Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Assets, Current [Abstract]
Cash and cash equivalents	$ 1,605	$ 509
Accounts receivable, net of allowances of $55 and $44 as of September 30, 2020 and December 31, 2019, respectively	1,248	1,490
Inventories	748	784
Other current assets	396	361
Total current assets	3,997	3,144
Property, Plant and Equipment, Net	384	413
Goodwill	2,828	2,832
Intangible Assets, Net (Excluding Goodwill)	547	607
Operating Lease, Right-of-Use Asset	347	391
Assets for Plan Benefits, Defined Benefit Plan	193	178
Deferred Income Taxes and Other Assets, Noncurrent	871	821
Other Assets, Noncurrent	661	601
Assets, Total	9,828	8,987
Liabilities, Current [Abstract]
Short-term Debt	222	282
Accounts Payable, Current	676	840
Employee-related Liabilities, Current	289	308
Contract with Customer, Liability, Current	512	502
Other Liabilities, Current	579	606
Liabilities, Current, Total	2,278	2,538
Long-term debt	4,266	3,277
Pension and indemnity plan liabilities	875	858
Postretirement and postemployment benefits liabilities	119	111
Income tax accruals	94	92
Operating lease liabilities	336	369
Other liabilities	253	240
Liabilities, Total	8,221	7,485
Commitments and Contingencies (Note 9)
Series A Convertible Preferred Stock, par value $0.01, 3.0 shares authorized	408	395
Stockholders’ equity
Preferred Stock, Value, Issued	0	0
Common Stock, Value, Issued	1	1
Paid-in capital	332	312
Retained earnings	1,159	1,060
Accumulated other comprehensive loss	(297)	(269)
Total NCR stockholders’ equity	1,195	1,104
Noncontrolling interests in subsidiaries	4	3
Total stockholders’ equity	1,199	1,107
Total liabilities and stockholders’ equity	9,828	8,987
Accounts Receivable, Allowance for Credit Loss, Current	$ (55)	$ (44)
Temporary Equity, Par or Stated Value Per Share	$ 0.01	$ 0.01
Temporary Equity, Shares Authorized	3,000,000.0	3,000,000.0
Temporary Equity, Shares Issued	400,000	400,000
Temporary Equity, Shares Outstanding	400,000	400,000
Temporary Equity, Aggregate Amount of Redemption Requirement	$ 411	$ 399
Temporary Equity, Liquidation Preference	$ 411	$ 399
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	100,000,000.0	100,000,000.0
Preferred Stock, Shares Issued	0	0
Preferred Stock, Shares Outstanding	0	0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	500,000,000.0	500,000,000.0
Common Stock, Shares, Issued	128,500,000	127,700,000
Common Stock, Shares, Outstanding	128,500,000	127,700,000