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Other Comprehensive Income (Tables) | 3 Months Ended
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Mar. 31, 2021
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,
| 2021 |  | 2020
| Pre-tax |  | Tax |  | After-tax |  | Pre-tax |  | Tax |  | After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets |  | $ | (1,718) |  |  | $ | 364 |  |  | $ | (1,354) |  |  | $ | (1,433) |  |  | $ | 303 |  |  | $ | (1,130) |
Less: reclassification adjustment of realized capital gains and losses |  | 185 |  |  | (39) |  |  | 146 |  |  | 287 |  |  | (60) |  |  | 227 |
Unrealized net capital gains and losses |  | (1,903) |  |  | 403 |  |  | (1,500) |  |  | (1,720) |  |  | 363 |  |  | (1,357) |
Unrealized foreign currency translation adjustments |  | 43 |  |  | (9) |  |  | 34 |  |  | (49) |  |  | 10 |  |  | (39) |
Unamortized pension and other postretirement prior service credit (1) |  | (19) |  |  | 4 |  |  | (15) |  |  | 6 |  |  | (2) |  |  | 4 |
Other comprehensive (loss) income |  | $ | (1,879) |  |  | $ | 398 |  |  | $ | (1,481) |  |  | $ | (1,763) |  |  | $ | 371 |  |  | $ | (1,392) |
(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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