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Loans and Accounts Receivable (Details 5) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Financing Receivable Impaired [Line Items] |  |
Average balance of impaired loans | $ 1,375 | $ 1,027
Interest income recognized | 37 | 31
Global Consumer Services Group [Member] | Card Member Loans [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average balance of impaired loans | 1,057 | 801
Interest income recognized | 31 | 26
Global Consumer Services Group [Member] | Card Member Receivables [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average balance of impaired loans | 45 | 27
Interest income recognized | 0 | 0
Global Commercial Services [Member] | Card Member Loans [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average balance of impaired loans | 181 | 136
Interest income recognized | 6 | 5
Global Commercial Services [Member] | Card Member Receivables [Member] |  |
Financing Receivable Impaired [Line Items] |  |
Average balance of impaired loans | 92 | 63
Interest income recognized | $ 0 | $ 0

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