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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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