Investments (Unconsolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Total Assets	$ 773,253	$ 795,146
Tax Credits Guaranteed By Third Parties Amount That Reduces Maximum Exposure To Loss Related To Other Invested Assets	3	3
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	72,795	70,409
Maximum Exposure to Loss	79,137	77,069
Variable Interest Entity, Not Primary Beneficiary | Fixed Maturity Securities
Variable Interest Entity [Line Items]
Total Assets	60,152	60,115
Maximum Exposure to Loss	60,152	60,115
Variable Interest Entity, Not Primary Beneficiary | Other limited partnership interests
Variable Interest Entity [Line Items]
Total Assets	10,766	8,355
Maximum Exposure to Loss	17,029	14,911
Variable Interest Entity, Not Primary Beneficiary | Other invested assets
Variable Interest Entity [Line Items]
Total Assets	1,217	1,320
Maximum Exposure to Loss	1,293	1,404
Variable Interest Entity, Not Primary Beneficiary | Other Investments
Variable Interest Entity [Line Items]
Total Assets	660	619
Maximum Exposure to Loss	$ 663	$ 639