Income Taxes (Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Income Taxes [Abstract]
Deferred tax assets - Allowance for loan and lease losses	$ 1,032	$ 1,250
Deferred tax assets - Compensation and benefits	654	822
Deferred tax assets - Partnership investments	295	247
Deferred tax assets - Loss and credit carryforward	502	545
Deferred tax assets - Accrued expenses	542	581
Deferred tax assets - Other	320	290
Total goss deferred tax assets	3,345	3,735
Valuation allowance	(61)	(65)
Total deferred tax assets	3,284	3,670
Deferred tax liabilities - Leasing	1,413	1,494
Deferred tax liabilities - Goodwill and intangibles	320	328
Deferred tax liabilities - Fixed assets	391	381
Deferred tax liabilities - Net unrealized gains on securities and financial instruments	453	619
Deferred tax liabilities - BlackRock basis difference	2,327	2,166
Deferred tax liabilities - Other	542	619
Total deferred tax liabilities	5,446	5,607
Net deferred tax liability	$ 2,162	$ 1,937