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

Dec. 31, 2022

Dec. 31, 2021

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

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

$ 1,231

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

10,397

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

11,293

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

29,529

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

7,213

Available for Sale at Fair value - Amortized cost

59,663

$ 55,873

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

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

1,223

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

10,076

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

10,231

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

24,929

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

6,442

Fixed maturity securities available-for-sale

$ 52,901

^[1]

$ 60,749

^[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, 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.

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