Derivative Instruments and Hedging Activities - Fair Values of Outstanding Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Derivative Assets
Derivative Assets	$ 40	$ 163
Derivative Liabilities
Derivative Liabilities	255	17
Derivatives designated as hedges
Derivative Assets
Derivative Assets	35	149
Derivative Liabilities
Derivative Liabilities	227	15
Derivatives not designated as hedges
Derivative Assets
Derivative Assets	5	14
Foreign exchange contracts | Derivatives designated as hedges | Other current assets
Derivative Assets
Derivative Assets	3	98
Foreign exchange contracts | Derivatives designated as hedges | Other Assets
Derivative Assets
Derivative Assets	32	24
Foreign exchange contracts | Derivatives designated as hedges | Accounts payable and accrued liabilities
Derivative Liabilities
Derivative Liabilities	80	14
Foreign exchange contracts | Derivatives designated as hedges | Other Liabilities
Derivative Liabilities
Derivative Liabilities	105	1
Foreign exchange contracts | Derivatives not designated as hedges | Other current assets
Derivative Assets
Derivative Assets	5	10
Foreign exchange contracts | Derivatives not designated as hedges | Other Assets
Derivative Assets
Derivative Assets		4
Foreign exchange contracts | Derivatives not designated as hedges | Accounts payable and accrued liabilities
Derivative Liabilities
Derivative Liabilities	28	2
Cross currency swap | Derivatives designated as hedges | Other Assets
Derivative Assets
Derivative Assets		27
Cross currency swap | Derivatives designated as hedges | Other Liabilities
Derivative Liabilities
Derivative Liabilities	$ 42