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Quarterly Financial Data (Details Textuals) - USD ($) | 3 Months Ended | 12 Months Ended
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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 |  |  |

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