Guarantor Financial Information - Condensed Consolidated Balance Sheet (Unaudited) (Detail) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 662	$ 754	$ 446	$ 357
Trade and other receivables, net	1,282	1,171
Prepaid expenses and other current assets	328	297
Total current assets	2,272	2,222
Non-current assets
Property, plant and equipment, net	458	471
Goodwill	8,352	7,845
Other intangible assets, net	5,042	4,736
Deferred tax assets	131	127
Other non-current assets	330	329
Total assets	16,585	15,730
Current liabilities
Accounts payable and other current liabilities	1,015	1,012
Deferred revenues	328	297
Income tax liabilities	198	97
Current portion of long-term debt, capital lease obligations and short-term borrowings	67	188
Total current liabilities	1,608	1,594
Non-current liabilities
Long-term debt and capital lease obligations	8,377	7,738
Deferred tax liabilities	1,219	1,175
Other non-current liabilities	921	930
Total liabilities	12,125	11,437
Total stockholders’ equity	4,259	4,102
Noncontrolling interests	201	191
Total equity	4,460	4,293
Total liabilities and equity	16,585	15,730
Parent
Current assets
Cash and cash equivalents	1	5	(7)	1
Trade and other receivables, net	1	2
Intercompany receivables	2
Total current assets	4	7
Non-current assets
Deferred tax assets	2	2
Equity investment in subsidiaries	4,230	4,117
Intercompany loans	25	25
Total assets	4,261	4,151
Current liabilities
Intercompany payables		47
Total current liabilities		47
Non-current liabilities
Other non-current liabilities	2	2
Total liabilities	2	49
Total stockholders’ equity	4,259	4,102
Total equity	4,259	4,102
Total liabilities and equity	4,261	4,151
Issuers
Current assets
Cash and cash equivalents	19	1	18
Intercompany receivables	1,146	862
Total current assets	1,165	863
Non-current assets
Deferred tax assets	20
Other non-current assets	7	3
Equity investment in subsidiaries	1,222	1,079
Intercompany loans	8,608	11,533
Total assets	11,022	13,478
Current liabilities
Accounts payable and other current liabilities	101	52
Income tax liabilities	2	2
Current portion of long-term debt, capital lease obligations and short-term borrowings	22	145
Intercompany payables		2
Total current liabilities	125	201
Non-current liabilities
Long-term debt and capital lease obligations	8,247	7,611
Deferred tax liabilities	71	71
Intercompany loans	62	2,985
Other non-current liabilities	2	4
Total liabilities	8,507	10,872
Total stockholders’ equity	2,515	2,606
Total equity	2,515	2,606
Total liabilities and equity	11,022	13,478
Guarantor
Current assets
Cash and cash equivalents	73	219	27	7
Trade and other receivables, net	516	478
Prepaid expenses and other current assets	193	185
Intercompany receivables	322	312
Total current assets	1,104	1,194
Non-current assets
Property, plant and equipment, net	296	307
Goodwill	6,022	5,728
Other intangible assets, net	4,513	4,248
Deferred tax assets		(1)
Other non-current assets	241	245
Equity investment in subsidiaries	4,190	4,222
Intercompany loans	1,829	3,332
Total assets	18,195	19,275
Current liabilities
Accounts payable and other current liabilities	422	479
Deferred revenues	204	172
Income tax liabilities	47	36
Current portion of long-term debt, capital lease obligations and short-term borrowings	40	35
Intercompany payables	1,300	988
Total current liabilities	2,013	1,710
Non-current liabilities
Long-term debt and capital lease obligations	113	106
Deferred tax liabilities	1,063	1,027
Intercompany loans	10,173	11,708
Other non-current liabilities	603	609
Total liabilities	13,965	15,160
Total stockholders’ equity	4,230	4,117
Noncontrolling interests		(2)
Total equity	4,230	4,115
Total liabilities and equity	18,195	19,275
Non-Guarantor
Current assets
Cash and cash equivalents	569	529	$ 408	$ 349
Trade and other receivables, net	765	691
Prepaid expenses and other current assets	135	112
Intercompany receivables	123	167
Total current assets	1,592	1,499
Non-current assets
Property, plant and equipment, net	162	164
Goodwill	2,330	2,117
Other intangible assets, net	529	488
Deferred tax assets	109	126
Other non-current assets	82	81
Intercompany loans	140	150
Total assets	4,944	4,625
Current liabilities
Accounts payable and other current liabilities	492	481
Deferred revenues	124	125
Income tax liabilities	149	59
Current portion of long-term debt, capital lease obligations and short-term borrowings	5	8
Intercompany payables	293	304
Total current liabilities	1,063	977
Non-current liabilities
Long-term debt and capital lease obligations	17	21
Deferred tax liabilities	85	77
Intercompany loans	367	347
Other non-current liabilities	314	315
Total liabilities	1,846	1,737
Total stockholders’ equity	2,897	2,695
Noncontrolling interests	201	193
Total equity	3,098	2,888
Total liabilities and equity	4,944	4,625
Consolidation Eliminations
Current assets
Intercompany receivables	(1,593)	(1,341)
Total current assets	(1,593)	(1,341)
Non-current assets
Equity investment in subsidiaries	(9,642)	(9,418)
Intercompany loans	(10,602)	(15,040)
Total assets	(21,837)	(25,799)
Current liabilities
Intercompany payables	(1,593)	(1,341)
Total current liabilities	(1,593)	(1,341)
Non-current liabilities
Intercompany loans	(10,602)	(15,040)
Total liabilities	(12,195)	(16,381)
Total stockholders’ equity	(9,642)	(9,418)
Total equity	(9,642)	(9,418)
Total liabilities and equity	$ (21,837)	$ (25,799)