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Fair Value - Carrying Value and Fair Value Classified by Level (Details) - Nonrecurring - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Carrying Value |  |
Assets: |  |
Mortgage loans | $ 1,487 | $ 1,311
Equity securities | 602 | 534
Liabilities: |  |
Investment contracts liabilities with a fixed maturity | 1 | 1
Investment contracts liabilities without a fixed maturity | 316 | 312
Long-term debt | 64,734 | 61,410
Estimated Fair Value |  |
Assets: |  |
Mortgage loans | 1,478 | 1,274
Liabilities: |  |
Investment contracts liabilities with a fixed maturity | 1 | 1
Investment contracts liabilities without a fixed maturity | 286 | 279
Long-term debt | 61,923 | 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 | 61,923 | 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 | 1,478 | 1,274
Liabilities: |  |
Investment contracts liabilities with a fixed maturity | 1 | 1
Investment contracts liabilities without a fixed maturity | 286 | 279
Long-term debt | $ 0 | $ 0

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