Investments (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Total Assets	$ 652,120	$ 663,072
Total Liabilities	626,225	632,947
Consolidated Entities [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	347	342
Total Liabilities	1	1
Investment funds (primarily other invested assets) | Consolidated Entities [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	276	266
Total Liabilities	1	1
Renewable energy partnership (primarily other invested assets) | Consolidated Entities [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	71	76
Total Liabilities	$ 0	$ 0