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Loans and Card Member Receivables (Details 5) account in Thousands, $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) account | Dec. 31, 2020 USD ($) account | Dec. 31, 2019 USD ($) account
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts | account | 137 | 328 | 87
Account Balances | $ | $ 1,239 | $ 3,894 | $ 812
Card Member loans |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts | account | 112 | 272 | 78
Account Balances | $ | $ 789 | $ 2,347 | $ 602
Average Interest Rate Reduction (as a percent) | 13.00% | 14.00% | 13.00%
Card Member receivables |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts | account | 21 | 47 | 9
Account Balances | $ | $ 437 | $ 1,202 | $ 210
Average Payment Term Extension (in months) | 18 months | 19 months | 26 months
Other |  |  |
Financing Receivable, Modifications [Line Items] |  |  |
Number of Accounts | account | 4 | 9 |
Account Balances | $ | $ 13 | $ 345 |
Average Interest Rate Reduction (as a percent) | 3.00% | 3.00% |
Average Payment Term Extension (in months) | 16 months | 16 months |

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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- Definition Amount, before troubled debt restructuring, of financing receivable to be modified. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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