Goodwill and Other Intangible Assets - Changes in Carrying Amounts Attributable to Operating Segments (Details) $ in Millions	9 Months Ended
Sep. 30, 2016 USD ($)
Goodwill [Roll Forward]
Goodwill, beginning balance	$ 8,548
Acquisitions	1,077
Other adjustments	2
Goodwill, ending balance	9,627
Community Banking
Goodwill [Roll Forward]
Goodwill, beginning balance	6,187
Acquisitions	755
Other adjustments	133
Goodwill, ending balance	7,075
Residential Mortgage Banking
Goodwill [Roll Forward]
Goodwill, beginning balance	326
Acquisitions	39
Other adjustments	0
Goodwill, ending balance	365
Dealer Financial Services
Goodwill [Roll Forward]
Goodwill, beginning balance	111
Acquisitions	0
Other adjustments	0
Goodwill, ending balance	111
Specialized Lending
Goodwill [Roll Forward]
Goodwill, beginning balance	243
Acquisitions	2
Other adjustments	(133)
Goodwill, ending balance	112
Insurance Holdings
Goodwill [Roll Forward]
Goodwill, beginning balance	1,482
Acquisitions	272
Other adjustments	0
Goodwill, ending balance	1,754
Financial Services
Goodwill [Roll Forward]
Goodwill, beginning balance	199
Acquisitions	9
Other adjustments	2
Goodwill, ending balance	$ 210

Amount of increase (decrease) from purchase accounting adjustments and other.

No definition available.

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- Definition

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.

+ 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

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

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

+ Details

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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

+ Details

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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.

+ Details

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