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Loans and Card Member Receivables (Details 1) - Card Member Receivables [Member] - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | $ 43,701 | $ 57,413 |  |
Financing receivables, reserves for credit losses | 267 | 619 | $ 573 | $ 521
Financing receivables, net | 43,434 | 56,794 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 4,296 | 8,284 |  |
Global Consumer Services Group [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 18,685 | 22,844 |  |
Global Consumer Services Group [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 0 | 8,300 |  |
Global Commercial Services [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | 25,016 | 34,569 |  |
Global Commercial Services [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Financing receivables, gross | $ 4,300 | $ 0 |  |

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