Goodwill and Other Intangible Assets (Mortgage Servicing Rights) (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014
Servicing Assets At Fair Value [Line Items]
Mortgage servicing rights, beginning balance	$ 1,351
Mortgage servicing rights, ending balance	1,558
Mortgage Servicing Rights [Member] \| Residential Mortgage [Member]
Servicing Assets At Fair Value [Line Items]
Mortgage servicing rights, beginning balance	845	$ 1,087
Mortgage servicing rights, ending balance	1,015	967
Unpaid principal balance of loans serviced for others at end of period	115,454	110,933
Mortgage Servicing Rights [Member] \| Residential Mortgage [Member] \| Time and Payoffs [Member]
Servicing Assets At Fair Value [Line Items]
Changes in Fair Value	(86)	(64)
Mortgage Servicing Rights [Member] \| Residential Mortgage [Member] \| Other [Member]
Servicing Assets At Fair Value [Line Items]
Changes in Fair Value	68	(116)
Mortgage Servicing Rights [Member] \| Residential Mortgage [Member] \| From loans sold with servicing retained [Member]
Servicing Assets At Fair Value [Line Items]
Additions	38	43
Mortgage Servicing Rights [Member] \| Residential Mortgage [Member] \| Purchases [Member]
Servicing Assets At Fair Value [Line Items]
Additions	150	17
Mortgage Servicing Rights [Member] \| Commercial Mortgage [Member]
Servicing Assets At Fair Value [Line Items]
Mortgage servicing rights, beginning balance	506	552
Mortgage servicing rights, ending balance	543	515
Unpaid principal balance of loans serviced for others at end of period	144,416	143,226
Mortgage Servicing Rights [Member] \| Commercial Mortgage [Member] \| Time and Payoffs [Member]
Servicing Assets At Fair Value [Line Items]
Changes in Fair Value	(43)	(45)
Mortgage Servicing Rights [Member] \| Commercial Mortgage [Member] \| Other [Member]
Servicing Assets At Fair Value [Line Items]
Changes in Fair Value	18	(25)
Mortgage Servicing Rights [Member] \| Commercial Mortgage [Member] \| From loans sold with servicing retained [Member]
Servicing Assets At Fair Value [Line Items]
Additions	34	17
Mortgage Servicing Rights [Member] \| Commercial Mortgage [Member] \| Purchases [Member]
Servicing Assets At Fair Value [Line Items]
Additions	$ 28	$ 16

Unpaid principal balance of residential mortgage loans serviced for others at period end.

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

+ Details

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- Definition

Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

+ Details

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- Definition

The net Increase or Decrease in fair value as a result of changes in the inputs, assumptions, or model used to calculate the fair value of servicing assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 50

-Section 50

-Paragraph 3

-Subparagraph (a)(4)(i)

-URI http://asc.fasb.org/extlink&oid=7882072&loc=d3e122625-111746

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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