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Business Combinations and Divestitures JetPay Pro Forma Information (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Business Acquisition, Pro Forma Revenue | $ 6,468 | $ 6,592
Business Acquisition, Pro Forma Net Income (Loss) | (46) | 217
Business Acquisition, Pro Forma Expenses Incremental Amortization Changes Attributable to Acquiree | 4 | 5
BusinessAcquisitionsProFormaExpensesTransactionsCosts | 4 | 4
Business Acquisition Pro Forma Expenses Incremental Interest Charges Attributable to Acquiree | $ 7 | $ 7

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