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Loans and Accounts Receivable (Details 5) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | $ 1,147 | $ 881 | $ 1,086 | $ 862
Interest income recognized | 32 | 26 | 95 | 74
Global Consumer Services Group [Member] | Card Member Loans [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | 882 | 695 | 841 | 682
Interest income recognized | 27 | 21 | 79 | 61
Global Consumer Services Group [Member] | Card Member Receivables [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | 35 | 20 | 31 | 19
Interest income recognized | 0 | 0 | 0 | 0
Global Commercial Services [Member] | Card Member Loans [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | 153 | 122 | 144 | 119
Interest income recognized | 5 | 5 | 16 | 13
Global Commercial Services [Member] | Card Member Receivables [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | 77 | 44 | 70 | 42
Interest income recognized | $ 0 | $ 0 | $ 0 | $ 0

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