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Investments - Narrative (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) | Dec. 31, 2021 USD ($) security | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Schedule of Investments [Line Items] |  |  |  |
Unfunded commitments to limited partnerships |  | $ 366 | $ 290 |
Investments accounted for using the equity method |  | $ 1,517 | 1,235 |
Percentage (based on unrealized loss) of available for sale fixed maturities that are in unrealized loss position and rated investment grade |  | 84.00% |  |
Percentage (based on fair value) of available for sale fixed maturities that are in unrealized loss position and rated investment grade |  | 95.00% |  |
Net investment income |  | $ 730 | 461 | $ 532
Assets of discontinued annuity operations | Annuity subsidiaries |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Investments accounted for using the equity method |  |  | $ 646 |
Multifamily |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of real estate-related investments by property type |  | 88.00% | 87.00% |
Single Family |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of real estate-related investments by property type |  | 1.00% | 2.00% |
Other Property |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Percent of real estate-related investments by property type |  | 11.00% | 11.00% |
Neon Capital Limited |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Net investment income |  |  | $ (5) |
Neon Capital Limited | Accounting Standards Update 2016-01 | Equity securities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Net investment income | $ (7) |  |  |
Fixed maturities |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross unrealized losses on available for sale fixed maturities |  | $ (28) | (21) |
Number of fixed maturities in an unrealized loss position | security |  | 514,000,000 |  |
Fixed maturities | Assets of discontinued annuity operations | Annuity subsidiaries |  |  |  |
Schedule of Investments [Line Items] |  |  |  |
Gross unrealized losses on available for sale fixed maturities |  |  | $ (97) |

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