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Investments (BeiGene) (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
Net Investment Income [Line Items] |  |  |  |  |
Income (Loss) from Equity Method Investments |  |  | $ (497) | $ 36 |
Collaborative arrangement with BeiGene, Ltd. [Member] |  |  |  |  |
Net Investment Income [Line Items] |  |  |  |  |
Ownership percentage | 18.20% |  | 18.20% |  | 18.40%
Income (Loss) from Equity Method Investments | $ (80) | $ 14 | $ (188) | (83) |
Equity Method Investment, Amortization of Difference Between Carrying Amount and Underlying Equity | 48 | $ 42 | 95 | $ 84 |
Carrying value of equity method investment | 2,500 |  | 2,500 |  | $ 2,800
Equity Method Investments,Quoted Market Price | $ 3,100 |  | $ 3,100 |  | $ 5,100

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