Goodwill and Other Intangible Assets - Future Amortization Expense (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2015	$ 166
2016	126
2017	110
2018	78
2019	42
Purchased credit card relationships
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2015	13
2016	6
2017	5
2018	3
2019	2
Other credit card-related intangibles
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2015	38
2016	33
2017	28
2018	20
2019	0
Core deposit intangibles
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2015	26
2016	14
2017	7
2018	5
2019	3
Other intangibles
Estimated future amortization expense related to credit card relationships, core deposits and other intangible assets [Abstract]
2015	89
2016	73
2017	70
2018	50
2019	$ 37

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

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