Goodwill and Other Intangible Assets (Identifiable Intangible Assets) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Acquired Finite Lived Intangible Assets [Line Items]
Gross carrying amount	$ 1,781	$ 1,754
Accumulated amortization	(1,276)	(1,185)
Net carrying amount	505us-gaap_FiniteLivedIntangibleAssetsNet	569us-gaap_FiniteLivedIntangibleAssetsNet
Core Deposit Intangibles [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average remaining life	6 years 10 months
Gross carrying amount	693	672
Accumulated amortization	(585)	(555)
Net carrying amount	108	117
Other Identifiable Intangible Assets [Member]
Acquired Finite Lived Intangible Assets [Line Items]
Weighted-average remaining life	14 years 8 months
Gross carrying amount	1,088	1,082
Accumulated amortization	(691)	(630)
Net carrying amount	$ 397	$ 452

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Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

+ Details

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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)(1)

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

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

+ Details

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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