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Other Comprehensive Income (Tables) | 6 Months Ended
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Jun. 30, 2019
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,
| 2019 |  | 2018
| Pre-tax |  | Tax |  | After-tax |  | Pre-tax |  | Tax |  | After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets |  | $ | 921 |  |  | $ | (194 | ) |  | $ | 727 |  |  | $ | (249 | ) |  | $ | 53 |  |  | $ | (196 | )
Less: reclassification adjustment of realized capital gains and losses |  | 57 |  |  | (12 | ) |  | 45 |  |  | (80 | ) |  | 17 |  |  | (63 | )
Unrealized net capital gains and losses |  | 864 |  |  | (182 | ) |  | 682 |  |  | (169 | ) |  | 36 |  |  | (133 | )
Unrealized foreign currency translation adjustments |  | 5 |  |  | (1 | ) |  | 4 |  |  | (7 | ) |  | 1 |  |  | (6 | )
Unamortized pension and other postretirement prior service credit (1) |  | (14 | ) |  | 3 |  |  | (11 | ) |  | (20 | ) |  | 4 |  |  | (16 | )
Other comprehensive income (loss) |  | $ | 855 |  |  | $ | (180 | ) |  | $ | 675 |  |  | $ | (196 | ) |  | $ | 41 |  |  | $ | (155 | )
|  | Six months ended June 30,
|  | 2019 |  | 2018
|  | Pre-tax |  | Tax |  | After-tax |  | Pre-tax |  | Tax |  | After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets |  | $ | 2,208 |  |  | $ | (467 | ) |  | $ | 1,741 |  |  | $ | (990 | ) |  | $ | 208 |  |  | $ | (782 | )
Less: reclassification adjustment of realized capital gains and losses |  | 108 |  |  | (23 | ) |  | 85 |  |  | (106 | ) |  | 22 |  |  | (84 | )
Unrealized net capital gains and losses |  | 2,100 |  |  | (444 | ) |  | 1,656 |  |  | (884 | ) |  | 186 |  |  | (698 | )
Unrealized foreign currency translation adjustments |  | 11 |  |  | (2 | ) |  | 9 |  |  | (10 | ) |  | 2 |  |  | (8 | )
Unamortized pension and other postretirement prior service credit (1) |  | (29 | ) |  | 6 |  |  | (23 | ) |  | (39 | ) |  | 9 |  |  | (30 | )
Other comprehensive income (loss) |  | $ | 2,082 |  |  | $ | (440 | ) |  | $ | 1,642 |  |  | $ | (933 | ) |  | $ | 197 |  |  | $ | (736 | )
(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=118930883&loc=d3e526-108580 + Details
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