Segments - Business Segment Information (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Segment Reporting Information [Line Items]
Revenues		$ 1,616	$ 1,600	$ 4,807	$ 4,857
Depreciation and amortization		186	175	550	504
Restructuring charges		5	19	52	108
Impairment of goodwill and other long-lived assets		1,004		1,004
Share-based compensation expense		13	1	39	21
Other items	[1]	8	15	33	33
Operating income/(loss)		(740)	261	(317)	696
Business segment income/(loss)	[2]	476	471	1,361	1,362
Total assets		14,343		14,343		$ 15,179
Operating Segments | Connect
Segment Reporting Information [Line Items]
Revenues		746	763	2,255	2,349
Depreciation and amortization		57	57	167	165
Restructuring charges		8	15	34	85
Impairment of goodwill and other long-lived assets		1,004		1,004
Share-based compensation expense		4	3	12	10
Operating income/(loss)		(964)	36	(920)	51
Business segment income/(loss)	[2]	109	111	297	311
Total assets		4,422		4,422		5,416
Operating Segments | Media
Segment Reporting Information [Line Items]
Revenues		870	837	2,552	2,508
Depreciation and amortization		127	115	378	333
Restructuring charges		1	5	11	19
Share-based compensation expense		3	2	9	7
Operating income/(loss)		250	253	701	728
Business segment income/(loss)	[2]	381	375	1,099	1,087
Total assets		9,735		9,735		9,647
Corporate
Segment Reporting Information [Line Items]
Depreciation and amortization		2	3	5	6
Restructuring charges		(4)	(1)	7	4
Share-based compensation expense		6	(4)	18	4
Other items	[1]	8	15	33	33
Operating income/(loss)		(26)	(28)	(98)	(83)
Business segment income/(loss)	[2]	(14)	$ (15)	(35)	$ (36)
Total assets		$ 186		$ 186		$ 116

[1] Other items primarily consists of business optimization costs, including strategic review costs, for the three months ended September 30, 2019, and business optimization costs, including strategic review costs, and transaction related costs for the nine months ended September 30, 2019.  Other items primarily consists of business optimization costs and transaction related costs for the three and nine months ended September 30, 2018.

[2] The Company’s chief operating decision maker uses business segment income/(loss) to measure performance from period to period both at the consolidated level as well as within its operating segments.