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Investments - Additional Information (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Schedule of Investments [Line Items] |  |  |  |
Variable Interest Entity, Primary Beneficiary, Maximum Loss Exposure, Amount |  | $ 0 | $ 0 |
Proceeds from Sale of Debt Securities, Available-for-sale |  | 22,457 | 19,534 | $ 18,499
Maximum exposure to loss for variable interest |  | $ 1,900 | 1,300 |
Required collateral under securities lending |  | 100.00% |  |
Securities Loaned |  | $ 0 | 0 |
Securities for Reverse Repurchase Agreements |  | 30 | 30 |
Income (Loss) from Equity Method Investments |  | 630 | 244 | 267
Equity method investments |  | 2,900 |  |
Commitments to fund limited partnership and alternative investments |  | $ 1,600 |  |
Aggregate investment income from limited partnerships and other alternative investments |  | 10.00% |  |
Total assets |  | $ 76,578 | 74,111 |
Total liabilities |  | 58,735 | 55,555 |
Total net investment income |  | 2,313 | 1,846 | 1,951
Life and Annuity Insurance Product Line, Run-off Business |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Proceeds from Sale of Equity Method Investments | $ 217 |  |  |
Equity Method Investment, Realized Gain (Loss) on Disposal | $ 46 | 46 |  |
Limited Partner [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total net investment income |  | 2,100 | 954 | 618
Equity Method Investment, Nonconsolidated Investee or Group of Investees [Member] | Limited Partner [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Total assets |  | 249,800 | 339,600 |
Total liabilities |  | 41,000 | 181,500 |
Total net investment income |  | $ 46,700 | 7,400 | 13,400
Maximum |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Term of security lending agreement |  | 90 days |  |
Variable Interest Entity, Not Primary Beneficiary [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Commitments for variable interest |  | $ 1,400 | 768 |
US Treasury Securities [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Restricted |  | 9 | 34 |
Fixed maturities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Proceeds from Sale of Debt Securities, Available-for-sale |  | $ 15,900 | $ 15,100 | $ 14,400
Domestic [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Collateral provided by borrowers under securities lending |  | 102.00% |  |
Non-domestic [Member] |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Collateral provided by borrowers under securities lending |  | 105.00% |  |

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