Investments - Commercial Mortgage Loans (Details) - Real Estate Loan - Commercial Portfolio Segment $ in Millions	3 Months Ended
	Mar. 31, 2025 USD ($)
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss	$ 1,294
Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio	1.72
Average Loan-to-Value Ratio	69.00%
Below 60%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss	$ 503
Below 60% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio	2.05
60% to 79%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss	$ 628
60% to 79% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio	1.71
80% to 100%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss	$ 163
80% to 100% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio	0.88