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Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 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 September 30,
| 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 |  | $ | (343) |  |  | $ | 73 |  |  | $ | (270) |  |  | $ | 414 |  |  | $ | (88) |  |  | $ | 326 |
Less: reclassification adjustment of realized capital gains and losses |  | 84 |  |  | (18) |  |  | 66 |  |  | 233 |  |  | (49) |  |  | 184 |
Unrealized net capital gains and losses |  | (427) |  |  | 91 |  |  | (336) |  |  | 181 |  |  | (39) |  |  | 142 |
Unrealized foreign currency translation adjustments |  | (26) |  |  | 5 |  |  | (21) |  |  | 32 |  |  | (7) |  |  | 25 |
Unamortized pension and other postretirement prior service credit (1) |  | (19) |  |  | 4 |  |  | (15) |  |  | 48 |  |  | (10) |  |  | 38 |
Other comprehensive (loss) income |  | $ | (472) |  |  | $ | 100 |  |  | $ | (372) |  |  | $ | 261 |  |  | $ | (56) |  |  | $ | 205 |
|  | Nine months ended September 30,
|  | 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 |  | $ | (1,350) |  |  | $ | 288 |  |  | $ | (1,062) |  |  | $ | 1,777 |  |  | $ | (376) |  |  | $ | 1,401 |
Less: reclassification adjustment of realized capital gains and losses |  | 367 |  |  | (77) |  |  | 290 |  |  | 689 |  |  | (145) |  |  | 544 |
Unrealized net capital gains and losses |  | (1,717) |  |  | 365 |  |  | (1,352) |  |  | 1,088 |  |  | (231) |  |  | 857 |
Unrealized foreign currency translation adjustments |  | 13 |  |  | (3) |  |  | 10 |  |  | (6) |  |  | 1 |  |  | (5) |
Unamortized pension and other postretirement prior service credit (1) |  | (56) |  |  | 12 |  |  | (44) |  |  | 40 |  |  | (9) |  |  | 31 |
Other comprehensive (loss) income |  | $ | (1,760) |  |  | $ | 374 |  |  | $ | (1,386) |  |  | $ | 1,122 |  |  | $ | (239) |  |  | $ | 883 |
(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=124509347&loc=d3e526-108580 + Details
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