Investments - Commercial Mortgage Loans (Details) - Real Estate Loan - Commercial Portfolio Segment $ in Millions	9 Months Ended
Sep. 30, 2025 USD ($)
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss	$ 1,258
Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio	1.72
Average Loan-to-Value Ratio	71.00%
Below 60%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss	$ 356
Below 60% \| Weighted Average
Schedule of Investments [Line Items]
Average Debt Service Coverage Ratio	2.13
60% to 79%
Schedule of Investments [Line Items]
Carrying value, after allowance for credit loss	$ 717
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	0.87

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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