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Description of Business and Significant Accounting Policies Description of Business and Significant Accounting Policies - Earnings Per Share (Basic) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Income (loss) from continuing operations         $ (35) $ 118 $ 97 $ 57 $ (36) $ 237 $ 283
Series A convertible preferred stock dividends                 (49) (47) (49)
Deemed dividend on modification of Series A convertible preferred stock                 0 (4) 0
Deemed dividend on preferred stock redemption                 0 (58) 0
Income (loss) from continuing operations attributable to common stockholders                 (85) 128 234
Income (loss) from discontinued operations, net of tax $ (14) $ (1) $ (2) $ (35) $ (10) $ 0 $ 5 $ 0 (52) (5) (13)
Net income (loss) attributable to NCR common stockholders                 $ (137) $ 123 $ 221
Basic (in shares)                 118.4 121.9 125.6
Basic (in dollars per share) $ (0.39) $ 0.62 $ (1.31) $ 0.36 $ (0.38) $ 0.87 $ 0.70 $ (0.14) $ (0.72) $ 1.05 $ 1.86
Income (Loss) from Discontinued Operations and Disposal of Discontinued Operations, Net of Tax, Per Basic Share                 (0.44) (0.04) (0.10)
Basic (in dollars per share) $ (0.51) $ 0.61 $ (1.33) $ 0.07 $ (0.46) $ 0.87 $ 0.74 $ (0.14) $ (1.16) $ 1.01 $ 1.76