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Investments - Narrative (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2024 USD ($) loan | Jun. 30, 2023 USD ($) | Jun. 30, 2024 USD ($) loan | Jun. 30, 2023 USD ($) | Dec. 31, 2023 USD ($) loan
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Investment, non-income producing, greater than twelve months | $ 53,000,000 |  | $ 53,000,000 |  | $ 47,000,000
Accrued interest receivable | 531,000,000 |  | 531,000,000 |  | 481,000,000
FHLB collateral pledged | 4,886,000,000 |  | 4,886,000,000 |  | 4,345,000,000
Fixed maturity securities, available-for-sale securities, allowance for credit losses | 73,000,000 |  | 73,000,000 |  | $ 42,000,000
Allowance for credit loss for securities in an unrealized loss position | $ 0 |  | $ 0 |  |
Commercial mortgage loans, percentage of investments | 5.00% |  | 5.00% |  | 5.00%
DSC ratio, amortization period |  |  | 25 years |  |
Mortgage loans delinquent in principal or interest | loan | 0 |  | 0 |  |
Amortized cost of loans on non-accrual | $ 62,000,000 |  | $ 62,000,000 |  | $ 57,000,000
Loans in process of foreclosure | 63,000,000 |  | 63,000,000 |  | $ 41,000,000
Gross investment income | 855,000,000 | $ 680,000,000 | 1,636,000,000 | $ 1,354,000,000 |
Reinsurance agreement, recognized gains (losses) | 10,000,000 | 21,000,000 | (9,000,000) | (1,000,000) |
Funds Withheld, Reinsurance Agreements |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Gross investment income | 155,000,000 | $ 76,000,000 | $ 282,000,000 | $ 134,000,000 |
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] |  |  |  |  |
Mortgage loans delinquent in principal or interest | loan |  |  |  |  | 0
Charge offs |  |  | $ 0 |  | $ 3,000,000
Amortized cost of loans on non-accrual | $ 0 |  | $ 0 |  | $ 0
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 | 5.00% |  | 5.00% |  | 5.00%
Charge offs |  |  | $ 0 |  | $ 0
Amortized cost of loans on non-accrual | $ 62,000,000 |  | $ 62,000,000 |  | 57,000,000
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 |  |
Fixed maturity securities, available-for-sale |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |
Assets held by insurance regulators | $ 146,000,000 |  | $ 146,000,000 |  | $ 141,000,000

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