Condensed Consolidating Supplemental Guarantor Information - Narrative (Details)	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Dec. 19, 2013	Dec. 18, 2012	Sep. 17, 2012
5.00% Notes
Condensed Financial Statements, Captions [Line Items]
Debt stated interest rate	5.00%	5.00%			5.00%
4.625% Notes
Condensed Financial Statements, Captions [Line Items]
Debt stated interest rate	4.625%	4.625%		4.625%
5.875% Notes
Condensed Financial Statements, Captions [Line Items]
Debt stated interest rate	5.875%	5.875%	5.875%
6.375% Notes
Condensed Financial Statements, Captions [Line Items]
Debt stated interest rate	6.375%	6.375%	6.375%
Guarantor Subsidiary | NCR International, Inc.
Condensed Financial Statements, Captions [Line Items]
Ownership percentage on guarantor subsidiary	100.00%
Guarantor Subsidiary | NCR International, Inc. | 5.00% Notes
Condensed Financial Statements, Captions [Line Items]
Debt stated interest rate	5.00%
Guarantor Subsidiary | NCR International, Inc. | 4.625% Notes
Condensed Financial Statements, Captions [Line Items]
Debt stated interest rate	4.625%
Guarantor Subsidiary | NCR International, Inc. | 5.875% Notes
Condensed Financial Statements, Captions [Line Items]
Debt stated interest rate	5.875%
Guarantor Subsidiary | NCR International, Inc. | 6.375% Notes
Condensed Financial Statements, Captions [Line Items]
Debt stated interest rate	6.375%