Guarantor Financial Information - Condensed Consolidated Statement of Cash Flows (Unaudited) (Detail) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Condensed Financial Statements Captions [Line Items]
Net cash (used in)/provided by operating activities	$ 266	$ 297
Investing activities:
Acquisition of subsidiaries and affiliates, net of cash acquired	(581)	(252)
Additions to property, plant and equipment and other assets	(31)	(55)
Additions to intangible assets	(175)	(166)
Proceeds from the sale of property, plant and equipment and other assets	28
Other investing activities	(1)	1
Net cash used in investing activities	(760)	(472)
Financing activities:
Net borrowings under revolving credit facility	101	221
Repayment of debt	(2,282)	(56)
Proceeds from issuances of debt, net of issuance costs	2,745	496
Decrease in other short-term borrowings	(5)
Cash dividends paid to stockholders	(232)	(212)
Repurchase of common stock	(84)	(304)
Activity under stock plans	16	29
Proceeds from employee stock purchase plan	3
Capital leases	(31)	(18)
Settlement of intercompany and other financing activities	(8)	(23)
Net cash provided by financing activities	223	151
Effect of exchange-rate changes on cash and cash equivalents	27	13
Net decrease in cash and cash equivalents	(244)	(11)
Cash and cash equivalents at beginning of period	754	357
Cash and cash equivalents at end of period	510	346
Parent
Condensed Financial Statements Captions [Line Items]
Net cash (used in)/provided by operating activities	(45)	(3)
Financing activities:
Cash dividends paid to stockholders	(232)	(212)
Repurchase of common stock	(84)	(304)
Activity under stock plans	21	43
Proceeds from employee stock purchase plan	3
Settlement of intercompany and other financing activities	335	396
Net cash provided by financing activities	43	(77)
Net decrease in cash and cash equivalents	(2)	(80)
Cash and cash equivalents at beginning of period	5	1
Cash and cash equivalents at end of period	3	(79)
Issuers
Condensed Financial Statements Captions [Line Items]
Net cash (used in)/provided by operating activities	110	116
Financing activities:
Repayment of debt	(2,281)	(56)
Proceeds from issuances of debt, net of issuance costs	2,745	496
Settlement of intercompany and other financing activities	(574)	(514)
Net cash provided by financing activities	(110)	(74)
Net decrease in cash and cash equivalents		42
Cash and cash equivalents at beginning of period	1
Cash and cash equivalents at end of period	1	42
Guarantor
Condensed Financial Statements Captions [Line Items]
Net cash (used in)/provided by operating activities	93	140
Investing activities:
Acquisition of subsidiaries and affiliates, net of cash acquired	(563)	(239)
Additions to property, plant and equipment and other assets	(17)	(30)
Additions to intangible assets	(146)	(145)
Proceeds from the sale of property, plant and equipment and other assets	28
Other investing activities	(1)
Net cash used in investing activities	(699)	(414)
Financing activities:
Net borrowings under revolving credit facility	101	221
Activity under stock plans	(5)	(14)
Capital leases	(30)
Settlement of intercompany and other financing activities	319	84
Net cash provided by financing activities	385	291
Effect of exchange-rate changes on cash and cash equivalents	(3)	2
Net decrease in cash and cash equivalents	(224)	19
Cash and cash equivalents at beginning of period	219	7
Cash and cash equivalents at end of period	(5)	26
Non-Guarantor
Condensed Financial Statements Captions [Line Items]
Net cash (used in)/provided by operating activities	108	44
Investing activities:
Acquisition of subsidiaries and affiliates, net of cash acquired	(18)	(13)
Additions to property, plant and equipment and other assets	(14)	(25)
Additions to intangible assets	(29)	(21)
Other investing activities		1
Net cash used in investing activities	(61)	(58)
Financing activities:
Repayment of debt	(1)
Decrease in other short-term borrowings	(5)
Capital leases	(1)
Settlement of intercompany and other financing activities	(88)	11
Net cash provided by financing activities	(95)	11
Effect of exchange-rate changes on cash and cash equivalents	30	11
Net decrease in cash and cash equivalents	(18)	8
Cash and cash equivalents at beginning of period	529	349
Cash and cash equivalents at end of period	$ 511	$ 357