Other Assets - Schedule of Other Assets (Details) - USD ($) $ in Millions	Dec. 31, 2024	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Dec. 31, 2023	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022
Other Assets [Abstract]
Property and equipment at cost	$ 2,226				$ 2,153
Accumulated depreciation	(973)				(871)
Net property and equipment	1,253				1,282
Proportional amortization investments	2,131				1,866
Net deferred tax assets	1,916				1,247
Accrued interest, fees, and rent receivables	929				935
Nonmarketable equity investments	789				886
Restricted cash and cash equivalents	788				87
Equity-method investments	632				651
Goodwill	551				669				$ 822
Other accounts receivable	312				189
Restricted cash held for securitization trusts	300				407
Operating lease right-of-use assets	92				90
Net intangible assets	54				73
Other assets	913				1,036
Total other assets	$ 10,660	$ 9,947	$ 9,949	$ 9,420	$ 9,418	$ 9,612	$ 9,155	$ 9,142
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration]	Total other assets				Total other assets