Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets, Current [Abstract]
Cash and cash equivalents	$ 319	$ 338
Accounts receivable, net of allowances of $39 and $51 as of March 31, 2021 and December 31, 2020, respectively	1,212	1,117
Inventories	634	601
Other current assets	447	422
Total current assets	2,612	2,478
Property, Plant and Equipment, Net	364	373
Goodwill	2,924	2,837
Intangible Assets, Net (Excluding Goodwill)	565	532
Operating Lease, Right-of-Use Asset	396	344
Assets for Plan Benefits, Defined Benefit Plan	202	199
Deferred Income Taxes and Other Assets, Noncurrent	946	965
Other Assets, Noncurrent	693	686
Assets, Total	8,702	8,414
Liabilities, Current [Abstract]
Short-term Debt	52	8
Accounts Payable, Current	707	632
Employee-related Liabilities, Current	227	268
Contract with Customer, Liability, Current	594	507
Other Liabilities, Current	638	673
Liabilities, Current, Total	2,218	2,088
Long-term debt	3,349	3,270
Pension and indemnity plan liabilities	839	851
Postretirement and postemployment benefits liabilities	117	120
Income tax accruals	101	102
Operating lease liabilities	377	325
Other liabilities	328	334
Liabilities, Total	7,329	7,090
Commitments and Contingencies (Note 9)
Series A Convertible Preferred Stock, par value $0.01, 3.0 shares authorized	273	273
Stockholders’ equity
Preferred Stock, Value, Issued	0	0
Common Stock, Value, Issued	1	1
Paid-in capital	398	368
Retained earnings	976	950
Accumulated other comprehensive loss	(279)	(271)
Total NCR stockholders’ equity	1,096	1,048
Noncontrolling interests in subsidiaries	4	3
Total stockholders’ equity	1,100	1,051
Total liabilities and stockholders’ equity	$ 8,702	$ 8,414