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Loans and Accounts Receivable (Details 5) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | $ 1,098 | $ 853 | $ 1,056 | $ 846
Interest income recognized | 32 | 24 | 63 | 48
Global Consumer Services Group [Member] | Card Member Loans [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | 846 | 674 | 819 | 671
Interest income recognized | 26 | 20 | 52 | 40
Global Consumer Services Group [Member] | Card Member Receivables [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | 31 | 18 | 29 | 18
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 | 149 | 120 | 141 | 117
Interest income recognized | 6 | 4 | 11 | 8
Global Commercial Services [Member] | Card Member Receivables [Member] |  |  |  |
Financing Receivable Impaired [Line Items] |  |  |  |
Average balance of impaired loans | 72 | 41 | 67 | 40
Interest income recognized | $ 0 | $ 0 | $ 0 | $ 0

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