Variable Interest Entities - Assets and Liabilities Related to Non-consolidated VIEs and Maximum Exposure to Losses (Details) - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Variable Interest Entity
Total Assets	$ 212,903	$ 212,927
Total Liabilities	191,796	193,282
Variable Interest Entity, Not Primary Beneficiary | CDC investments
Variable Interest Entity
Total Assets	2,295	2,179
Total Liabilities	741	741
Maximum Exposure	2,344	2,224
Variable Interest Entity, Not Primary Beneficiary | Private equity investments
Variable Interest Entity
Total Assets	313	268
Total Liabilities	0	0
Maximum Exposure	571	487
Variable Interest Entity, Not Primary Beneficiary | Loans provided to VIEs
Variable Interest Entity
Total Assets	4,755	4,711
Total Liabilities	0	0
Maximum Exposure	8,155	7,529
Variable Interest Entity, Not Primary Beneficiary | Lease pool entities
Variable Interest Entity
Total Assets	22	30
Total Liabilities	0	0
Maximum Exposure	22	30
Variable Interest Entity, Not Primary Beneficiary | Solar loan securitizations
Variable Interest Entity
Total Assets	7	8
Total Liabilities	0	0
Maximum Exposure	$ 7	$ 8