Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Deferred Tax Assets, Net [Abstract]
Allowance for loan and lease losses	$ 1,288	$ 661
Allowance for unfunded commitments	141	78
Compensation and benefits	227	270
Partnership investments	121	120
Loss and credit carryforward	162	203
Accrued expenses	107	117
Lease obligations	528	545
Other	163	161
Total gross deferred tax assets	2,737	2,155
Valuation allowance	(26)	(31)
Total deferred tax assets	2,711	2,124
Deferred Tax Liabilities, Gross [Abstract]
Leasing	1,179	1,183
Right of Use Assets	476	520
Goodwill and intangibles	193	194
Fixed assets	592	412
Net unrealized gains on securities and financial instruments	929	370
Other	143	306
Total deferred tax liabilities	3,512	2,985
Net deferred tax liability	$ 801	$ 861