Intangible Assets, Allocation of Goodwill to Operating Segments (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, Beginning Balance	$ 25,705	$ 25,637
Reduction in goodwill related to divested businesses and other	(179)	(19)
Goodwill from business combinations	3	87
Goodwill, Ending Balance (suppressed)	25,529	25,705
Community Banking [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	16,870	16,878
Reduction in goodwill related to divested businesses and other	(21)	(8)
Goodwill from business combinations	0	0
Goodwill, Ending Balance (suppressed)	16,849	16,870
Wholesale Banking [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	7,633	7,557
Reduction in goodwill related to divested businesses and other	(158)	(11)
Goodwill from business combinations	0	87
Goodwill, Ending Balance (suppressed)	7,475	7,633
Wealth and Investment Management [Member]
Goodwill [Roll Forward]
Goodwill, Beginning Balance	1,202	1,202
Reduction in goodwill related to divested businesses and other	0	0
Goodwill from business combinations	3	0
Goodwill, Ending Balance (suppressed)	$ 1,205	$ 1,202

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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- Definition

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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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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

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