Intangible Assets, Allocation of Goodwill to Operating Segments (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2012
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 25,637us-gaap_Goodwill	$ 25,637us-gaap_Goodwill
Reduction in goodwill related to divested businesses	(11)
Goodwill from business combinations	87us-gaap_GoodwillAcquiredDuringPeriod
Other	(8)us-gaap_GoodwillOtherChanges
Goodwill, Ending Balance (suppressed)	25,705us-gaap_Goodwill	25,637us-gaap_Goodwill
Community Banking [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	17,922	17,922
Reduction in goodwill related to divested businesses	0
Goodwill from business combinations	0
Other	(8)
Goodwill, Ending Balance (suppressed)	17,914	17,922
Wholesale Banking [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	7,344	7,344
Reduction in goodwill related to divested businesses	(11)
Goodwill from business combinations	87
Other	0
Goodwill, Ending Balance (suppressed)	7,420	7,344
Wealth Brokerage and Retirement [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	371	371
Reduction in goodwill related to divested businesses	0
Goodwill from business combinations	0
Other	0
Goodwill, Ending Balance (suppressed)	$ 371	$ 371

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

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Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

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Amount of other (increase) decrease of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

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- Definition

Amount of divestiture of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 20

-Section 50

-Paragraph 1

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