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Description of Business and Significant Accounting Policies - Earnings Per Share (Diluted) (Details) - USD ($) $ / shares in Units, shares in Millions | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Earnings Per Share Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | $ 384,000,000 | $ 105,000,000 | $ 88,000,000 | $ 37,000,000 | $ (33,000,000) | $ 85,000,000 | $ (143,000,000) | $ 55,000,000 | $ 614,000,000 | $ (36,000,000) | $ 237,000,000
Preferred Stock Dividends Income Statement Impact Included in Diluted Earnings Per Share From Continuing Operations |  |  |  |  |  |  |  |  | 76,000,000 |  |
Net Income (Loss) from Continuing Operations Available to Common Shareholders, Diluted |  |  |  |  |  |  |  |  | 538,000,000 | (85,000,000) | 128,000,000
Income (loss) from discontinued operations, net of tax | $ (35,000,000) | $ (15,000,000) | $ 0 | $ 0 | $ (14,000,000) | $ (1,000,000) | $ (2,000,000) | $ (35,000,000) | (50,000,000) | (52,000,000) | (5,000,000)
Net income (loss) attributable to NCR common stockholders |  |  |  |  |  |  |  |  | $ 488,000,000 | $ (137,000,000) | $ 123,000,000
Weighted average outstanding shares of common stock |  |  |  |  |  |  |  |  | 122.1 | 118.4 | 121.9
Incremental Common Shares Attributable to Dilutive Effect of Conversion of Preferred Stock |  |  |  |  |  |  |  |  | 19.5 | 0.0 | 0.0
Dilutive effect of employee stock options and restricted stock |  |  |  |  |  |  |  |  | 3.6 | 0.0 | 5.1
Weighted Average Number of Shares Outstanding, Diluted |  |  |  |  |  |  |  |  | 145.2 | 118.4 | 127.0
Diluted earnings (loss) per share [Abstract] |  |  |  |  |  |  |  |  |  |  |
Diluted (in dollars per share) | $ 2.67 | $ 0.21 | $ 0.58 | $ 0.20 | $ (0.39) | $ 0.57 | $ (1.31) | $ 0.35 | $ 3.71 | $ (0.72) | $ 1.01
From discontinued operations (in dollars per share) |  |  |  |  |  |  |  |  | (0.35) | (0.44) | (0.04)
Diluted (in dollars per share) | $ 2.43 | $ 0.09 | $ 0.58 | $ 0.20 | $ (0.51) | $ 0.56 | $ (1.33) | $ 0.06 | $ 3.36 | $ (1.16) | $ 0.97
Series A Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  | 5.7 | 28.3 | 27.4
Restricted Stock Units (RSUs) and Stock Options [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  | 4.3 | 5.6 |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items] |  |  |  |  |  |  |  |  |  |  |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount |  |  |  |  |  |  |  |  |  |  | 0.8

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