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Loans and Card Member Receivables (Details 6) account in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) account | Dec. 31, 2019 USD ($) account | Dec. 31, 2018 USD ($) account
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts | account | 23 | 16 | 12
Aggregated outstanding balance upon payment default | $ | $ 188 | $ 106 | $ 57
Card Member Loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts | account | 17 | 12 | 8
Aggregated outstanding balance upon payment default | $ | $ 127 | $ 86 | $ 46
Card Member Receivables [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts | account | 3 | 4 | 4
Aggregated outstanding balance upon payment default | $ | $ 55 | $ 20 | $ 11
Other Loans [Member] |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts | account | 3 |  |
Aggregated outstanding balance upon payment default | $ | $ 6 |  |

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- Definition Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524 + Details
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- Definition Amount of financing receivable modified as troubled debt restructuring within previous 12 months, with subsequent payment default. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 34 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953682-111524 + Details
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