Derivative Instruments and Hedging Activities - Fair Values of Outstanding Derivative Instruments (Detail) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Derivative Assets
Derivative Assets	$ 31	$ 40
Derivatives designated as hedges
Derivative Assets
Derivative Assets	27	35
Derivative Liabilities
Derivative Liabilities	167	227
Derivatives not designated as hedges
Derivative Liabilities
Derivative Liabilities	184	255
Foreign exchange contracts | Derivatives designated as hedges | Other current assets
Derivative Assets
Derivative Assets	4	3
Foreign exchange contracts | Derivatives designated as hedges | Other Assets
Derivative Assets
Derivative Assets	23	32
Foreign exchange contracts | Derivatives designated as hedges | Accounts payable and accrued liabilities
Derivative Liabilities
Derivative Liabilities	49	80
Foreign exchange contracts | Derivatives designated as hedges | Other Liabilities
Derivative Liabilities
Derivative Liabilities	94	105
Foreign exchange contracts | Derivatives not designated as hedges | Other current assets
Derivative Assets
Derivative Assets	4	5
Foreign exchange contracts | Derivatives not designated as hedges | Accounts payable and accrued liabilities
Derivative Liabilities
Derivative Liabilities	17	28
Cross currency swap | Derivatives designated as hedges | Other Liabilities
Derivative Liabilities
Derivative Liabilities	$ 24	$ 42