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Investments - Narrative (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items] |  |  |
Accrued interest receivable | $ 413,000,000 |  | $ 365,000,000
FHLB collateral pledged | 3,830,000,000 |  | 3,387,000,000
Fixed maturity securities, available-for-sale securities, allowance for credit losses | 20,000,000 |  | 39,000,000
Allowance for credit loss for securities in an unrealized loss position | $ 0 |  |
DSC ratio, amortization period | 25 years |  |
Non-accrual loans | $ 72,000,000 |  | 71,000,000
Reinsurance agreement, recognized (losses) gains | $ (22,000,000) | $ 128,000,000 |
United States |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Residential mortgage loans, location percentage | 100.00% |  |
Commercial mortgage loans |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Commercial mortgage loans, percentage of investments | 6.00% |  |
Non-accrual loans | $ 9,000,000 |  | $ 9,000,000
Commercial mortgage loans | Mortgage loans |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance for expected credit loss, probability of loss/default model, projected loss, using reasonable forecast period | 2 years |  |
Allowance for credit loss, probability of loss/default, using market historical loss experience, period | 3 years |  |
Residential mortgage loans |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Residential mortgage loans, percentage of total investments | 6.00% |  | 5.00%
Non-accrual loans | $ 63,000,000 |  | $ 62,000,000
Residential mortgage loans | Mortgage loans |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Allowance for expected credit loss, probability of loss/default model, projected loss, using reasonable forecast period | 2 years |  |
Allowance for credit loss, probability of loss/default, using market historical loss experience, period | 3 years |  |
90 Days or more past due | Mortgage loans |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Loans in process of foreclosure | $ 32,000,000 |  | 38,000,000
Fixed maturity securities, available-for-sale |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Assets held by insurance regulators | $ 18,876,000,000 |  | $ 17,870,000,000

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