Valuation And Qualifying Accounts (Detail) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		$ 110	$ 119	$ 148
Additions Charged to costs and expenses		16	30	1
Charged (credited) to other account	[1],[2]	11	(10)	(15)
Deductions from reserves		(10)	(29)	(15)
Balance at end of period		127	110	119
Deferred tax asset valuation allowance
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of period		135	129	128
Additions Charged to costs and expenses		16	30	10
Charged (credited) to other account	[1],[2]	3	(16)	(6)
Deductions from reserves		(4)	(8)	(3)
Balance at end of period		$ 150	$ 135	$ 129

[1] Amounts include adjustments related to the divestiture of the BioSciences business.

[2] Valuation accounts of acquired or divested companies and foreign currency translation adjustments.