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Investments Investments (Limited Partnership Investments) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Net Investment Income [Line Items] |  |  |  |  |  |
Payments to Acquire Equity Method Investments |  |  |  | $ 154 | $ 3,154 |
Limited Partnership [Member] | Fair Value Measured at Net Asset Value Per Share [Member] |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Alternative investments | $ 556 | $ 556 |  | 556 |  | $ 496
Net gains (losses) from limited partnership investments |  | (43) | $ 63 | 122 | $ 73 |
BeiGene [Member] |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Carrying value of equity method investment | $ 2,700 | $ 2,700 |  | $ 2,700 |  |
Ownership percentage | 20.30% | 20.30% |  | 20.30% |  |
Equity Method Investments,Quoted Market Price | $ 6,900 | $ 6,900 |  | $ 6,900 |  |
Equity method investment, change in carrying value |  | 50 |  | 50 |  |
Income (Loss) from Equity Method Investments |  | (98) |  | (181) |  |
Equity Method Investment, Amortization of Difference Between Carrying Amount and Underlying Equity |  | 44 |  | 128 |  |
Equity Method Investment, Change In Carrying Value, Other |  | 18 |  | 56 |  |
Neumora Therapeutics, Inc. [Member] |  |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |  |
Equity Method Investment, Aggregate Cost | $ 257 | $ 257 |  | $ 257 |  |
Ownership percentage | 25.90% | 25.90% |  | 25.90% |  |
Payments to Acquire Equity Method Investments | $ 100 |  |  |  |  |
Noncash or Part Noncash Acquisition, Investments Acquired | $ 157 |  |  |  |  |

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