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Basis of Presentation (Details Textuals) - USD ($) $ in Millions | Jan. 01, 2019 | Sep. 30, 2019
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Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Right-of-use asset obtained in exchange for operating lease liability | $ 700 |
Minimum [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses net increase, Card Member loans and receivables (as a percentage) |  | 25.00%
Minimum [Member] | Card Member Loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses net increase, Card Member loans and receivables (as a percentage) |  | 55.00%
Maximum [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses net increase, Card Member loans and receivables (as a percentage) |  | 40.00%
Maximum [Member] | Card Member Loans [Member] |  |
Financing Receivable, Allowance for Credit Loss [Line Items] |  |
Allowance for credit losses net increase, Card Member loans and receivables (as a percentage) |  | 70.00%

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- Definition Amount of increase in right-of-use asset obtained in exchange for operating lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=77888399&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (g)(2) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918686-209980 + Details
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