Derivative Instruments and Hedging Activities - Fair Values of Outstanding Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Derivative Assets
Derivative Assets	$ 59	$ 40
Derivatives designated as hedges
Derivative Assets
Derivative Assets	37	35
Derivative Liabilities
Derivative Liabilities	313	227
Derivatives not designated as hedges
Derivative Liabilities
Derivative Liabilities	356	255
Foreign exchange contracts | Derivatives designated as hedges | Other current assets
Derivative Assets
Derivative Assets	3	3
Foreign exchange contracts | Derivatives designated as hedges | Other Assets
Derivative Assets
Derivative Assets	34	32
Foreign exchange contracts | Derivatives designated as hedges | Accounts payable and accrued liabilities
Derivative Liabilities
Derivative Liabilities	115	80
Foreign exchange contracts | Derivatives designated as hedges | Other Liabilities
Derivative Liabilities
Derivative Liabilities	138	105
Foreign exchange contracts | Derivatives not designated as hedges | Other current assets
Derivative Assets
Derivative Assets	22	5
Foreign exchange contracts | Derivatives not designated as hedges | Accounts payable and accrued liabilities
Derivative Liabilities
Derivative Liabilities	43	28
Cross currency swap | Derivatives designated as hedges | Other Liabilities
Derivative Liabilities
Derivative Liabilities	$ 60	$ 42