Derivatives Textuals (Details) (USD $)	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Derivatives (Textual) [Abstract]
Notional Basis swaps combined with receive fixed rate/pay floating rate swaps	$ 2,700,000,000		$ 4,700,000,000
Derivative assets subject to enforceable master netting arrangements	61,900,000,000		68,900,000,000
Derivative liabilities subject to enforceable master netting arrangements	68,100,000,000		75,800,000,000
Valuation adjustments for derivative assets	288,000,000		352,000,000
Valuation adjustments for derivative liabilities	69,000,000		68,000,000
Cash collateral netted against derivative assets	6,600,000,000		5,000,000,000
Cash collateral netted against derivative liabilities	13,600,000,000		14,500,000,000
Fair Value Asset derivatives, net	16,916,000,000		23,816,000,000
Gains (losses) on forward derivatives hedging	(3,000,000)	(1,000,000)
Deferred net gains on derivatives in other comprehensive income	416,000,000
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
Gains (losses) on derivatives used to hedge residential mortgage servicing rights	(632,000,000)	100,000,000
Aggregate fair value of derivatives used for economic hedges net asset liability	113,000,000		87,000,000
Aggregate fair value of derivative loan commitments net asset liability	415,000,000		497,000,000
Aggregate fair value of derivative instruments with credit-risk-related contingent features, net liability	15,100,000,000		16,200,000,000
Collateral for derivative instruments with credit-risk-related contingent features	12,800,000,000		14,300,000,000
Additional collateral for derivative instruments with credit-risk-related contingent features	2,200,000,000		1,900,000,000
Trading assets [Member]
Derivatives (Textual) [Abstract]
Fair Value Asset derivatives, net	15,100,000,000		18,300,000,000
Other Assets [Member]
Derivatives (Textual) [Abstract]
Fair Value Asset derivatives, net	$ 1,900,000,000		$ 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.