  | $ | 1,931 |  |  | $ | (674 | ) |  | $ | 1,257 |

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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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