Guarantor Financial Information - Condensed Consolidated Balance Sheet (Unaudited) (Detail) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 451	$ 754	$ 432	$ 357
Trade and other receivables, net	1,287	1,171
Prepaid expenses and other current assets	363	297
Total current assets	2,101	2,222
Non-current assets
Property, plant and equipment, net	464	471
Goodwill	8,212	7,845
Other intangible assets, net	5,086	4,736
Deferred tax assets	133	127
Other non-current assets	336	329
Total assets	16,332	15,730
Current liabilities
Accounts payable and other current liabilities	933	1,012
Deferred revenues	364	297
Income tax liabilities	102	97
Current portion of long-term debt, capital lease obligations and short-term borrowings	236	188
Total current liabilities	1,635	1,594
Non-current liabilities
Long-term debt and capital lease obligations	8,180	7,738
Deferred tax liabilities	1,272	1,175
Other non-current liabilities	928	930
Total liabilities	12,015	11,437
Total stockholders’ equity	4,123	4,102
Noncontrolling interests	194	191
Total equity	4,317	4,293
Total liabilities and equity	16,332	15,730
Parent
Current assets
Cash and cash equivalents	9	5	6	1
Trade and other receivables, net		2
Intercompany receivables	1
Total current assets	10	7
Non-current assets
Deferred tax assets	2	2
Equity investment in subsidiaries	4,088	4,117
Intercompany loans	25	25
Total assets	4,125	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	4,123	4,102
Total equity	4,123	4,102
Total liabilities and equity	4,125	4,151
Issuers
Current assets
Cash and cash equivalents	18	1	18
Intercompany receivables	1,001	862
Total current assets	1,019	863
Non-current assets
Deferred tax assets	3
Other non-current assets	4	3
Intercompany loans	11,533	11,533
Total assets	12,559	12,399
Current liabilities
Accounts payable and other current liabilities	102	52
Income tax liabilities	2	2
Current portion of long-term debt, capital lease obligations and short-term borrowings	198	145
Intercompany payables	2	2
Total current liabilities	304	201
Non-current liabilities
Long-term debt and capital lease obligations	8,055	7,611
Deferred tax liabilities	71	71
Intercompany loans	2,985	2,985
Other non-current liabilities	2	4
Total liabilities	11,417	10,872
Total stockholders’ equity	1,142	1,527
Total equity	1,142	1,527
Total liabilities and equity	12,559	12,399
Guarantor
Current assets
Cash and cash equivalents	(41)	219	88	7
Trade and other receivables, net	567	478
Prepaid expenses and other current assets	238	185
Intercompany receivables	297	312
Total current assets	1,061	1,194
Non-current assets
Property, plant and equipment, net	302	307
Goodwill	6,027	5,728
Other intangible assets, net	4,572	4,248
Deferred tax assets		(1)
Other non-current assets	250	245
Equity investment in subsidiaries	3,901	4,222
Intercompany loans	3,339	3,332
Total assets	19,452	19,275
Current liabilities
Accounts payable and other current liabilities	395	479
Deferred revenues	221	172
Income tax liabilities	20	36
Current portion of long-term debt, capital lease obligations and short-term borrowings	34	35
Intercompany payables	1,159	988
Total current liabilities	1,829	1,710
Non-current liabilities
Long-term debt and capital lease obligations	105	106
Deferred tax liabilities	1,109	1,027
Intercompany loans	11,712	11,708
Other non-current liabilities	609	609
Total liabilities	15,364	15,160
Total stockholders’ equity	4,088	4,117
Noncontrolling interests		(2)
Total equity	4,088	4,115
Total liabilities and equity	19,452	19,275
Non-Guarantor
Current assets
Cash and cash equivalents	465	529	$ 320	$ 349
Trade and other receivables, net	720	691
Prepaid expenses and other current assets	125	112
Intercompany receivables	102	167
Total current assets	1,412	1,499
Non-current assets
Property, plant and equipment, net	162	164
Goodwill	2,185	2,117
Other intangible assets, net	514	488
Deferred tax assets	128	126
Other non-current assets	82	81
Intercompany loans	153	150
Total assets	4,636	4,625
Current liabilities
Accounts payable and other current liabilities	436	481
Deferred revenues	143	125
Income tax liabilities	80	59
Current portion of long-term debt, capital lease obligations and short-term borrowings	4	8
Intercompany payables	240	304
Total current liabilities	903	977
Non-current liabilities
Long-term debt and capital lease obligations	20	21
Deferred tax liabilities	92	77
Intercompany loans	353	347
Other non-current liabilities	315	315
Total liabilities	1,683	1,737
Total stockholders’ equity	2,759	2,695
Noncontrolling interests	194	193
Total equity	2,953	2,888
Total liabilities and equity	4,636	4,625
Consolidation Eliminations
Current assets
Intercompany receivables	(1,401)	(1,341)
Total current assets	(1,401)	(1,341)
Non-current assets
Equity investment in subsidiaries	(7,989)	(8,339)
Intercompany loans	(15,050)	(15,040)
Total assets	(24,440)	(24,720)
Current liabilities
Intercompany payables	(1,401)	(1,341)
Total current liabilities	(1,401)	(1,341)
Non-current liabilities
Intercompany loans	(15,050)	(15,040)
Total liabilities	(16,451)	(16,381)
Total stockholders’ equity	(7,989)	(8,339)
Total equity	(7,989)	(8,339)
Total liabilities and equity	$ (24,440)	$ (24,720)