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Related Party Transactions - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Related Party Transaction [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 13,873 |  | $ 13,873 |  | $ 3,192
Investment Management Fees |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party agreements and transactions |  |  |  | $ 31 |
Related Party |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Payments to acquire investments |  |  | $ 2,600 |  | 4,000
Related Party | North End Re (Cayman) SPC |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Modified coinsurance basis | 70.00% |  | 70.00% |  |
Coinsurance basis | 30.00% |  | 30.00% |  |
Related Party | Brookfield Treasury Management Inc |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 250 |  | $ 250 |  | 250
Interest income | 6 |  | 8 |  |
Related Party | Investment Management Fees |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Related party agreements and transactions | 40 | $ 11 | 85 |  |
Related Party | ANAT and BAMR US Holdings LLC Deposit Agreement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Cash and cash equivalents | 249 |  | 249 |  | 294
Related Party | ANTAC, LLC and BAMR US Holdings LLC Deposit Agreement |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |
Cash and cash equivalents | $ 189 |  | $ 189 |  | $ 181

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