Investments (Unconsolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Variable Interest Entity [Line Items]
Total Assets	$ 761,664	$ 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	75,374	70,409
Maximum Exposure to Loss	81,738	77,069
Variable Interest Entity, Not Primary Beneficiary | Fixed Maturity Securities
Variable Interest Entity [Line Items]
Total Assets	61,304	60,115
Maximum Exposure to Loss	61,304	60,115
Variable Interest Entity, Not Primary Beneficiary | Other limited partnership interests
Variable Interest Entity [Line Items]
Total Assets	12,218	8,355
Maximum Exposure to Loss	18,507	14,911
Variable Interest Entity, Not Primary Beneficiary | Other invested assets
Variable Interest Entity [Line Items]
Total Assets	1,181	1,320
Maximum Exposure to Loss	1,254	1,404
Variable Interest Entity, Not Primary Beneficiary | Other Investments
Variable Interest Entity [Line Items]
Total Assets	671	619
Maximum Exposure to Loss	$ 673	$ 639