Investments (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Total Assets	$ 662,893	$ 759,708
Total Liabilities	625,526	691,959
Consolidated Entities [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	353	372
Total Liabilities	9	1
Investment funds (primarily other invested assets) | Consolidated Entities [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	277	292
Total Liabilities	9	1
Renewable energy partnership (primarily other invested assets) | Consolidated Entities [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	75	79
Total Liabilities	0	0
Other Investments | Consolidated Entities [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	1	1
Total Liabilities	$ 0	$ 0