Variable Interest Entities - Assets and Liabilities Related to Non-consolidated VIEs and Maximum Exposure to Losses (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Variable Interest Entity
Total Assets	$ 214,506	$ 214,574
Total Liabilities	195,488	195,402
Variable Interest Entity, Not Primary Beneficiary | CDC investments
Variable Interest Entity
Total Assets	1,999	2,007
Total Liabilities	665	690
Maximum Exposure	2,042	2,054
Variable Interest Entity, Not Primary Beneficiary | Private equity investments
Variable Interest Entity
Total Assets	240	230
Total Liabilities	0	0
Maximum Exposure	406	400
Variable Interest Entity, Not Primary Beneficiary | Loans provided to VIEs
Variable Interest Entity
Total Assets	4,286	4,274
Total Liabilities	0	0
Maximum Exposure	6,550	6,395
Variable Interest Entity, Not Primary Beneficiary | Lease pool entities
Variable Interest Entity
Total Assets	40	42
Total Liabilities	0	0
Maximum Exposure	40	42
Variable Interest Entity, Not Primary Beneficiary | Solar loan securitizations
Variable Interest Entity
Total Assets	9	9
Total Liabilities	0	0
Maximum Exposure	$ 9	$ 9