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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 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 September 30,
| 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 |  | $ | 1,753 |  |  | $ | (388) |  |  | $ | 1,365 |  |  | $ | (974) |  |  | $ | 210 |  |  | $ | (764) |
Less: reclassification adjustment of realized capital gains and losses |  | 83 |  |  | (17) |  |  | 66 |  |  | (121) |  |  | 24 |  |  | (97) |
Unrealized net capital gains and losses |  | 1,670 |  |  | (371) |  |  | 1,299 |  |  | (853) |  |  | 186 |  |  | (667) |
Unrealized foreign currency translation adjustments |  | 18 |  |  | (4) |  |  | 14 |  |  | (18) |  |  | 4 |  |  | (14) |
Unamortized pension and other postretirement prior service credit (1) |  | — |  |  | — |  |  | — |  |  | (6) |  |  | 1 |  |  | (5) |
Discount rate for reserve for future policy benefits |  | (46) |  |  | 10 |  |  | (36) |  |  | 38 |  |  | (8) |  |  | 30 |
Other comprehensive income (loss) |  | $ | 1,642 |  |  | $ | (365) |  |  | $ | 1,277 |  |  | $ | (839) |  |  | $ | 183 |  |  | $ | (656) |
|  | Nine months ended September 30,
|  | 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 |  | $ | 1,118 |  |  | $ | (253) |  |  | $ | 865 |  |  | $ | (717) |  |  | $ | 152 |  |  | $ | (565) |
Less: reclassification adjustment of realized capital gains and losses |  | (126) |  |  | 26 |  |  | (100) |  |  | (390) |  |  | 82 |  |  | (308) |
Unrealized net capital gains and losses |  | 1,244 |  |  | (279) |  |  | 965 |  |  | (327) |  |  | 70 |  |  | (257) |
Unrealized foreign currency translation adjustments |  | (1) |  |  | — |  |  | (1) |  |  | 81 |  |  | (17) |  |  | 64 |
Unamortized pension and other postretirement prior service credit (1) |  | (2) |  |  | 1 |  |  | (1) |  |  | (18) |  |  | 4 |  |  | (14) |
Discount rate for reserve for future policy benefits |  | (15) |  |  | 3 |  |  | (12) |  |  | 37 |  |  | (8) |  |  | 29 |
Other comprehensive income (loss) |  | $ | 1,226 |  |  | $ | (275) |  |  | $ | 951 |  |  | $ | (227) |  |  | $ | 49 |  |  | $ | (178) |
(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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