Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Deferred Tax Assets, Net [Abstract]
Net unrealized losses on securities and financial instruments	$ 2,417	$ 3,107
Allowance for loan and lease losses	1,147	1,152
Lease obligations	508	548
Compensation and benefits	261	369
Allowance for unfunded lending related commitments	161	170
Accrued expenses	209	78
Other	384	350
Total gross deferred tax assets	5,087	5,774
Valuation allowance	(26)	(27)
Total deferred tax assets	5,061	5,747
Deferred tax liabilities
Leasing	938	1,034
Fixed assets	477	589
Right of Use Assets	445	472
Mortgage servicing rights	359	325
Goodwill and intangibles	252	270
Other	461	405
Total deferred tax liabilities	2,932	3,095
Net deferred tax asset	$ 2,129	$ 2,652