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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2023
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,
| 2023 |  | 2022
| Pre-tax |  | Tax |  | After-tax |  | Pre-tax |  | Tax |  | After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets |  | $ | (974) |  |  | $ | 210 |  |  | $ | (764) |  |  | $ | (1,161) |  |  | $ | 246 |  |  | $ | (915) |
Less: reclassification adjustment of realized capital gains and losses |  | (121) |  |  | 24 |  |  | (97) |  |  | (159) |  |  | 33 |  |  | (126) |
Unrealized net capital gains and losses |  | (853) |  |  | 186 |  |  | (667) |  |  | (1,002) |  |  | 213 |  |  | (789) |
Unrealized foreign currency translation adjustments |  | (18) |  |  | 4 |  |  | (14) |  |  | (112) |  |  | 24 |  |  | (88) |
Unamortized pension and other postretirement prior service credit (1) |  | (6) |  |  | 1 |  |  | (5) |  |  | (9) |  |  | 1 |  |  | (8) |
Discount rate for reserve for future policy benefits |  | 38 |  |  | (8) |  |  | 30 |  |  | 66 |  |  | (14) |  |  | 52 |
Other comprehensive (loss) income |  | $ | (839) |  |  | $ | 183 |  |  | $ | (656) |  |  | $ | (1,057) |  |  | $ | 224 |  |  | $ | (833) |
|  | Nine months ended September 30,
|  | 2023 |  | 2022
|  | Pre-tax |  | Tax |  | After-tax |  | Pre-tax |  | Tax |  | After-tax
Unrealized net holding gains and losses arising during the period, net of related offsets |  | $ | (717) |  |  | $ | 152 |  |  | $ | (565) |  |  | $ | (5,083) |  |  | $ | 1,080 |  |  | $ | (4,003) |
Less: reclassification adjustment of realized capital gains and losses |  | (390) |  |  | 82 |  |  | (308) |  |  | (602) |  |  | 126 |  |  | (476) |
Unrealized net capital gains and losses |  | (327) |  |  | 70 |  |  | (257) |  |  | (4,481) |  |  | 954 |  |  | (3,527) |
Unrealized foreign currency translation adjustments |  | 81 |  |  | (17) |  |  | 64 |  |  | (171) |  |  | 36 |  |  | (135) |
Unamortized pension and other postretirement prior service credit (1) |  | (18) |  |  | 4 |  |  | (14) |  |  | (47) |  |  | 9 |  |  | (38) |
Discount rate for reserve for future policy benefits |  | 37 |  |  | (8) |  |  | 29 |  |  | 294 |  |  | (62) |  |  | 232 |
Other comprehensive (loss) income |  | $ | (227) |  |  | $ | 49 |  |  | $ | (178) |  |  | $ | (4,405) |  |  | $ | 937 |  |  | $ | (3,468) |
(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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