Investments (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Variable Interest Entity [Line Items]
Total Assets	$ 688,316	$ 677,457
Total Liabilities	660,561	649,754
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	766	692
Total Liabilities	134	143
Investment funds (primarily other invested assets) | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	707	635
Total Liabilities	133	143
Renewable energy partnership (primarily other invested assets) | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	59	57
Total Liabilities	$ 1	$ 0