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Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2020
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,
|  | 2020 |  | 2019 |  | 2018
($ in millions) |  | 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 |  | $ | 2,512 |  |  | $ | (532) |  |  | $ | 1,980 |  |  | $ | 2,807 |  |  | $ | (592) |  |  | $ | 2,215 |  |  | $ | (1,142) |  |  | $ | 241 |  |  | $ | (901) |
Less: reclassification adjustment of realized capital gains and losses |  | 870 |  |  | (183) |  |  | 687 |  |  | 413 |  |  | (87) |  |  | 326 |  |  | (186) |  |  | 39 |  |  | (147) |
Unrealized net capital gains and losses |  | 1,642 |  |  | (349) |  |  | 1,293 |  |  | 2,394 |  |  | (505) |  |  | 1,889 |  |  | (956) |  |  | 202 |  |  | (754) |
Unrealized foreign currency translation adjustments |  | 66 |  |  | (14) |  |  | 52 |  |  | (13) |  |  | 3 |  |  | (10) |  |  | (61) |  |  | 13 |  |  | (48) |
Unamortized pension and other postretirement prior service credit (1) |  | 12 |  |  | (3) |  |  | 9 |  |  | (59) |  |  | 12 |  |  | (47) |  |  | (77) |  |  | 18 |  |  | (59) |
Other comprehensive income (loss) |  | $ | 1,720 |  |  | $ | (366) |  |  | $ | 1,354 |  |  | $ | 2,322 |  |  | $ | (490) |  |  | $ | 1,832 |  |  | $ | (1,094) |  |  | $ | 233 |  |  | $ | (861) |
(1)Represents prior service credits reclassified out of other comprehensive income and amortized into operating costs and expenses.

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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=121641772&loc=d3e526-108580 + Details
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