Goodwill and Intangible Assets - Additional Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 Mortgage Servicing Rights, Fair Value [Member]	Mar. 31, 2014 Mortgage Servicing Rights, Fair Value [Member]	Jun. 30, 2013 Mortgage Servicing Rights, Fair Value [Member]	Jun. 30, 2013 Mortgage Servicing Rights, Fair Value [Member]	Dec. 31, 2013 Mortgage Servicing Rights, Fair Value [Member]
Bank Servicing Fees	$ 45	$ 1	$ 99	$ 39	$ 81	$ 160	$ 77	$ 153
Qualitative and Quantitative Information, Transferor's Continuing Involvement, Principal Amount Outstanding					134,400				136,700
Principal Amount Outstanding of Loans Serviced For Third Parties					$ 105,400				$ 106,800

Principal Amount Outstanding of Loans Serviced for Third Parties

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- Definition

The total principal outstanding of financial assets transferred in a securitization, asset-backed financing arrangement, or similar transfer that has been accounted for as sales and in which the transferor continues to have involvement, including both the derecognized and recognized portion of such transferred assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 860

-SubTopic 20

-Section 50

-Paragraph 4

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=13989330&loc=d3e107314-111719

+ Details

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- Definition

Amount of revenue from servicing real estate mortgages, credit cards, and other financial assets held by others. Includes premiums received in lieu of regular servicing fees.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 13

-Article 9

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.13 (d))

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

+ Details

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