Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Total revenue	$ 1,544	$ 1,503
Selling, general and administrative expenses	238	255
Research and development expenses	66	65
Total operating expenses	1,434	1,426
Income (loss) from operations	110	77
Interest expense	(45)	(50)
Other expense, net	(17)	(2)
Income (loss) from continuing operations before income taxes	48	25
Income tax expense (benefit)	17	1
Income (loss) from continuing operations	31	24
Loss from discontinued operations, net of tax	0	0
Net income (loss)	31	24
Net income (loss) attributable to noncontrolling interests	1	1
Net income (loss) attributable to NCR	30	23
Amounts attributable to NCR common stockholders:
Income (loss) from continuing operations	30	23
Dividends on convertible preferred stock	(4)	(6)
Income (loss) from continuing operations attributable to NCR common stockholders	26	17
Loss from discontinued operations, net of tax	0	0
Net income (loss) attributable to NCR common stockholders	$ 26	$ 17
Income (loss) per common share from continuing operations
Basic (in dollars per share)	$ 0.20	$ 0.13
Diluted (in dollars per share)	0.19	0.13
Net income (loss) per common share
Basic (in dollars per share)	0.20	0.13
Diluted (in dollars per share)	$ 0.19	$ 0.13
Weighted average common shares outstanding
Basic (in shares)	130.0	128.0
Diluted (in shares)	134.7	130.5
Product
Total revenue	$ 482	$ 474
Cost of revenue	408	391
Services
Total revenue	1,062	1,029
Cost of revenue	$ 722	$ 715