Derivatives Textuals (Details) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Derivatives (Textual) [Abstract]
Certain derivatives combined for designation as a hedge on a single instrument	$ 2,700,000,000		$ 2,700,000,000		$ 4,700,000,000
Derivative assets subject to enforceable master netting arrangements	61,200,000,000		61,200,000,000		68,900,000,000
Derivative liabilities subject to enforceable master netting arrangements	66,500,000,000		66,500,000,000		75,800,000,000
Valuation adjustments for derivative assets	311,000,000		311,000,000		352,000,000
Valuation adjustments for derivative liabilities	87,000,000		87,000,000		68,000,000
Cash collateral netted against derivative assets	5,400,000,000		5,400,000,000		5,000,000,000
Cash collateral netted against derivative liabilities	11,000,000,000		11,000,000,000		14,500,000,000
Fair Value Asset derivatives, net	17,870,000,000		17,870,000,000		23,816,000,000
Time value component recognized as net interest income (expense) on forward derivatives excluded from the assessment of hedge effectiveness	(1,000,000)	(1,000,000)	(4,000,000)	(2,000,000)
Deferred net gains on derivatives in other comprehensive income			309,000,000
Maximum length of time hedged in cash flow hedge			5 years
Change in value of derivatives excluded from assessment of cash flow hedge effectiveness	0	0	0	0
Gains (losses) on derivatives used to hedge residential mortgage servicing rights	(1,799,000,000)	2,008,000,000	(2,431,000,000)	2,108,000,000
Aggregate fair value of derivatives used for economic hedges net asset (liability)	(1,500,000,000)		(1,500,000,000)		87,000,000
Aggregate fair value of derivative loan commitments net asset (liability)	(615,000,000)		(615,000,000)		497,000,000
Aggregate fair value of derivative instruments with credit-risk-related contingent features, net liability	15,000,000,000		15,000,000,000		16,200,000,000
Collateral for derivative instruments with credit-risk-related contingent features	11,300,000,000		11,300,000,000		14,300,000,000
Additional collateral for derivative instruments with credit-risk-related contingent features	3,800,000,000		3,800,000,000		1,900,000,000
Derivative assets not subject to enforceable master netting arrangements	15,200,000,000		15,200,000,000		17,000,000,000
Derivative liabilities not subject to enforceable master netting arrangements	8,700,000,000		8,700,000,000		7,300,000,000
Trading assets [Member]
Derivatives (Textual) [Abstract]
Fair Value Asset derivatives, net	14,200,000,000		14,200,000,000		18,300,000,000
Other Assets [Member]
Derivatives (Textual) [Abstract]
Fair Value Asset derivatives, net	$ 3,700,000,000		$ 3,700,000,000		$ 5,500,000,000

The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 50

-Paragraph 4H

-Subparagraph (e)

-URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5624258-113959

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 44D

-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.