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Business, Basis of Presentation and Summary of Significant Accounting Policies - Summary Matrix (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Jan. 01, 2021 | Dec. 31, 2020
--- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Premiums, reinsurance and other receivables | $ 28,971 | $ 17,364 |  | $ 18,169 |
Deferred policy acquisition costs and value of business acquired | 20,151 | 19,653 | $ 19,806 | 20,417 |
Other assets | 11,139 | 11,025 |  | 11,742 |
Future policy benefits | 196,406 | 187,222 |  | 224,358 |
Policyholder account balance | 219,269 | 210,597 |  | 211,737 |
Other Policy-Related Balances | 19,736 | 18,424 |  | 18,032 |
Liability | 3,179 | 3,763 |  | 7,901 |
Deferred income tax liability | 927 | 950 |  | 4,723 |
Retained earnings | 40,146 | 40,332 |  | 31,824 |
Accumulated other comprehensive income (loss) | $ (19,242) | (22,621) |  | 315 |
Previously Reported |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Premiums, reinsurance and other receivables |  | 17,461 |  |  | $ 17,870
Deferred policy acquisition costs and value of business acquired |  | 22,983 |  |  | 16,389
Other assets |  | 11,026 |  |  | 11,685
Future policy benefits |  | 204,228 |  |  | 206,656
Policyholder account balance |  | 203,082 |  |  | 205,176
Other Policy-Related Balances |  | 19,651 |  |  | 17,101
Liability |  | 0 |  |  | 0
Deferred income tax liability |  | 325 |  |  | 11,008
Retained earnings |  | 41,953 |  |  | 36,491
Accumulated other comprehensive income (loss) |  | $ (27,083) |  |  | $ 18,072
Reclassification of carrying amount of contracts and contract features that are market risk benefits |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Premiums, reinsurance and other receivables |  |  |  | (59) |
Deferred policy acquisition costs and value of business acquired |  |  |  | 0 |
Other assets |  |  |  | 0 |
Future policy benefits |  |  |  | (1,818) |
Policyholder account balance |  |  |  | (958) |
Other Policy-Related Balances |  |  |  | (72) |
Liability |  |  |  | 2,789 |
Deferred income tax liability |  |  |  | 0 |
Retained earnings |  |  |  | 0 |
Accumulated other comprehensive income (loss) |  |  |  | 0 |
Adjustments for the difference between previous carrying amount and fair value measurement for market risk benefits |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Premiums, reinsurance and other receivables |  |  |  | (12) |
Deferred policy acquisition costs and value of business acquired |  |  |  | 0 |
Other assets |  |  |  | 0 |
Future policy benefits |  |  |  | 0 |
Policyholder account balance |  |  |  | 0 |
Other Policy-Related Balances |  |  |  | 0 |
Liability |  |  |  | 5,112 |
Deferred income tax liability |  |  |  | (1,079) |
Retained earnings |  |  |  | (4,121) |
Accumulated other comprehensive income (loss) |  |  |  | 76 |
Removal of related amounts in accumulated other comprehensive income |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Premiums, reinsurance and other receivables |  |  |  | 0 |
Deferred policy acquisition costs and value of business acquired |  |  |  | 4,007 |
Other assets |  |  |  | 42 |
Future policy benefits |  |  |  | (7,911) |
Policyholder account balance |  |  |  | 0 |
Other Policy-Related Balances |  |  |  | 1,043 |
Liability |  |  |  | 0 |
Deferred income tax liability |  |  |  | 2,405 |
Retained earnings |  |  |  | 0 |
Accumulated other comprehensive income (loss) |  |  |  | 8,512 |
Adjustment of future policy benefits to remeasure cohorts where net premiums exceed gross premiums under the modified retrospective approach |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Premiums, reinsurance and other receivables |  |  |  | 32 |
Deferred policy acquisition costs and value of business acquired |  |  |  | 0 |
Other assets |  |  |  | 0 |
Future policy benefits |  |  |  | 719 |
Policyholder account balance |  |  |  | 0 |
Other Policy-Related Balances |  |  |  | 0 |
Liability |  |  |  | 0 |
Deferred income tax liability |  |  |  | (160) |
Retained earnings |  |  |  | (527) |
Accumulated other comprehensive income (loss) |  |  |  | 0 |
Effect of remeasurement of future policy benefits to an upper-medium grade discount rate |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Premiums, reinsurance and other receivables |  |  |  | 351 |
Deferred policy acquisition costs and value of business acquired |  |  |  | 0 |
Other assets |  |  |  | 0 |
Future policy benefits |  |  |  | 34,119 |
Policyholder account balance |  |  |  | 0 |
Other Policy-Related Balances |  |  |  | 0 |
Liability |  |  |  | 0 |
Deferred income tax liability |  |  |  | (7,438) |
Retained earnings |  |  |  | 0 |
Accumulated other comprehensive income (loss) |  |  |  | (26,330) |
Adjustments for the cumulative effect of adoption on additional insurance assets and liabilities |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Premiums, reinsurance and other receivables |  |  |  | 19 |
Deferred policy acquisition costs and value of business acquired |  |  |  | 0 |
Other assets |  |  |  | 0 |
Future policy benefits |  |  |  | 83 |
Policyholder account balance |  |  |  | 0 |
Other Policy-Related Balances |  |  |  | 0 |
Liability |  |  |  | 0 |
Deferred income tax liability |  |  |  | (13) |
Retained earnings |  |  |  | (42) |
Accumulated other comprehensive income (loss) |  |  |  | (9) |
Other balance sheet reclassifications upon adoption of the LDTI standard |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |
Premiums, reinsurance and other receivables |  |  |  | (32) |
Deferred policy acquisition costs and value of business acquired |  |  |  | 21 |
Other assets |  |  |  | 15 |
Future policy benefits |  |  |  | (7,490) |
Policyholder account balance |  |  |  | 7,519 |
Other Policy-Related Balances |  |  |  | (40) |
Liability |  |  |  | 0 |
Deferred income tax liability |  |  |  | 0 |
Retained earnings |  |  |  | 23 |
Accumulated other comprehensive income (loss) |  |  |  | $ (6) |

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