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Investments (Modifications to Borrowers Experiencing Financial Difficulty) (Details) - Commercial Mortgage Loans - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2024 | Mar. 31, 2023
Maximum |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Modified, Weighted Average Term Increase | Less than one year | Less than one year
Financing Receivable, Modified in Period, to Total Financing Receivables, Percentage | 1.00% | 100.00%
Extended Maturity |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Financing Receivable, Troubled Debt Restructuring, Postmodification | $ 80 | $ 64
Amortized Cost of Mortgage Loans Delinquent during the period | $ 182 |

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