Information about Geographic Areas and Products - Subscription Revenues (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Subscription revenues	$ 1,360	$ 1,046
Digital workflow products
Segment Reporting Information [Line Items]
Subscription revenues	1,131	868
ITOM products
Segment Reporting Information [Line Items]
Subscription revenues	162	127
Total subscription revenues
Segment Reporting Information [Line Items]
Subscription revenues	$ 1,293	$ 995