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Investments Investments - Equity Investments (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity Securities Excluded From Fair Value Table | $ 8 |  | $ 8 |  | $ 8
Equity Securities, FV-NI, Realized Gain (Loss) | (14) | $ 1 |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 | $ 0 | 0 | $ 0 | 0
Real Estate [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 39 |  | 39 |  | 33
Hedge Funds, Multi-strategy [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 188 |  | 188 |  | 216
Interest Rate Contract [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 70 |  | 70 |  | 78
Illiquid Investments [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 86 |  | 86 |  | 88
Insurance Linked [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 1 |  | 1 |  | 2
Equity [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 75 |  | 75 |  | 98
Credit Index Product [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 83 |  | 83 |  | 107
Private Equity Funds [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 42 |  | 42 |  | 37
Emerging Market Debt [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 0 |  | 0 |  | 24
Equity investments in pooled funds [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 590 |  | 590 |  | 683
Equity Securities Excluded From Fair Value |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Debt Securities, Available-for-sale, Allowance for Credit Loss | 0 |  | 0 |  | 0
Priced Through Pricing Vendors [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 72 |  | 72 |  | 106
Priced Through Pricing Vendors [Member] | Equity [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 72 |  | 72 |  | 82
Priced Through Pricing Vendors [Member] | Emerging Market Debt [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | 0 |  | 0 |  | $ 24
Gains (losses) on securities held as of reporting date [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Equity Securities, FV-NI, Realized Gain (Loss) |  |  | (25) | $ 1 |
Commitments [Member] | Partnership Interest [Member] |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Other investments | $ 65 |  | $ 65 |  |

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