EBITDA to Income from Continuing Operations Reconciliation (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Total segment EBITDA	$ 631	$ 572
Reconciling items
Depreciation and amortization	(189)	(187)
Stock compensation	(23)	(29)
Net interest expense	(28)	(30)
Business optimization items	(5)
Certain foreign currency fluctuations and hedging activities	22	108
Net realized gains on Retained Shares transactions	3,239
Net loss on debt extinguishment	(101)
Other Corporate items	(217)	(286)
Income from continuing operations before income taxes	$ 3,329	$ 148