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

Sep. 30, 2025

Dec. 31, 2024

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

Available for Sale at Fair value - Amortized cost

$ 104,461

$ 82,907

Fixed maturity securities, available-for-sale

99,573

^[1]

77,617

^[2]

Collateral Fixed Maturity Securities [Member]

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

Available for Sale at Fair value - Amortized cost

1,332

1,200

Fixed maturity securities, available-for-sale

1,139

1,046

Collateral Received Fixed Maturity Securities [Member]

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

Fixed maturity securities, available-for-sale

2,567

2,233

Reported Value Measurement [Member]

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

Assets Held-in-trust

65,836

47,162

Estimate of Fair Value Measurement [Member]

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

Assets Held-in-trust

63,181

44,473

Deposits

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

Available for Sale at Fair value - Amortized cost

10

10

Fixed maturity securities, available-for-sale

9

8

Federal Home Loan Bank Certificates and Obligations (FHLB)

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

Available for Sale at Fair value - Amortized cost

69

71

Fixed maturity securities, available-for-sale

$ 69

$ 71

[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 September 30, 2025, the fair value of such investments was $940 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, 2024, the fair value of such investments was $966 million

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The total amount of cash and securities held by third party trustees pursuant to terms of debt instruments or other agreements as of the date of each statement of financial position presented, which can be used by the trustee only to pay the noncurrent portion of specified obligations.

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