Leasing Activity, Leasing Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Income and Expenses, Lessor [Abstract]
Interest income on lease financing	$ 152	$ 181
Variable revenues on lease financing	30	26
Fixed revenues on operating leases	245	260
Variable revenues on operating leases	15	18
Other lease-related revenues	37	11
Noninterest income on leases	327	315
Total leasing revenue	479	496
Leasing Activity Disclosures Textual [Abstract]
Lease expense	$ 188	$ 226