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Investments (Modifications to Borrowers Experiencing Financial Difficulty) (Details) - Commercial Mortgage Loans - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Modified, Weighted Average Term Increase | 2 years |
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 1.10% | 1.00%
FinancingReceivableModifiedWeightedAverageInterestRateBeforeModificationDuringPeriod | 7.6 |
FinancingReceivableModifiedWeightedAverageInterestRateAfterModificationDuringPeriod | 6.5 |
Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Modified, Weighted Average Term Increase |  | Less than one year
Extended Maturity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | $ 641 | $ 522
Extended Maturity | Contractual Interest Rate Reduction |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | $ 206 |

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