Investments (BeiGene) (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Net Investment Income [Line Items]
Income (Loss) from Equity Method Investments			$ (713)	$ (130)
BeiGene
Net Investment Income [Line Items]
Ownership percentage	18.20%		18.20%		18.40%
Income (Loss) from Equity Method Investments	$ (104)	$ (98)	$ (292)	(181)
Equity Method Investment, Amortization of Difference Between Carrying Amount and Underlying Equity	48	$ 44	143	$ 128
Carrying value of equity method investment	2,300		2,300		$ 2,800
Equity Method Investments,Quoted Market Price	$ 2,600		$ 2,600		$ 5,100

Equity Method Investment, Amortization of Difference Between Carrying Amount and Underlying Equity

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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