Investments (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Mar. 31, 2022	Dec. 31, 2021
Variable Interest Entity [Line Items]
Total Assets	$ 724,284	$ 759,708
Total Liabilities	670,047	691,959
Consolidated Entities [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	374	372
Total Liabilities	2	1
Investment funds (primarily other invested assets) | Consolidated Entities [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	293	292
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	80	79
Total Liabilities	1	0
Other Investments | Consolidated Entities [Member] | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	1	1
Total Liabilities	$ 0	$ 0