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Loans and Accounts Receivable (Details 5) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | $ 881 | $ 793 | $ 862 | $ 746
Interest income recognized | 26 | 22 | 74 | 60
U S Consumer Services [Member] | Card Member Loans [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | 636 | 587 | 626 | 555
Interest income recognized | 17 | 14 | 49 | 38
U S Consumer Services [Member] | Card Member Receivables [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | 20 | 13 | 19 | 13
Interest income recognized | 0 | 0 | 0 | 0
International Consumer and Network Services [Member] | Card Member Loans [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | 59 | 53 | 56 | 52
Interest income recognized | 4 | 4 | 12 | 12
Global Commercial Services [Member] | Card Member Loans [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | 122 | 111 | 119 | 102
Interest income recognized | 5 | 4 | 13 | 10
Global Commercial Services [Member] | Card Member Receivables [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | 44 | 29 | 42 | 24
Interest income recognized | $ 0 | $ 0 | $ 0 | $ 0

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