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Investments (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 USD ($) securities	Dec. 31, 2022 USD ($) securities	Sep. 30, 2022 USD ($)
Investment Narrative [Line Items]
Securities As Percentage Of Consolidated Stockholder Equity	10.00%
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	100.00%	100.00%
Funds withheld at interest	$ 5,725	$ 6,003
Funds Held Under Reinsurance Agreements Asset Specific Client	$ 3,500
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | securities	7,053,000	6,441
Financing Receivable, before Allowance for Credit Loss	$ 7,320	$ 6,653
Real Estate Owned, Transfer to Real Estate Owned	68
Financing Receivable, Troubled Debt Restructuring		$ 77
Mortgage Loans in Process of Foreclosure, Amount			$ 36
Accounts Receivable, Noncurrent, Nonaccrual	$ 41		$ 19
CALIFORNIA
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	12.90%
TEXAS
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	11.40%
CANADA
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	3.70%
UNITED KINGDOM
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	2.40%
WASHINGTON
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	7.80%

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The amount represents the total percentage of each property type in comparison to the total of mortgage loans whose balance represents the amount of loans that are secured by real estate mortgages, offset by the reserve to cover probable credit losses on the loan portfolio.

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