Investments (Consolidated Variable Interest Entities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Variable Interest Entity [Line Items]
Total Assets	$ 687,584	$ 663,072
Total Liabilities	657,331	632,947
Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	346	342
Total Liabilities	1	1
Investment funds (primarily other invested assets) | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	282	266
Total Liabilities	1	1
Renewable energy partnership (primarily other invested assets) | Variable Interest Entity, Primary Beneficiary
Variable Interest Entity [Line Items]
Total Assets	64	76
Total Liabilities	$ 0	$ 0