Condensed Consolidating Supplemental Guarantor Information Balance Sheets (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Cash and cash equivalents	$ 462	$ 511	$ 515	$ 528
Accounts receivable, net	1,415	1,404
Inventories	676	669
Due from affiliates	0	0
Other current assets	549	504
Total current assets	3,102	3,088
Property, plant and equipment, net	351	396
Goodwill	2,754	2,760
Intangibles, net	893	926
Prepaid pension cost	535	551
Deferred income taxes	344	349
Investments in subsidiaries	0	0
Due from affiliates	0	0
Other assets	534	537
Total assets	8,513	8,607
Short-term borrowings	172	187
Accounts payable	642	712
Payroll and benefits liabilities	176	196
Deferred service revenue and customer deposits	588	494
Due to affiliates	0	0
Other current liabilities	446	481
Total current liabilities	2,024	2,070
Long-term debt	3,443	3,472
Pension and indemnity plan liabilities	676	705
Postretirement and postemployment benefits liabilities	174	170
Income tax accruals	175	181
Environmental liabilities	37	44
Due to affiliates	0	0
Other liabilities	64	67
Total liabilities	6,593	6,709
Redeemable noncontrolling interest	14	15
Total NCR stockholders’ equity	1,894	1,871
Noncontrolling interests in subsidiaries	12	12
Total stockholders’ equity	1,906	1,883
Total liabilities and stockholders’ equity	8,513	8,607
Parent Company [Member]
Cash and cash equivalents	23	40	48	75
Accounts receivable, net	78	69
Inventories	251	242
Due from affiliates	802	626
Other current assets	257	294
Total current assets	1,411	1,271
Property, plant and equipment, net	156	161
Goodwill	876	878
Intangibles, net	188	196
Prepaid pension cost	0	0
Deferred income taxes	356	363
Investments in subsidiaries	3,564	3,519
Due from affiliates	1,112	1,127
Other assets	386	375
Total assets	8,049	7,890
Short-term borrowings	94	85
Accounts payable	237	248
Payroll and benefits liabilities	78	85
Deferred service revenue and customer deposits	204	149
Due to affiliates	1,391	1,318
Other current liabilities	240	192
Total current liabilities	2,244	2,077
Long-term debt	3,427	3,454
Pension and indemnity plan liabilities	395	391
Postretirement and postemployment benefits liabilities	24	25
Income tax accruals	3	3
Environmental liabilities	37	44
Due to affiliates	17	17
Other liabilities	8	8
Total liabilities	6,155	6,019
Redeemable noncontrolling interest	0	0
Total NCR stockholders’ equity	1,894	1,871
Noncontrolling interests in subsidiaries	0	0
Total stockholders’ equity	1,894	1,871
Total liabilities and stockholders’ equity	8,049	7,890
Guarantor Subsidiary [Member]
Cash and cash equivalents	17	9	8	11
Accounts receivable, net	26	19
Inventories	8	6
Due from affiliates	1,267	1,228
Other current assets	31	28
Total current assets	1,349	1,290
Property, plant and equipment, net	1	1
Goodwill	0	0
Intangibles, net	0	0
Prepaid pension cost	0	0
Deferred income taxes	129	128
Investments in subsidiaries	1,815	1,771
Due from affiliates	21	20
Other assets	49	49
Total assets	3,364	3,259
Short-term borrowings	0	0
Accounts payable	0	0
Payroll and benefits liabilities	0	0
Deferred service revenue and customer deposits	32	21
Due to affiliates	132	124
Other current liabilities	10	10
Total current liabilities	174	155
Long-term debt	0	0
Pension and indemnity plan liabilities	0	0
Postretirement and postemployment benefits liabilities	0	0
Income tax accruals	9	10
Environmental liabilities	0	0
Due to affiliates	37	41
Other liabilities	0	0
Total liabilities	220	206
Redeemable noncontrolling interest	0	0
Total NCR stockholders’ equity	3,144	3,053
Noncontrolling interests in subsidiaries	0	0
Total stockholders’ equity	3,144	3,053
Total liabilities and stockholders’ equity	3,364	3,259
Non-Guarantor Subsidiaries [Member]
Cash and cash equivalents	422	462	459	442
Accounts receivable, net	1,311	1,316
Inventories	417	421
Due from affiliates	366	476
Other current assets	299	280
Total current assets	2,815	2,955
Property, plant and equipment, net	194	234
Goodwill	1,878	1,882
Intangibles, net	705	730
Prepaid pension cost	535	551
Deferred income taxes	45	43
Investments in subsidiaries	0	0
Due from affiliates	38	41
Other assets	99	113
Total assets	6,309	6,549
Short-term borrowings	78	102
Accounts payable	405	464
Payroll and benefits liabilities	98	111
Deferred service revenue and customer deposits	352	324
Due to affiliates	912	888
Other current liabilities	234	377
Total current liabilities	2,079	2,266
Long-term debt	16	18
Pension and indemnity plan liabilities	281	314
Postretirement and postemployment benefits liabilities	150	145
Income tax accruals	163	168
Environmental liabilities	0	0
Due to affiliates	1,117	1,130
Other liabilities	242	244
Total liabilities	4,048	4,285
Redeemable noncontrolling interest	14	15
Total NCR stockholders’ equity	2,235	2,237
Noncontrolling interests in subsidiaries	12	12
Total stockholders’ equity	2,247	2,249
Total liabilities and stockholders’ equity	6,309	6,549
Consolidation, Eliminations [Member]
Cash and cash equivalents	0	0	0	0
Accounts receivable, net	0	0
Inventories	0	0
Due from affiliates	(2,435)	(2,330)
Other current assets	(38)	(98)
Total current assets	(2,473)	(2,428)
Property, plant and equipment, net	0	0
Goodwill	0	0
Intangibles, net	0	0
Prepaid pension cost	0	0
Deferred income taxes	(186)	(185)
Investments in subsidiaries	(5,379)	(5,290)
Due from affiliates	(1,171)	(1,188)
Other assets	0	0
Total assets	(9,209)	(9,091)
Short-term borrowings	0	0
Accounts payable	0	0
Payroll and benefits liabilities	0	0
Deferred service revenue and customer deposits	0	0
Due to affiliates	(2,435)	(2,330)
Other current liabilities	(38)	(98)
Total current liabilities	(2,473)	(2,428)
Long-term debt	0	0
Pension and indemnity plan liabilities	0	0
Postretirement and postemployment benefits liabilities	0	0
Income tax accruals	0	0
Environmental liabilities	0	0
Due to affiliates	(1,171)	(1,188)
Other liabilities	(186)	(185)
Total liabilities	(3,830)	(3,801)
Redeemable noncontrolling interest	0	0
Total NCR stockholders’ equity	(5,379)	(5,290)
Noncontrolling interests in subsidiaries	0	0
Total stockholders’ equity	(5,379)	(5,290)
Total liabilities and stockholders’ equity	$ (9,209)	$ (9,091)