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Investments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Accrued interest receivable | $ 278 | $ 253 |  |
FHLB collateral pledged | 2,840 | 2,469 |  |
Available for sale securities, allowance for credit losses | $ 11 | $ 8 | $ 7 | $ 19
Commercial mortgage loans, percentage of investments | 7.00% |  |  |
DSC ratio, amortization period | 25 years |  |  |
Cannae Holdings Inc. | Equity securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Investment owned, (in shares) | 4,775,598 | 5,775,598 |  |
Investment owned, at fair value | $ 114 | $ 203 |  |
Shares issued in exchange (in shares) | 1,000,000 |  |  |
Aggregate consideration received | $ 24 |  |  |
Residential mortgage loans |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Loans over 90 days past due | 2,010 | 1,606 |  |
Over 90 days past due | Residential mortgage loans |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Loans over 90 days past due | 63 | 72 |  |
Loans in process of foreclosure | $ 39 | 39 |  |
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 | $ 15,578 | $ 22,343 |  |
Residential Mortgage |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Percentage of total investments | 5.00% |  |  |

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