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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2023 | Jun. 30, 2023 | Mar. 31, 2023 | Sep. 30, 2022 | Jun. 30, 2022 | Mar. 31, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Dec. 31, 2022 | Dec. 31, 2021
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | $ 73,002 | $ 71,580 | $ 71,769 | $ 75,736 | $ 74,034 | $ 75,381 |  | $ 71,769 | $ 75,381 |  |  |
Other comprehensive income (loss) | (146) | 17 | 389 | (385) | (540) | (763) |  | 260 | (1,688) |  |  |
Balance at end of period | 74,510 | 73,002 | 71,580 | 71,487 | 75,736 | 74,034 |  | 74,510 | 71,487 |  |  |
Adoption of new accounting standard, adjustment |  |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period |  |  | 454 |  |  | (540) | [1] | 454 | (540) | [1] |  |
AOCI Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | (858) |  | (1,264) | (969) |  | 965 |  | (1,264) | 965 |  |  |
Balance at end of period | (1,004) | (858) |  | (1,354) | (969) |  |  | (1,004) | (1,354) |  |  |
AOCI Including Portion Attributable to Noncontrolling Interest | Adoption of new accounting standard, adjustment |  |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | 0 |  | 0 | 0 |  | (631) |  | 0 | (631) |  |  |
Balance at end of period |  | 0 |  |  | 0 |  |  |  |  |  |  |
Net unrealized investment gains (losses) |  |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | (1,113) |  | (1,519) | (1,199) |  | 778 |  | (1,519) | 778 |  |  |
Other comprehensive income (loss) before reclassifications, net of tax | (478) |  |  | (725) |  |  |  | (313) | (2,852) |  |  |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 157 |  |  | 88 |  |  |  | 398 | 218 |  |  |
Other comprehensive income (loss) | (321) |  |  | (637) |  |  |  | 85 | (2,634) |  |  |
Balance at end of period | (1,434) | (1,113) |  | (1,836) | (1,199) |  |  | (1,434) | (1,836) |  |  |
OCI before reclassifications, pre-tax | (475) |  |  | (814) |  |  |  | (310) | (3,361) |  |  |
Amounts reclassified, pre-tax | 157 |  |  | 99 |  |  |  | 398 | 253 |  |  |
Net unrealized investment gains (losses) | Adoption of new accounting standard, adjustment |  |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | 0 |  | 0 | 0 |  | 20 |  | 0 | 20 |  |  |
Balance at end of period |  | 0 |  |  | 0 |  |  |  |  |  |  |
Adoption of new accounting standard, pre-tax |  | 0 |  |  | 0 |  |  |  |  |  | $ 0 | $ 26
Change in discount rate on long-duration insurance reserves |  |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | 205 |  | 219 | 28 |  | 0 |  | 219 | 0 |  |  |
Other comprehensive income (loss) before reclassifications, net of tax | 181 |  |  | 250 |  |  |  | 167 | 929 |  |  |
Other comprehensive income (loss) | 181 |  |  | 250 |  |  |  | 167 | 929 |  |  |
Balance at end of period | 386 | 205 |  | 278 | 28 |  |  | 386 | 278 |  |  |
OCI before reclassifications, pre-tax | 233 |  |  | 321 |  |  |  | 210 | 1,195 |  |  |
Change in discount rate on long-duration insurance reserves | Adoption of new accounting standard, adjustment |  |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | 0 |  | 0 | 0 |  | (651) |  | 0 | (651) |  |  |
Balance at end of period |  | 0 |  |  | 0 |  |  |  |  |  |  |
Adoption of new accounting standard, pre-tax |  | 0 |  |  | 0 |  |  |  |  |  | $ 0 | $ (838)
Foreign currency translation adjustments |  |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | 1 |  | 0 | 2 |  | 0 |  | 0 | 0 |  |  |
Other comprehensive income (loss) before reclassifications, net of tax | (2) |  |  | (7) |  |  |  | (1) | (5) |  |  |
Other comprehensive income (loss) | (2) |  |  | (7) |  |  |  | (1) | (5) |  |  |
Balance at end of period | (1) | 1 |  | (5) | 2 |  |  | (1) | (5) |  |  |
Net cash flow hedges |  |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | 252 |  | 239 | 234 |  | 222 |  | 239 | 222 |  |  |
Other comprehensive income (loss) before reclassifications, net of tax | 0 |  |  | 10 |  |  |  | 19 | 28 |  |  |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | (4) |  |  | (2) |  |  |  | (10) | (8) |  |  |
Other comprehensive income (loss) | (4) |  |  | 8 |  |  |  | 9 | 20 |  |  |
Balance at end of period | 248 | 252 |  | 242 | 234 |  |  | 248 | 242 |  |  |
OCI before reclassifications, pre-tax | 0 |  |  | 13 |  |  |  | 25 | 37 |  |  |
Amounts reclassified, pre-tax | (5) |  |  | (2) |  |  |  | (13) | (10) |  |  |
Amount expected to be reclassified | 15 |  |  |  |  |  |  | 15 |  |  |  |
Pension and other postretirement benefits |  |  |  |  |  |  |  |  |  |  |  |
Changes in Accumulated Other Comprehensive Income (Loss) by Component |  |  |  |  |  |  |  |  |  |  |  |
Balance at beginning of period | (203) |  | $ (203) | (34) |  | $ (35) |  | (203) | (35) |  |  |
Amounts reclassified from accumulated other comprehensive income (loss), net of tax | 0 |  |  | 1 |  |  |  | 0 | 2 |  |  |
Other comprehensive income (loss) | 0 |  |  | 1 |  |  |  | 0 | 2 |  |  |
Balance at end of period | (203) | $ (203) |  | (33) | $ (34) |  |  | (203) | (33) |  |  |
Amounts reclassified, pre-tax | $ 0 |  |  | $ 1 |  |  |  | $ 0 | $ 2 |  |  |
[1] | Reflects the adoption of Accounting Standards Update (“ASU”) 2018-12, Targeted Improvements to the Accounting for Long-Duration Contracts (Topic 944) during the three months ended March 31, 2023. See Note 1 ‘‘Significant Accounting Policies’’ for additional information.

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