Derivative Instruments and Hedging Activities - Fair Values of Outstanding Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended	12 Months Ended	3 Months Ended		9 Months Ended														9 Months Ended	12 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2014 Foreign exchange contracts	Sep. 30, 2013 Foreign exchange contracts	Sep. 30, 2014 Foreign exchange contracts	Sep. 30, 2013 Foreign exchange contracts	Sep. 30, 2014 Derivatives designated as hedges	Dec. 31, 2013 Derivatives designated as hedges	Sep. 30, 2014 Derivatives designated as hedges Foreign exchange contracts Other current assets	Dec. 31, 2013 Derivatives designated as hedges Foreign exchange contracts Other current assets	Sep. 30, 2014 Derivatives designated as hedges Foreign exchange contracts Other Assets	Dec. 31, 2013 Derivatives designated as hedges Foreign exchange contracts Other Assets	Sep. 30, 2014 Derivatives designated as hedges Foreign exchange contracts Accounts payable and accrued liabilities	Dec. 31, 2013 Derivatives designated as hedges Foreign exchange contracts Accounts payable and accrued liabilities	Sep. 30, 2014 Derivatives designated as hedges Foreign exchange contracts Other Liabilities	Dec. 31, 2013 Derivatives designated as hedges Foreign exchange contracts Other Liabilities	Dec. 31, 2013 Derivatives designated as hedges Interest rate swap Other Assets	Sep. 30, 2014 Derivatives designated as hedges Interest rate swap Other Liabilities	Sep. 30, 2014 Derivatives not designated as hedges	Dec. 31, 2013 Derivatives not designated as hedges	Sep. 30, 2014 Derivatives not designated as hedges Foreign exchange contracts Other current assets	Dec. 31, 2013 Derivatives not designated as hedges Foreign exchange contracts Other current assets	Dec. 31, 2013 Derivatives not designated as hedges Foreign exchange contracts Other Assets	Sep. 30, 2014 Derivatives not designated as hedges Foreign exchange contracts Accounts payable and accrued liabilities	Dec. 31, 2013 Derivatives not designated as hedges Foreign exchange contracts Accounts payable and accrued liabilities
Derivative Assets
Derivative Assets							$ 5	$ 149	$ 3	$ 98	$ 2	$ 24					$ 27
Derivative Assets	15	163	(53)	30	(59)	(15)													10	14	10	10	4
Derivative Liabilities
Derivative Liabilities							$ 140	$ 15					$ 42	$ 14	$ 83	$ 1		$ 15	$ 150	$ 17				$ 10	$ 2