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Business Combinations and Divestitures Business Acquisition, Pro Forma Information (Tables) | 12 Months Ended
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Dec. 31, 2019
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |
Business Acquisition, Pro Forma Information [Table Text Block] | The unaudited pro forma consolidated results of operations, assuming the acquisition had occurred on January 1, 2017, are as follows:
In millions |  | 2018 |  | 2017
Revenue |  | $ | 6,468 |  |  | $ | 6,592 |
Net income attributable to NCR |  | $ | (46 | ) |  | $ | 217 |

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- Definition Tabular disclosure of pro forma results of operations for a material business acquisition or series of individually immaterial business acquisitions that are material in the aggregate. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463 + Details
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