Accumulated Other Comprehensive Income (Loss) (AOCI) - Reclassifications Out of AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Selling, General and Administrative Expense	$ (255)	$ (252)
Research and development expenses	(65)	(59)
Income (loss) from continuing operations	24	38
Income tax expense	(1)	(9)
Net income (loss) attributable to NCR common stockholders	17	24
Product
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	(391)	(453)
Service [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	(715)	(672)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income (loss) from continuing operations	(3)	(4)
Income tax expense	1	0
Net income (loss) attributable to NCR common stockholders	(2)	(4)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Product
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	(1)	(1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Service [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	(2)	(3)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Effective Cash Flow Hedge Loss (Gain)
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income (loss) from continuing operations	(1)	(1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Effective Cash Flow Hedge Loss (Gain) | Product
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	0	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Effective Cash Flow Hedge Loss (Gain) | Service [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	(1)	(1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of Prior Service Benefit
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income (loss) from continuing operations	(1)	(2)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of Prior Service Benefit | Product
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	0	0
Reclassification out of Accumulated Other Comprehensive Income [Member] | Amortization of Prior Service Benefit | Service [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	(1)	(2)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Changes in Fair Value of Effective Cash Flow Hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Income (loss) from continuing operations	(1)	(1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Changes in Fair Value of Effective Cash Flow Hedges | Product
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	(1)	(1)
Reclassification out of Accumulated Other Comprehensive Income [Member] | Changes in Fair Value of Effective Cash Flow Hedges | Service [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income on Derivatives [Line Items]
Cost of revenue	$ 0	$ 0