Investments (Narrative) (Details) $ in Millions		12 Months Ended
		Dec. 31, 2022 USD ($) position		Dec. 31, 2021 USD ($) position		Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Investment Narrative [Line Items]
Funds withheld at interest		$ 6,003		$ 6,954
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total		100.00%		100.00%
Funds Held Under Reinsurance Agreements Asset Specific Client		$ 3,800
Available for Sale at Fair value - Amortized cost		59,663		$ 55,873
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31)		$ 52,901	[1]	$ 60,749	[2]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | position		6,441,000		1,862
Reclassification of Pre Tax Unrealized Gains From AOCI to Investment Income Associated With Limited Partnerships				$ 92
Pre Tax Gains In Investment Related Gains Associated With Investments In Limited Partnerships				70
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest		$ 831		691		$ 553
Financing Receivable, Troubled Debt Restructuring		67
Loans Receivable, Gross, Commercial, Real Estate		6,653		6,329
Financial Asset, Equal to or Greater than 90 Days Past Due
Investment Narrative [Line Items]
Loans Receivable, Gross, Commercial, Real Estate		36		0
Revision of Prior Period, Reclassification, Adjustment
Investment Narrative [Line Items]
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest						102	$ (2)	$ 1	$ 10
Non-Income Producing Securities [Member]
Investment Narrative [Line Items]
Available for Sale at Fair value - Amortized cost		87		26
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31)		45		26
Canadian Province Of Quebec Securities [Member]
Investment Narrative [Line Items]
Available for Sale at Fair value - Amortized cost		982		1,092
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31)		1,068		1,451
Collateral Received Fixed Maturity Securities [Member]
Investment Narrative [Line Items]
Fixed maturity securities available-for-sale at fair value (amortized cost of $59,663 and $55,873; allowance for credit losses of $37 and $31)		1,428		1,922
Carrying Value [Member]
Investment Narrative [Line Items]
Funds withheld at interest	[3]	$ 6,319		6,747
CALIFORNIA
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total		13.30%
TEXAS
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total		11.20%
GEORGIA
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total		7.80%
Canada Segment Reporting Information [Member]
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total		3.60%
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest		$ 118		$ 143		$ 155
UNITED KINGDOM
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total		2.40%

[1] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2022, the fair value of such investments was $683 million

[2] Excludes limited partnerships that are measured at estimated fair value using the NAV per share (or its equivalent) as a practical expedient. As of December 31, 2021, the fair value of such investments was $581 million.

[3] Carrying values presented herein may differ from those in the Company’s consolidated balance sheets because certain items within the respective financial statement captions may be measured at fair value on a recurring basis.