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Fair Value (Narrative) (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
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 21,009		$ 21,009		$ 22,308
Fair value of public equity portfolio	1,200		1,200		1,300
Other invested assets	876		876		757
Fixed maturities - held to maturity, at amortized cost, net of credit allowances (fair value: 2022, $817, credit allowances: 2022, $(9))	837		837
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value	817		817
Market Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfer in/(out) of Level 3 and reclassification of securities in/(out) of investment categories	(779)		(779)
Fair Value [Member] | Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other invested assets	309		309		287
Fixed Maturities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,600		1,600		2,100
Asset Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	3,772		3,772		3,582
Fair value of public equity portfolio	2,400		2,400		$ 2,000
Fixed maturities - held to maturity, at amortized cost, net of credit allowances, fair value	$ 639		$ 639

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