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Fair Value (Narrative) (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 22,236,000,000	$ 22,308,000,000
Fair value of public equity portfolio	97,000,000	1,300,000,000
Other assets	930,000,000	757,000,000
Fixed Maturities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	1,700,000,000	2,100,000,000
Asset Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	4,063,000,000	3,582,000,000
Fair value of public equity portfolio	2,600,000,000	2,000,000,000.0
Market Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Transfer in and/or (out) of Level 3	(779,000,000)	0
Fair Value [Member] | Investments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Other assets	$ 292,000,000	$ 287,000,000

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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