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Reserves For Losses (Details 1) - USD ($) $ in Millions | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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Card Member Loans And Related Reserves Evaluated Separately And Collectively For Impairment [Abstract] |  |  |
Card Member loans evaluated separately for impairment | $ 346 | $ 279 | $ 286
Reserves on Card Member loans evaluated separately for impairment | 60 | 53 | 67
Card Member loans evaluated collectively for impairment | 64,919 | 58,294 | 70,099
Reserves on Card Member loans evaluated collectively for impairment | $ 1,163 | $ 975 | $ 1,134

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- Definition Represents Card Member loans evaluated collectively for impairment. + References No definition available. + Details
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