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Reserves For Losses (Details Textuals) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Allowance for Card Member Receivables, Recoveries of Bad Debts | $ 359 | $ 391 | $ 401
Allowance for Card Member Loans, Recoveries of Bad Debts | 409 | 379 | 418
Allowance for Card Member Receivables, Recoveries of Bad Debts - TDR | (2) | 16 | 60
Allowance for Card Member Loans, Recoveries of Bad Debts - TDR | 30 | 34 | 41
Loans Transferred From Held For Sale To Held For Investment |  | 265 |
Cardmember Reserves For Loans Held For Investments |  | 67 |
Foreign Currency Translation Adjustments [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Card Member receivable reserves for losses - Other | 12 | (12) | (16)
Card Member loans reserves for losses - other | 8 | (10) | (20)
Other Items [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Card Member receivable reserves for losses - Other | (17) | (5) | (11)
Card Member loans reserves for losses - other | $ 15 | $ 8 | $ 10

X
- Definition Amount of recovery of Card Member loans related to troubled debt restructurings, which had previously been fully or partially written-off as bad debts. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

X
- Definition Amount of recovery of Card Member receivables related to troubled debt restructurings, which had previously been fully or partially written-off as bad debts. + References No definition available. + Details
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X
- Definition Amount of Card Member reserves associated with Card Member loans held for investments + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
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X
- Definition Card Member loans transferred from Held for Sales (HFS) to held for Investment + References No definition available. + Details
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X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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X
- Definition Amount of recoveries of receivables doubtful of collection that were previously charged off. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration

X
- Definition Amount of direct write-downs of accounts receivable charged against the allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 310 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=68075217&loc=SL9156395-115594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.4) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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X
- Definition Amount of recovery of loans and lease receivables which had previously been fully or partially written-off as bad debts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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X
- Definition Amount, after recoveries, of loans and leases that have been written-off. + References No definition available. + Details
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- Details
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- Details
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