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Quarterly Financial Data (Details Textuals) - USD ($)	3 Months Ended									12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2012	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Quarterly Financial Data (Textuals) [Abstract]
Earnings allocated to participating share awards	$ 6,000,000	$ 9,000,000	$ 17,000,000	$ 11,000,000	$ 6,000,000	$ 10,000,000	$ 11,000,000	$ 11,000,000		$ 43,000,000	$ 38,000,000	$ 46,000,000
Restructuring Charges										875,000,000
Dividends Preferred Stock	$ 19,000,000	$ 21,000,000	$ 19,000,000	$ 21,000,000	$ 20,000,000	$ 22,000,000	$ 20,000,000	$ 0		$ 80,000,000	$ 62,000,000	$ 0
Periods in the prior year [Member]
Card Member reimbursements									$ 0
Periods prior to the prior year [Member]
Card Member reimbursements									$ 0

X

- Definition

Represents Card Member reimbursements for various types of transactions dating back several years related to fees, interest and bonus rewards as well as incremental expense related to the consent orders entered into with the Company's U.S. banking regulators.

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Quarterly Financial Data

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- Definition

Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise of stock options or restrictive stock units (RSUs).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
-SubTopic 10
-Section 50
-Paragraph 1
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Amount of paid and unpaid preferred stock dividends declared with the form of settlement in cash, stock and payment-in-kind (PIK).

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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