Income Taxes - Deferred Tax Assets and Liabilities (Details 2) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred tax assets
Allowance for loan losses	$ 6,593	$ 8,712
Employee benefits	4,468	4,308
Allowance expenses and other	9,179	12,393
Non-U.S. operations	5,493	3,537
Tax attribute carryforwards	748	1,062
Gross deferred tax assets	26,481	30,012
Valuation allowance	(724)	(689)
Deferred tax assets, net of valuation allowance	25,757	29,323
Deferred tax liabilities
Depreciation and amortization	3,196	2,563
Mortgage servicing rights, net of hedges	5,882	5,336
Leasing transactions	2,352	2,242
Non-U.S operations	4,705	3,582
Other, net	3,459	4,340
Gross deferred tax liabilities	19,594	18,063
Net deferred tax assets	6,163	11,260
Internal Revenue Service (IRS) [Member]
Deferred Tax Assets and Liabilities - supplemental information
Non-U.S. subsidiary net operating loss carryforward	1,500
State and Local Jurisdiction [Member]
Deferred Tax Assets and Liabilities - supplemental information
Non-U.S. subsidiary net operating loss carryforward	156
Foreign Country [Member]
Deferred Tax Assets and Liabilities - supplemental information
Non-U.S. subsidiary net operating loss carryforward	$ 203