Premises, Equipment and Leasehold Improvements (Depreciation and Amortization Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Abstract]
Depreciation	$ 900	$ 899	$ 844
Amortization	138	130	122
Total depreciation And amortization	$ 1,038	$ 1,029	$ 966