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Reserves for Losses (Details 3) - Card Member Receivables Evaluated Separately And Collectively For Impairment [Member] - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
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Card Member Receivables And Related Reserves Evaluated Separately and Collectively For Impairment [Line Items] |  |
Card Member receivables evaluated separately for impairment | $ 116 | $ 80
Reserves on Card Member receivables evaluated separately for impairment | 5 | 3
Card Member receivables evaluated collectively for impairment | 55,400 | 53,967
Reserves on Card Member receivables evaluated collectively for impairment | $ 539 | $ 518

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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + 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 (g) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables that were collectively evaluated for impairment. + 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 (h) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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