Derivative Instruments and Hedging Activities - Fair Values of Outstanding Derivative Instruments (Detail) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended	3 Months Ended		6 Months Ended													6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Foreign exchange contracts [Member]	Jun. 30, 2012 Foreign exchange contracts [Member]	Jun. 30, 2013 Foreign exchange contracts [Member]	Jun. 30, 2012 Foreign exchange contracts [Member]	Jun. 30, 2013 Derivatives designated as hedges [Member]	Dec. 31, 2012 Derivatives designated as hedges [Member]	Jun. 30, 2013 Derivatives designated as hedges [Member] Foreign exchange contracts [Member] Other current assets [Member]	Dec. 31, 2012 Derivatives designated as hedges [Member] Foreign exchange contracts [Member] Other current assets [Member]	Jun. 30, 2013 Derivatives designated as hedges [Member] Foreign exchange contracts [Member] Other Assets [Member]	Dec. 31, 2012 Derivatives designated as hedges [Member] Foreign exchange contracts [Member] Other Assets [Member]	Jun. 30, 2013 Derivatives designated as hedges [Member] Foreign exchange contracts [Member] Accounts payable and accrued liabilities [Member]	Dec. 31, 2012 Derivatives designated as hedges [Member] Foreign exchange contracts [Member] Accounts payable and accrued liabilities [Member]	Jun. 30, 2013 Derivatives designated as hedges [Member] Foreign exchange contracts [Member] Other Liabilities [Member]	Dec. 31, 2012 Derivatives designated as hedges [Member] Foreign exchange contracts [Member] Other Liabilities [Member]	Dec. 31, 2012 Derivatives designated as hedges [Member] Interest rate swaps [Member] Other Assets [Member]	Jun. 30, 2013 Derivatives not designated as hedges [Member]	Dec. 31, 2012 Derivatives not designated as hedges [Member]	Jun. 30, 2013 Derivatives not designated as hedges [Member] Foreign exchange contracts [Member] Other current assets [Member]	Dec. 31, 2012 Derivatives not designated as hedges [Member] Foreign exchange contracts [Member] Other current assets [Member]	Jun. 30, 2013 Derivatives not designated as hedges [Member] Foreign exchange contracts [Member] Other Assets [Member]	Dec. 31, 2012 Derivatives not designated as hedges [Member] Foreign exchange contracts [Member] Other Assets [Member]	Jun. 30, 2013 Derivatives not designated as hedges [Member] Foreign exchange contracts [Member] Accounts payable and accrued liabilities [Member]	Dec. 31, 2012 Derivatives not designated as hedges [Member] Foreign exchange contracts [Member] Accounts payable and accrued liabilities [Member]
Derivative Assets
Derivative Assets							$ 7	$ 50	$ 4	$ 26	$ 3	$ 22					$ 2
Derivative Assets	19	66	34	(260)	(45)	(150)												12	16	7	10	5	6
Derivative Liabilities
Derivative Liabilities							$ 161	$ 99					$ 115	$ 80	$ 46	$ 19		$ 174	$ 102					$ 13	$ 3