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Loans and Accounts Receivable (Details 7) pure in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts (in thousands) | 9 | 10 | 11
Aggregated Outstanding Balance Upon Payment Default | $ 46 | $ 45 | $ 57
Card Member Loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts (in thousands) | 6 | 7 | 8
Aggregated Outstanding Balance Upon Payment Default | $ 39 | $ 41 | $ 52
Card Member Receivables [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts (in thousands) | 3 | 3 | 3
Aggregated Outstanding Balance Upon Payment Default | $ 7 | $ 4 | $ 5

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- Definition Number of financing receivables that have been modified by troubled debt restructurings within the previous 12 months and for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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- Definition Amount of investment related to financing receivables modified by troubled debt restructurings within the previous 12 months, for which there was a payment default. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953682-111524 + Details
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