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Investments (Modifications to Borrowers Experiencing Financial Difficulty) (Details) - Commercial Mortgage Loans - USD ($) $ in Millions	12 Months Ended
	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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