Leases - Operating Lease Income and Related Depreciation Expense (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Leases [Abstract]
Operating Lease, Lease Income, Statement of Income or Comprehensive Income [Extensible Enumeration]	Noninterest Income, Other	Noninterest Income, Other	Noninterest Income, Other	Noninterest Income, Other
Operating lease income	$ 945	$ 1,277	$ 1,993	$ 2,602
Depreciation expense	$ 668	$ 876	$ 1,379	$ 1,809