Fair Value - Carrying Value and Fair Value Classified by Level (Details) - Nonrecurring - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Carrying Value
Assets:
Mortgage loans	$ 1,498	$ 1,505
Equity securities	515	490
Liabilities:
Investment contracts liabilities with a fixed maturity	1	1
Investment contracts liabilities without a fixed maturity	307	312
Long-term debt	63,451	64,151
Estimated Fair Value
Assets:
Mortgage loans	1,482	1,468
Liabilities:
Investment contracts liabilities with a fixed maturity	1	1
Investment contracts liabilities without a fixed maturity	268	272
Long-term debt	59,341	58,724
Level 1 \| Estimated Fair Value
Assets:
Mortgage loans	0	0
Liabilities:
Investment contracts liabilities with a fixed maturity	0	0
Investment contracts liabilities without a fixed maturity	0	0
Long-term debt	59,341	58,724
Level 2 \| Estimated Fair Value
Assets:
Mortgage loans	0	0
Liabilities:
Investment contracts liabilities with a fixed maturity	0	0
Investment contracts liabilities without a fixed maturity	0	0
Long-term debt	0	0
Level 3 \| Estimated Fair Value
Assets:
Mortgage loans	1,482	1,468
Liabilities:
Investment contracts liabilities with a fixed maturity	1	1
Investment contracts liabilities without a fixed maturity	268	272
Long-term debt	$ 0	$ 0

Investment Contracts With Fixed Maturity, Fair Value Disclosure.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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Amount of investment in equity security without readily determinable fair value.

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