Investments (Narrative) (Details) $ in Millions		12 Months Ended
		Dec. 31, 2024 USD ($) position		Dec. 31, 2023 USD ($) position		Dec. 31, 2022 USD ($)
Investment Narrative [Line Items]
Funds withheld at interest		$ 5,436		$ 5,683
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total		100.00%		100.00%
Funds Held Under Reinsurance Agreements Asset Specific Client		$ 3,100
Available for Sale at Fair value - Amortized cost		82,907		$ 64,977
Fixed maturity securities available-for-sale at fair value (amortized cost of $82,907 and $64,977; allowance for credit losses of $98 and $75)		$ 77,617	[1]	$ 60,467	[2]
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | position		6,401,000		5,788
Financing Receivable, Troubled Debt Restructuring				$ 92
Loans Receivable, Gross, Commercial, Real Estate		$ 8,952		7,459
Real Estate Owned, Transfer to Real Estate Owned		124		62
Accounts Receivable, Noncurrent, Nonaccrual		6		7
Mortgage Loans in Process of Foreclosure, Amount				46
Real Estate Held For Sale Transferred To Held For Use		21
Allowance For Credit Losses Real Estate Modified						$ 67
Financial Asset, Equal to or Greater than 90 Days Past Due
Investment Narrative [Line Items]
Loans Receivable, Gross, Commercial, Real Estate		6		0
Non-Income Producing Securities [Member]
Investment Narrative [Line Items]
Available for Sale at Fair value - Amortized cost		144		88
Fixed maturity securities available-for-sale at fair value (amortized cost of $82,907 and $64,977; allowance for credit losses of $98 and $75)		159		46
Canadian Province Of Quebec Securities [Member]
Investment Narrative [Line Items]
Fixed maturity securities available-for-sale at fair value (amortized cost of $82,907 and $64,977; allowance for credit losses of $98 and $75)		1,741		1,748
Collateral Received Fixed Maturity Securities [Member]
Investment Narrative [Line Items]
Fixed maturity securities available-for-sale at fair value (amortized cost of $82,907 and $64,977; allowance for credit losses of $98 and $75)		2,233		1,827
Carrying Value [Member]
Investment Narrative [Line Items]
Funds withheld at interest	[3]	$ 5,596		$ 6,005
CALIFORNIA
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total		12.40%
TEXAS
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total		9.60%
GEORGIA
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total		6.10%
CANADA
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total		7.00%
UNITED KINGDOM
Investment Narrative [Line Items]
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total		2.30%

[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, 2024, the fair value of such investments was $966 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, 2023, the fair value of such investments was $856 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.