Condensed Consolidating Balance Sheet (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Assets
Cash and cash equivalents	$ 294	$ 400	$ 358	$ 337
Trade accounts receivable, net	798	751
Deferred income taxes	42	55
Prepaid expenses and other current assets	352	366
Total current assets	1,486	1,572
Intangible assets, net	2,003	2,142
Goodwill	5,209	5,216	4,705
Other long-term assets	639	583
Total assets	9,337	9,513	8,497
Liabilities and Shareholders' Equity
Accounts payable and accrued expenses	905	756
Current maturities of long-term debt	92	92
Deferred revenue	489	484
Total current liabilities	1,486	1,332
Long-term debt	3,711	3,756
Other long-term liabilities	845	840
Total liabilities	6,042	5,928
Total shareholders' equity	3,295	3,585
Total liabilities and shareholders' equity	9,337	9,513
Parent Company
Assets
Cash and cash equivalents	21	139	85	73
Deferred income taxes	40	54
Prepaid expenses and other current assets	8	27
Total current assets	69	220
Investments in consolidated affiliates	10,987	10,122
Intangible assets, net	23	22
Other long-term assets	36	33
Total assets	11,115	10,397
Liabilities and Shareholders' Equity
Accounts payable and accrued expenses	119	87
Current maturities of long-term debt	90	90
Total current liabilities	209	177
Long-term debt	3,707	3,754
Due to consolidated affiliates	3,137	2,108
Other long-term liabilities	767	773
Total liabilities	7,820	6,812
Total shareholders' equity	3,295	3,585
Total liabilities and shareholders' equity	11,115	10,397
Guarantor Subsidiaries
Assets
Cash and cash equivalents	80	76	66	71
Trade accounts receivable, net	510	465
Prepaid expenses and other current assets	209	195
Total current assets	799	736
Due from consolidated affiliates	2,467	1,683
Intangible assets, net	1,734	1,866
Goodwill	4,154	4,150
Other long-term assets	496	448
Total assets	9,650	8,883
Liabilities and Shareholders' Equity
Accounts payable and accrued expenses	586	463
Current maturities of long-term debt	2	2
Deferred revenue	285	292
Total current liabilities	873	757
Long-term debt	4	2
Other long-term liabilities	31	25
Total liabilities	908	784
Total shareholders' equity	8,742	8,099
Total liabilities and shareholders' equity	9,650	8,883
Non-Guarantor Subsidiaries
Assets
Cash and cash equivalents	193	185	207	193
Trade accounts receivable, net	288	286
Deferred income taxes	2	1
Prepaid expenses and other current assets	135	144
Total current assets	618	616
Due from consolidated affiliates	670	425
Intangible assets, net	246	254
Goodwill	1,055	1,066
Other long-term assets	107	102
Total assets	2,696	2,463
Liabilities and Shareholders' Equity
Accounts payable and accrued expenses	200	206
Deferred revenue	204	192
Total current liabilities	404	398
Other long-term liabilities	47	42
Total liabilities	451	440
Total shareholders' equity	2,245	2,023
Total liabilities and shareholders' equity	2,696	2,463
Eliminations
Assets
Due from consolidated affiliates	(3,137)	(2,108)
Investments in consolidated affiliates	(10,987)	(10,122)
Total assets	(14,124)	(12,230)
Liabilities and Shareholders' Equity
Due to consolidated affiliates	(3,137)	(2,108)
Total liabilities	(3,137)	(2,108)
Total shareholders' equity	(10,987)	(10,122)
Total liabilities and shareholders' equity	$ (14,124)	$ (12,230)