Segments (Tables)

9 Months Ended

Sep. 30, 2014

Segment Reporting [Abstract]

Business Segment Information

Business Segment Information

(IN MILLIONS)	Buy		Watch		Corporate			Total
Three Months Ended September 30, 2014
Revenues	$	878	$	694	—			$	1,572
Depreciation and amortization	$	55	$	83	$	1		$	139
Restructuring charges	$	4	$	1	$	1		$	6
Stock-based compensation expense	$	3	$	2	$	7		$	12
Operating income/(loss)	$	109	$	226	$	(22	)	$	313
Total assets as of September 30, 2014	$	6,882	$	8,208	$	264		$	15,354

(IN MILLIONS)
Three Months Ended September 30, 2013
Revenues	$	848	$	539	—			$	1,387
Depreciation and amortization	$	49	$	66	$	2		$	117
Restructuring charges	$	10	$	7	$	3		$	20
Stock-based compensation expense	$	3	$	3	$	5		$	11
Operating income/(loss)	$	107	$	163	$	(26	)	$	244
Total assets as of December 31, 2013	$	6,768	$	8,326	$	422		$	15,516

(IN MILLIONS)	Buy		Watch		Corporate			Total
Nine Months Ended September 30, 2014
Revenues	$	2,615	$	2,040	—			$	4,655
Depreciation and amortization	$	166	$	256	$	3		$	425
Restructuring charges	$	26	$	11	$	6		$	43
Stock-based compensation expense	$	12	$	8	$	15		$	35
Operating income/(loss)	$	252	$	602	$	(70	)	$	784

(IN MILLIONS)
Nine Months Ended September 30, 2013
Revenues	$	2,503	$	1,589	—			$	4,092
Depreciation and amortization	$	149	$	209	$	6		$	364
Restructuring charges	$	27	$	19	$	17		$	63
Stock-based compensation expense	$	10	$	7	$	15		$	32
Operating income/(loss)	$	268	$	441	$	(83	)	$	626