Investments (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Total Assets	$ 702,470	$ 677,457
Total Liabilities	674,543	649,754
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	785	692
Total Liabilities	165	143
Investment funds (primarily other invested assets) | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	731	635
Total Liabilities	165	143
Renewable energy partnership (primarily other invested assets) | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	54	57
Total Liabilities	$ 0	$ 0