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	9 Months Ended	12 Months Ended
	Sep. 30, 2013	Dec. 31, 2012	Sep. 30, 2013 Foreign exchange contracts	Sep. 30, 2012 Foreign exchange contracts	Sep. 30, 2013 Foreign exchange contracts	Sep. 30, 2012 Foreign exchange contracts	Sep. 30, 2013 Derivatives designated as hedges	Dec. 31, 2012 Derivatives designated as hedges	Sep. 30, 2013 Derivatives designated as hedges Foreign exchange contracts Other current assets	Dec. 31, 2012 Derivatives designated as hedges Foreign exchange contracts Other current assets	Sep. 30, 2013 Derivatives designated as hedges Foreign exchange contracts Other Assets	Dec. 31, 2012 Derivatives designated as hedges Foreign exchange contracts Other Assets	Sep. 30, 2013 Derivatives designated as hedges Foreign exchange contracts Accounts payable and accrued liabilities	Dec. 31, 2012 Derivatives designated as hedges Foreign exchange contracts Accounts payable and accrued liabilities	Sep. 30, 2013 Derivatives designated as hedges Foreign exchange contracts Other Liabilities	Dec. 31, 2012 Derivatives designated as hedges Foreign exchange contracts Other Liabilities	Dec. 31, 2012 Derivatives designated as hedges Interest rate swaps Other Assets	Sep. 30, 2013 Derivatives not designated as hedges	Dec. 31, 2012 Derivatives not designated as hedges	Sep. 30, 2013 Derivatives not designated as hedges Foreign exchange contracts Other current assets	Dec. 31, 2012 Derivatives not designated as hedges Foreign exchange contracts Other current assets	Sep. 30, 2013 Derivatives not designated as hedges Foreign exchange contracts Other Assets	Dec. 31, 2012 Derivatives not designated as hedges Foreign exchange contracts Other Assets	Sep. 30, 2013 Derivatives not designated as hedges Foreign exchange contracts Accounts payable and accrued liabilities	Dec. 31, 2012 Derivatives not designated as hedges Foreign exchange contracts Accounts payable and accrued liabilities
Derivative Assets
Derivative Assets							$ 69	$ 50	$ 66	$ 26	$ 3	$ 22					$ 2
Derivative Assets	86	66	30	92	(15)	(58)												17	16	12	10	5	6
Derivative Liabilities
Derivative Liabilities							$ 15	$ 99					$ 12	$ 80	$ 3	$ 19		$ 21	$ 102					$ 6	$ 3