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Investments (Fixed Maturity Securities Pledged And Received As Collateral) (Details) - USD ($)
$ in Millions

Mar. 31, 2024

Dec. 31, 2023

Debt Securities, Available-for-sale [Line Items]

Available for Sale at Fair value - Amortized cost

$ 70,790

$ 64,977

Fixed maturity securities, available-for-sale

65,827

^[1]

60,467

^[2]

Collateral Fixed Maturity Securities [Member]

Debt Securities, Available-for-sale [Line Items]

Available for Sale at Fair value - Amortized cost

717

572

Fixed maturity securities, available-for-sale

631

517

Collateral Received Fixed Maturity Securities [Member]

Debt Securities, Available-for-sale [Line Items]

Fixed maturity securities, available-for-sale

1,932

1,827

Reported Value Measurement [Member]

Debt Securities, Available-for-sale [Line Items]

Assets Held-in-trust

33,402

32,758

Estimate of Fair Value Measurement [Member]

Debt Securities, Available-for-sale [Line Items]

Assets Held-in-trust

30,798

30,359

Deposits

Debt Securities, Available-for-sale [Line Items]

Available for Sale at Fair value - Amortized cost

12

12

Fixed maturity securities, available-for-sale

9

9

Federal Home Loan Bank Certificates and Obligations (FHLB)

Debt Securities, Available-for-sale [Line Items]

Available for Sale at Fair value - Amortized cost

63

63

Fixed maturity securities, available-for-sale

$ 63

$ 63

[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 March 31, 2024, the fair value of such investments was $893 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

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