Investments (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Total Assets	$ 704,976	$ 687,584
Total Liabilities	673,812	657,331
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	755	346
Total Liabilities	181	1
Investment funds (primarily other invested assets and REJV) | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	691	282
Total Liabilities	181	1
Renewable energy partnership (primarily other invested assets) | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	64	64
Total Liabilities	$ 0	$ 0