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Other Comprehensive Income (Tables) | 9 Months Ended
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Sep. 30, 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
($ in millions) |  | Three months ended September 30,
| 2020 |  | 2019
| Pre-tax |  | Tax |  | After-tax |  | Pre-tax |  | Tax |  | After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets |  | $ | 414 |  |  | $ | (88 | ) |  | $ | 326 |  |  | $ | 603 |  |  | $ | (127 | ) |  | $ | 476 |
Less: reclassification adjustment of realized capital gains and losses |  | 233 |  |  | (49 | ) |  | 184 |  |  | 136 |  |  | (29 | ) |  | 107 |
Unrealized net capital gains and losses |  | 181 |  |  | (39 | ) |  | 142 |  |  | 467 |  |  | (98 | ) |  | 369 |
Unrealized foreign currency translation adjustments |  | 32 |  |  | (7 | ) |  | 25 |  |  | (12 | ) |  | 2 |  |  | (10 | )
Unamortized pension and other postretirement prior service credit (1) |  | 48 |  |  | (10 | ) |  | 38 |  |  | (15 | ) |  | 3 |  |  | (12 | )
Other comprehensive income (loss) |  | $ | 261 |  |  | $ | (56 | ) |  | $ | 205 |  |  | $ | 440 |  |  | $ | (93 | ) |  | $ | 347 |
|  | Nine months ended September 30,
|  | 2020 |  | 2019
|  | Pre-tax |  | Tax |  | After-tax |  | Pre-tax |  | Tax |  | After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets |  | $ | 1,777 |  |  | $ | (376 | ) |  | $ | 1,401 |  |  | $ | 2,811 |  |  | $ | (593 | ) |  | $ | 2,218 |
Less: reclassification adjustment of realized capital gains and losses |  | 689 |  |  | (145 | ) |  | 544 |  |  | 244 |  |  | (51 | ) |  | 193 |
Unrealized net capital gains and losses |  | 1,088 |  |  | (231 | ) |  | 857 |  |  | 2,567 |  |  | (542 | ) |  | 2,025 |
Unrealized foreign currency translation adjustments |  | (6 | ) |  | 1 |  |  | (5 | ) |  | (1 | ) |  | — |  |  | (1 | )
Unamortized pension and other postretirement prior service credit (1) |  | 40 |  |  | (9 | ) |  | 31 |  |  | (44 | ) |  | 9 |  |  | (35 | )
Other comprehensive income (loss) |  | $ | 1,122 |  |  | $ | (239 | ) |  | $ | 883 |  |  | $ | 2,522 |  |  | $ | (533 | ) |  | $ | 1,989 |
(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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