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Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) - USD ($)
$ in Millions

Dec. 31, 2023

Dec. 31, 2022

Available-for-sale Securities, Debt Maturities, Amortized Cost Basis [Abstract]

Available-for-sale Securities, Debt Maturities, within One Year, Amortized Cost Basis

$ 1,587

Available-for-sale Securities, Debt Maturities, after One Through Five Years, Amortized Cost Basis

11,517

Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Amortized Cost Basis

11,224

Debt Securities, Available-for-sale, Allocated and Single Maturity Date, Maturity, after 10 Years, Amortized Cost

32,846

Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Amortized Cost

7,803

Available for Sale at Fair value - Amortized cost

64,977

$ 59,663

Available-for-sale Securities, Debt Maturities, Fair Value [Abstract]

Available-for-sale Securities, Debt Maturities, within One Year, Fair Value

1,595

Available-for-sale Securities, Debt Maturities, after One Through Five Years, Fair Value

11,294

Available-for-sale Securities, Debt Maturities, after Five Through Ten Years, Fair Value

10,637

Debt Securities, Available-for-sale, Maturity, Allocated and Single Maturity Date, after 10 Years, Fair Value

29,660

Debt Securities, Available-for-sale, Maturity, without Single Maturity Date, Fair Value

7,281

Fixed maturity securities available-for-sale

$ 60,467

^[1]

$ 52,901

^[2]

[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, 2023, the fair value of such investments was $856 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, 2022, the fair value of such investments was $683 million.

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