Revenue Recognition - Summary of Revenue Disaggregated by Segment by Major Product Offerings and Timing of Revenue Recognition (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019		Dec. 31, 2018		Dec. 31, 2017
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	$ 1,691	$ 1,616	$ 1,628	$ 1,563	$ 1,658	$ 1,600	$ 1,647	$ 1,610	$ 6,498	[1]	$ 6,515	[1]	$ 6,572	[1]
Operating Segments | Products Transferred at a Point in Time
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									576		576		495
Operating Segments | Products and Services Transferred Over Time
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									5,922		5,939		6,077
Connect | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									3,057		3,138		3,278
Connect | Operating Segments | Measure
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									2,161		2,211		2,233
Connect | Operating Segments | Predict/Activate
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									896		927		1,045
Media | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									3,441		3,377		3,294
Media | Operating Segments | Audience Measurement
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									2,471		2,411		2,321
Media | Operating Segments | Plan/Optimize
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues									$ 970		$ 966		$ 973

[1] Revenues are attributed to geographic areas based on the location of customers.