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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2019
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) |  | 2019 |  | 2018 |  | 2017
|  | 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 |  | $ | 2,807 |  |  | $ | (592 | ) |  | $ | 2,215 |  |  | $ | (1,142 | ) |  | $ | 241 |  |  | $ | (901 | ) |  | $ | 866 |  |  | $ | (304 | ) |  | $ | 562 |
Less: reclassification adjustment of realized capital gains and losses |  | 413 |  |  | (87 | ) |  | 326 |  |  | (186 | ) |  | 39 |  |  | (147 | ) |  | 374 |  |  | (131 | ) |  | 243 |
Unrealized net capital gains and losses |  | 2,394 |  |  | (505 | ) |  | 1,889 |  |  | (956 | ) |  | 202 |  |  | (754 | ) |  | 492 |  |  | (173 | ) |  | 319 |
Unrealized foreign currency translation adjustments |  | (13 | ) |  | 3 |  |  | (10 | ) |  | (61 | ) |  | 13 |  |  | (48 | ) |  | 69 |  |  | (24 | ) |  | 45 |
Unamortized pension and other postretirement prior service credit |  | (59 | ) |  | 12 |  |  | (47 | ) |  | (77 | ) |  | 18 |  |  | (59 | ) |  | (80 | ) |  | 28 |  |  | (52 | )
Other comprehensive income (loss) |  | $ | 2,322 |  |  | $ | (490 | ) |  | $ | 1,832 |  |  | $ | (1,094 | ) |  | $ | 233 |  |  | $ | (861 | ) |  | $ | 481 |  |  | $ | (169 | ) |  | $ | 312 |

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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=118930883&loc=d3e526-108580 + Details
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