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Other Comprehensive Income (Loss) (Tables) | 3 Months Ended
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Mar. 31, 2024
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract] |
Schedule of Components of 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,
| 2024 |  | 2023
| Pre-tax |  | Tax |  | After-tax |  | Pre-tax |  | Tax |  | After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets |  | $ | (375) |  |  | $ | 80 |  |  | $ | (295) |  |  | $ | 729 |  |  | $ | (156) |  |  | $ | 573 |
Less: reclassification adjustment of realized capital gains and losses |  | (101) |  |  | 21 |  |  | (80) |  |  | (138) |  |  | 29 |  |  | (109) |
Unrealized net capital gains and losses |  | (274) |  |  | 59 |  |  | (215) |  |  | 867 |  |  | (185) |  |  | 682 |
Unrealized foreign currency translation adjustments |  | 10 |  |  | (2) |  |  | 8 |  |  | 63 |  |  | (13) |  |  | 50 |
Unamortized pension and other postretirement prior service credit (1) |  | (1) |  |  | — |  |  | (1) |  |  | (6) |  |  | 2 |  |  | (4) |
Discount rate for reserve for future policy benefits |  | 32 |  |  | (7) |  |  | 25 |  |  | (11) |  |  | 2 |  |  | (9) |
Other comprehensive (loss) income |  | $ | (233) |  |  | $ | 50 |  |  | $ | (183) |  |  | $ | 913 |  |  | $ | (194) |  |  | $ | 719 |
(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 -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Paragraph 1 -Section 45 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482790/220-10-45-1 + Details
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