Investments (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Total Assets	$ 674,266	$ 663,072
Total Liabilities	641,843	632,947
Consolidated Entities [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	342	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	270	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	72	76
Total Liabilities	$ 0	$ 0