Investments (Unconsolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Total Assets	$ 687,584	$ 663,072
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	70,461	66,921
Maximum Exposure to Loss	76,103	72,663
Variable Interest Entity, Not Primary Beneficiary | Fixed Maturity Securities
Variable Interest Entity [Line Items]
Total Assets	54,182	51,422
Maximum Exposure to Loss	54,182	51,422
Variable Interest Entity, Not Primary Beneficiary | Other limited partnership interests
Variable Interest Entity [Line Items]
Total Assets	14,034	13,244
Maximum Exposure to Loss	19,591	18,906
Variable Interest Entity, Not Primary Beneficiary | Other invested assets
Variable Interest Entity [Line Items]
Total Assets	1,206	1,310
Maximum Exposure to Loss	1,275	1,387
Variable Interest Entity, Not Primary Beneficiary | Other Investments
Variable Interest Entity [Line Items]
Total Assets	1,039	945
Maximum Exposure to Loss	$ 1,055	$ 948