Fair Value - Carrying Value and Fair Value Classified by Level (Details) - Nonrecurring - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Carrying Value
Assets:
Mortgage loans	$ 1,402	$ 1,311
Equity securities	588	534
Liabilities:
Investment contracts liabilities with a fixed maturity	1	1
Investment contracts liabilities without a fixed maturity	322	312
Long-term debt	66,374	61,410
Estimated Fair Value
Assets:
Mortgage loans	1,356	1,274
Liabilities:
Investment contracts liabilities with a fixed maturity	1	1
Investment contracts liabilities without a fixed maturity	281	279
Long-term debt	60,840	58,451
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	60,840	58,451
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	1,356	1,274
Liabilities:
Investment contracts liabilities with a fixed maturity	1	1
Investment contracts liabilities without a fixed maturity	281	279
Long-term debt	$ 0	$ 0

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