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Investments - Mortgage Loans- ACL (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Loans serviced on behalf of third parties | $ 4,800 | $ 4,400 |  |
Financing Receivable, Modifications, Number of Contracts | 1 | 0 |  |
Commercial Loan [Member] |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Allowance for Credit Loss | $ 44 | $ 51 | $ 36 | $ 29
Financing Receivable, Credit Loss, Expense (Reversal) | (3) | 15 | 7 |
Financing Receivable, Allowance for Credit Loss, Writeoff | $ (4) | $ 0 | $ 0 |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 1.00% |  |  |
Commercial Loan [Member] | Extended Maturity |  |  |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |  |  |
Financing Receivable, Modified in Period, Amount | $ 9 |  |  |

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