Investments - Investments - VIEs (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Schedule of Investments [Line Items]
Variable Interest Entity, Primary Beneficiary, Maximum Loss Exposure, Amount	$ 0	$ 0
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount	2,800	2,600
Variable Interest Entity, Not Primary Beneficiary [Member]
Schedule of Investments [Line Items]
Variable Interest Entity, Reporting Entity Involvement, Commitments	$ 1,800	$ 1,800