Premises, Equipment and Leasehold Improvements (Depreciation and Amortization Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment [Abstract]
Depreciation	$ 844	$ 791	$ 778
Amortization	122	115	109
Total depreciation And amortization	$ 966	$ 906	$ 887