Revenue Recognition - Summary of Revenue Disaggregated by Major Product Offerings and Timing of Revenue Recognition (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Disaggregation Of Revenue [Line Items]
Revenues	$ 877	$ 863
Operating Segments | Products Transferred at a Point in Time
Disaggregation Of Revenue [Line Items]
Revenues	93	83
Operating Segments | Products and Services Transferred Over Time
Disaggregation Of Revenue [Line Items]
Revenues	784	780
Media | Operating Segments
Disaggregation Of Revenue [Line Items]
Revenues	877	863
Media | Operating Segments | Measurement
Disaggregation Of Revenue [Line Items]
Revenues	645	632
Media | Operating Segments | Impact/Content
Disaggregation Of Revenue [Line Items]
Revenues	$ 232	$ 231