Investments - Commercial Mortgage Loans (Details) - Real Estate Loan - Commercial Portfolio Segment $ in Millions	6 Months Ended
	Jun. 30, 2025 USD ($)
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss	$ 1,311
Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio	1.69
Average Loan-to-Value Ratio	70.00%
Below 60%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss	$ 422
Below 60% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio	2.02
60% to 79%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss	$ 704
60% to 79% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio	1.77
80% to 100%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss	$ 185
80% to 100% | Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio	0.83