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Business Combinations and Divestitures Business Acquisition, Pro Forma Information (Tables)
 12 Months Ended
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