Discontinued Operations - Additional Information (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets of discontinued operations	$ 21,000,000	$ 63,000,000
Liabilities of discontinued operations	59,000,000	71,000,000
Commercial Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets of discontinued operations	21,000,000	62,000,000
Liabilities of discontinued operations	(4,000,000)	0
Card and Retail Services [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Assets of discontinued operations	0	1,000,000
Liabilities of discontinued operations	63,000,000	71,000,000
Minimum [Member] \| Card and Retail Services [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Portion of reasonable possible loss not accrued for	0
Maximum [Member] \| Card and Retail Services [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Portion of reasonable possible loss not accrued for	$ 500,000,000

Amount classified as assets attributable to disposal group held for sale or disposed of.

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Amount classified as liabilities attributable to disposal group held for sale or disposed of.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

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The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date.

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 450

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-Section 05

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