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Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 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 June 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 |  | $ | 706 |  |  | $ | (149) |  |  | $ | 557 |  |  | $ | 2,796 |  |  | $ | (590) |  |  | $ | 2,206 |
Less: reclassification adjustment of realized capital gains and losses |  | 93 |  |  | (20) |  |  | 73 |  |  | 169 |  |  | (35) |  |  | 134 |
Unrealized net capital gains and losses |  | 613 |  |  | (129) |  |  | 484 |  |  | 2,627 |  |  | (555) |  |  | 2,072 |
Unrealized foreign currency translation adjustments |  | (4) |  |  | 1 |  |  | (3) |  |  | 11 |  |  | (2) |  |  | 9 |
Unamortized pension and other postretirement prior service credit (1) |  | (18) |  |  | 4 |  |  | (14) |  |  | (14) |  |  | 3 |  |  | (11) |
Other comprehensive income (loss) |  | $ | 591 |  |  | $ | (124) |  |  | $ | 467 |  |  | $ | 2,624 |  |  | $ | (554) |  |  | $ | 2,070 |
|  | Six months ended June 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 |  | $ | (1,007) |  |  | $ | 215 |  |  | $ | (792) |  |  | $ | 1,363 |  |  | $ | (288) |  |  | $ | 1,075 |
Less: reclassification adjustment of realized capital gains and losses |  | 283 |  |  | (59) |  |  | 224 |  |  | 456 |  |  | (96) |  |  | 360 |
Unrealized net capital gains and losses |  | (1,290) |  |  | 274 |  |  | (1,016) |  |  | 907 |  |  | (192) |  |  | 715 |
Unrealized foreign currency translation adjustments |  | 39 |  |  | (8) |  |  | 31 |  |  | (38) |  |  | 8 |  |  | (30) |
Unamortized pension and other postretirement prior service credit (1) |  | (37) |  |  | 8 |  |  | (29) |  |  | (8) |  |  | 1 |  |  | (7) |
Other comprehensive (loss) income |  | $ | (1,288) |  |  | $ | 274 |  |  | $ | (1,014) |  |  | $ | 861 |  |  | $ | (183) |  |  | $ | 678 |
(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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