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Fair Value - Carrying Value and Fair Value Classified by Level (Details) - Nonrecurring - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Carrying Value |  |
Assets: |  |
Mortgage loans | $ 976 | $ 1,047
Equity securities | 129 | 145
Liabilities: |  |
Investment contracts liabilities with a fixed maturity | 5 | 5
Investment contracts liabilities without a fixed maturity | 324 | 322
Long-term debt | 59,354 | 64,647
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 | 68,364 | 75,940
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 | 992 | 1,070
Liabilities: |  |
Investment contracts liabilities with a fixed maturity | 5 | 5
Investment contracts liabilities without a fixed maturity | 363 | 371
Long-term debt | 0 | 0
Total | Estimated Fair Value |  |
Assets: |  |
Mortgage loans | 992 | 1,070
Liabilities: |  |
Investment contracts liabilities with a fixed maturity | 5 | 5
Investment contracts liabilities without a fixed maturity | 363 | 371
Long-term debt | $ 68,364 | $ 75,940

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