Goodwill and Intangible Assets (Details 1) (USD $) In Millions	Sep. 30, 2011	Dec. 31, 2010
Intangible Assets [Abstract]
Gross Carrying Value	$ 21,507	$ 21,522
Accumulated Amortization	12,743	11,599
Purchased credit card relationships [Member]
Intangible Assets [Abstract]
Gross Carrying Value	7,152	7,162
Accumulated Amortization	4,515	4,085
Core Deposits [Member]
Intangible Assets [Abstract]
Gross Carrying Value	5,394	5,394
Accumulated Amortization	4,331	4,094
Customer Relationships [Member]
Intangible Assets [Abstract]
Gross Carrying Value	4,229	4,232
Accumulated Amortization	1,540	1,222
Affinity Relationships [Member]
Intangible Assets [Abstract]
Gross Carrying Value	1,647	1,647
Accumulated Amortization	1,003	902
Other intangibles [Member]
Intangible Assets [Abstract]
Gross Carrying Value	3,085	3,087
Accumulated Amortization	$ 1,354	$ 1,296

Sum of the gross carrying amounts before accumulated amortization as of the balance sheet date of all intangible assets having statutory or estimated useful lives. The aggregate gross carrying amount (including any previously recognized impairment charges) of a major finite-lived intangible asset class. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 45

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16323-109275

Name:	us-gaap_FiniteLivedIntangibleAssetsGross
Namespace Prefix:	us-gaap
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant