Leasing Activity, Leasing Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income and Expenses, Lessor [Abstract]
Interest income on lease financing	$ 134	$ 169	$ 438	$ 522
Variable revenue on lease financing	28	25	85	76
Fixed revenue on operating leases	243	244	730	758
Variable revenue on operating leases	17	14	46	50
Other lease-related revenue	34	39	121	66
Noninterest income on leases	322	322	982	950
Total leasing revenue	456	491	1,420	1,472
Leasing Activity Disclosures Textual [Abstract]
Lease expense	$ 186	$ 220	$ 559	$ 672