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Quarterly Financial Data (Details Textuals) - USD ($)	3 Months Ended									12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2012	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Data (Textuals) [Abstract]
Earnings allocated to participating share awards	$ 6,000,000	$ 10,000,000	$ 11,000,000	$ 11,000,000	$ 11,000,000	$ 11,000,000	$ 12,000,000	$ 12,000,000		$ 38,000,000	$ 46,000,000	$ 47,000,000
Dividends Preferred Stock	$ 20,000,000	$ 22,000,000	$ 20,000,000	$ 0						$ 62,000,000	$ 0	$ 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
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 405
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6957935&loc=d3e64057-112817

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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