Investments (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Total Assets	$ 677,576	$ 687,584
Total Liabilities	648,780	657,331
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	443	346
Total Liabilities	29	1
Investment funds (primarily other invested assets) | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	377	282
Total Liabilities	28	1
Renewable energy partnership (primarily other invested assets) | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	66	64
Total Liabilities	$ 1	$ 0