Leasing Activity, Leasing Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Income and Expenses, Lessor [Abstract]
Interest income on lease financing	$ 233	$ 188	$ 672	$ 533
Variable revenue on lease financing	23	25	69	74
Fixed revenue on operating leases	226	241	694	735
Variable revenue on operating leases	13	9	35	33
Other lease-related revenue	15	16	192	103
Noninterest income on leases	277	291	990	945
Total leasing revenue	510	479	1,662	1,478
Leasing Activity Disclosures Textual [Abstract]
Lease expense	$ 152	$ 172	$ 475	$ 529