Revenue Recognition - Summary of Revenue Disaggregated by Segment by Major Product Offerings and Timing of Revenue Recognition (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	$ 1,559	$ 1,563
Operating Segments | Products Transferred at a Point in Time
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	137	131
Operating Segments | Products and Services Transferred Over Time
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	1,422	1,432
Connect | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	717	737
Connect | Operating Segments | Measurement
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	510	539
Connect | Operating Segments | Predict/Activate
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	207	198
Media | Operating Segments
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	842	826
Media | Operating Segments | Audience Measurement
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	615	605
Media | Operating Segments | Planning/Optimization
Segment Reporting Revenue Reconciling Item [Line Items]
Revenues	$ 227	$ 221