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

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

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