Investments (Unconsolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entity [Line Items]
Total Assets	$ 677,576	$ 687,584
Variable Interest Entity, Not Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	71,559	70,461
Maximum Exposure to Loss	76,542	76,103
Variable Interest Entity, Not Primary Beneficiary | Fixed Maturity Securities
Variable Interest Entity [Line Items]
Total Assets	55,920	54,182
Maximum Exposure to Loss	55,920	54,182
Variable Interest Entity, Not Primary Beneficiary | Other limited partnership interests
Variable Interest Entity [Line Items]
Total Assets	13,417	14,034
Maximum Exposure to Loss	18,289	19,591
Variable Interest Entity, Not Primary Beneficiary | Other invested assets
Variable Interest Entity [Line Items]
Total Assets	1,108	1,206
Maximum Exposure to Loss	1,203	1,275
Variable Interest Entity, Not Primary Beneficiary | Other Investments
Variable Interest Entity [Line Items]
Total Assets	1,114	1,039
Maximum Exposure to Loss	$ 1,130	$ 1,055