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Investments - Narrative (Details) $ in Millions | 9 Months Ended |
--- | --- | ---
Sep. 30, 2021 USD ($) investment shares | Dec. 31, 2020 USD ($) shares
Debt Securities, Available-for-sale [Line Items] |  |
Accrued interest receivable | $ 255 | $ 235
FHLB collateral pledged | $ 2,278 | $ 1,622
Commercial mortgage loans, percentage of investments | 6.00% |
DSC ratio, amortization period | 25 years |
Number of investments | investment | 1 |
Cannae Holdings Inc. | Equity securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Investment owned, (in shares) | shares | 5,775,598 | 5,706,134
Investment owned, at fair value | $ 180 | $ 253
Residential mortgage loans |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of total investments | 100.00% | 100.00%
Loans over 90 days past due | $ 1,524 | $ 1,159
Over 90 days past due | Residential mortgage loans |  |
Debt Securities, Available-for-sale [Line Items] |  |
Loans over 90 days past due | 80 | 103
Loans in process of foreclosure | $ 48 | 24
United States |  |
Debt Securities, Available-for-sale [Line Items] |  |
Residential mortgage loans, location percentage | 100.00% |
Available-for-sale Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Assets held by insurance regulators | $ 21,198 | $ 16,714
Residential Mortgage |  |
Debt Securities, Available-for-sale [Line Items] |  |
Percentage of total investments | 4.00% |

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