Condensed Consolidating Supplemental Guarantor Information - Balance Sheet (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Current assets
Cash and cash equivalents	$ 1,214	$ 509	$ 414
Accounts receivable, net	1,353	1,490
Inventories	747	784
Due from affiliates	0	0
Other current assets	463	361
Total current assets	3,777	3,144
Property, plant and equipment, net	399	413
Goodwill	2,821	2,832
Intangibles, net	580	607
Operating lease assets	362	391
Prepaid pension cost	176	178
Deferred Income Taxes and Other Assets, Noncurrent	808	821
Investments in subsidiaries	0	0
Due from affiliates	0	0
Other assets	632	601
Total assets	9,555	8,987
Current liabilities
Short-term borrowings	304	282
Accounts payable	790	840
Payroll and benefits liabilities	186	308
Contract with Customer, Liability, Current	616	502
Contract with Customer, Liability, Noncurrent	75	81
Due to affiliates	0	0
Other current liabilities	510	606
Total current liabilities	2,406	2,538
Long-term debt	4,081	3,277
Pension and indemnity plan liabilities	855	858
Postretirement and postemployment benefits liabilities	112	111
Income tax accruals	89	92
Due to affiliates	0	0
Operating lease liabilities	346	369
Other liabilities	244	240
Total liabilities	8,133	7,485
Redeemable noncontrolling interest	0	0
Series A convertible preferred stock	395	395
Stockholders’ equity
Total NCR stockholders’ equity	1,024	1,104
Noncontrolling interests in subsidiaries	3	3
Total stockholders’ equity	1,027	1,107
Total liabilities and stockholders’ equity	9,555	8,987
Eliminations
Current assets
Cash and cash equivalents	0	0	0
Accounts receivable, net	0	0
Inventories	0	0
Due from affiliates	(4,865)	(3,657)
Other current assets	0	0
Total current assets	(4,865)	(3,657)
Property, plant and equipment, net	0	0
Goodwill	0	0
Intangibles, net	0	0
Operating lease assets	0	0
Prepaid pension cost	0	0
Deferred Income Taxes and Other Assets, Noncurrent	0	0
Investments in subsidiaries	(8,077)	(8,056)
Due from affiliates	(91)	(91)
Other assets	0	0
Total assets	(13,033)	(11,804)
Current liabilities
Short-term borrowings	0	0
Accounts payable	0	0
Payroll and benefits liabilities	0	0
Contract with Customer, Liability, Current	0	0
Due to affiliates	(4,865)	(3,657)
Other current liabilities	0	0
Total current liabilities	(4,865)	(3,657)
Long-term debt	0	0
Pension and indemnity plan liabilities	0	0
Postretirement and postemployment benefits liabilities	0	0
Income tax accruals	0	0
Due to affiliates	(91)	(91)
Operating lease liabilities	0	0
Other liabilities	0	0
Total liabilities	(4,956)	(3,748)
Redeemable noncontrolling interest	0	0
Series A convertible preferred stock	0	0
Stockholders’ equity
Total NCR stockholders’ equity	(8,077)	(8,056)
Noncontrolling interests in subsidiaries	0	0
Total stockholders’ equity	(8,077)	(8,056)
Total liabilities and stockholders’ equity	(13,033)	(11,804)
Parent Issuer
Current assets
Cash and cash equivalents	945	15	21
Accounts receivable, net	77	54
Inventories	236	315
Due from affiliates	853	909
Other current assets	220	122
Total current assets	2,331	1,415
Property, plant and equipment, net	265	280
Goodwill	2,186	2,183
Intangibles, net	456	471
Operating lease assets	238	254
Prepaid pension cost	0	0
Deferred Income Taxes and Other Assets, Noncurrent	331	335
Investments in subsidiaries	4,119	4,118
Due from affiliates	16	16
Other assets	563	527
Total assets	10,505	9,599
Current liabilities
Short-term borrowings	9	8
Accounts payable	357	427
Payroll and benefits liabilities	88	188
Contract with Customer, Liability, Current	336	245
Due to affiliates	2,963	2,730
Other current liabilities	218	261
Total current liabilities	3,971	3,859
Long-term debt	4,078	3,199
Pension and indemnity plan liabilities	590	586
Postretirement and postemployment benefits liabilities	16	17
Income tax accruals	30	29
Due to affiliates	0	0
Operating lease liabilities	269	282
Other liabilities	132	128
Total liabilities	9,086	8,100
Redeemable noncontrolling interest	0	0
Series A convertible preferred stock	395	395
Stockholders’ equity
Total NCR stockholders’ equity	1,024	1,104
Noncontrolling interests in subsidiaries	0	0
Total stockholders’ equity	1,024	1,104
Total liabilities and stockholders’ equity	10,505	9,599
Guarantor Subsidiary
Current assets
Cash and cash equivalents	3	3	3
Accounts receivable, net	1	1
Inventories	1	1
Due from affiliates	2,218	2,217
Other current assets	1	1
Total current assets	2,224	2,223
Property, plant and equipment, net	0	0
Goodwill	0	0
Intangibles, net	0	0
Operating lease assets	0	0
Prepaid pension cost	0	0
Deferred Income Taxes and Other Assets, Noncurrent	2	2
Investments in subsidiaries	3,958	3,938
Due from affiliates	1	1
Other assets	1	1
Total assets	6,186	6,165
Current liabilities
Short-term borrowings	0	0
Accounts payable	0	0
Payroll and benefits liabilities	0	0
Contract with Customer, Liability, Current	1	1
Due to affiliates	109	108
Other current liabilities	1	1
Total current liabilities	111	110
Long-term debt	0	0
Pension and indemnity plan liabilities	0	0
Postretirement and postemployment benefits liabilities	3	3
Income tax accruals	0	0
Due to affiliates	74	74
Operating lease liabilities	0	0
Other liabilities	0	0
Total liabilities	188	187
Redeemable noncontrolling interest	0	0
Series A convertible preferred stock	0	0
Stockholders’ equity
Total NCR stockholders’ equity	5,998	5,978
Noncontrolling interests in subsidiaries	0	0
Total stockholders’ equity	5,998	5,978
Total liabilities and stockholders’ equity	6,186	6,165
Non-Guarantor Subsidiaries
Current assets
Cash and cash equivalents	266	491	$ 390
Accounts receivable, net	1,275	1,435
Inventories	510	468
Due from affiliates	1,794	531
Other current assets	242	238
Total current assets	4,087	3,163
Property, plant and equipment, net	134	133
Goodwill	635	649
Intangibles, net	124	136
Operating lease assets	124	137
Prepaid pension cost	176	178
Deferred Income Taxes and Other Assets, Noncurrent	475	484
Investments in subsidiaries	0	0
Due from affiliates	74	74
Other assets	68	73
Total assets	5,897	5,027
Current liabilities
Short-term borrowings	295	274
Accounts payable	433	413
Payroll and benefits liabilities	98	120
Contract with Customer, Liability, Current	279	256
Due to affiliates	1,793	819
Other current liabilities	291	344
Total current liabilities	3,189	2,226
Long-term debt	3	78
Pension and indemnity plan liabilities	265	272
Postretirement and postemployment benefits liabilities	93	91
Income tax accruals	59	63
Due to affiliates	17	17
Operating lease liabilities	77	87
Other liabilities	112	112
Total liabilities	3,815	2,946
Redeemable noncontrolling interest	0	0
Series A convertible preferred stock	0	0
Stockholders’ equity
Total NCR stockholders’ equity	2,079	2,078
Noncontrolling interests in subsidiaries	3	3
Total stockholders’ equity	2,082	2,081
Total liabilities and stockholders’ equity	$ 5,897	$ 5,027