Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Income Taxes [Abstract]
Deferred tax assets - Allowance for loan and lease losses	$ 637	$ 631
Deferred tax assets - Compensation and benefits	279	223
Deferred tax assets - Partnership investments	184	173
Deferred tax assets - Loss and credit carryforward	366	301
Deferred tax assets - Accrued expenses	207	284
Deferred tax assets - Other	193	131
Total gross deferred tax assets	1,866	1,743
Valuation allowance	(37)	(40)
Total deferred tax assets	1,829	1,703
Deferred tax liabilities - Leasing	1,169	1,034
Deferred tax liabilities - Goodwill and intangibles	196	197
Deferred tax liabilities - Fixed assets	379	206
Deferred tax liabilities - Mortgage Servicing Rights	179	146
Deferred tax liabilities - Net unrealized gains on securities and financial instruments		155
Deferred tax liabilities - BlackRock basis difference	1,726	1,594
Deferred tax liabilities - Other	119	345
Total deferred tax liabilities	3,768	3,677
Net deferred tax liability	$ 1,939	$ 1,974