Financial Instruments and Fair Value Measurements - Derivative Activity (Detail) In Millions, unless otherwise specified	6 Months Ended											6 Months Ended
	Jun. 30, 2014 Euro Forward Contracts [Member] Foreign Currency Contracts [Member] USD ($) Derivative	Jun. 30, 2014 Euro Forward Contracts [Member] Foreign Currency Contracts [Member] EUR (€)	Jun. 30, 2013 Euro Forward Contracts [Member] Foreign Currency Contracts [Member] USD ($)	Jun. 30, 2013 Euro Forward Contracts [Member] Foreign Currency Contracts [Member] EUR (€)	Jun. 30, 2014 Yen Forward Contracts [Member] Foreign Currency Contracts [Member] USD ($) Derivative	Jun. 30, 2014 Yen Forward Contracts [Member] Foreign Currency Contracts [Member] JPY (¥)	Jun. 30, 2013 Yen Forward Contracts [Member] Foreign Currency Contracts [Member] USD ($)	Jun. 30, 2013 Yen Forward Contracts [Member] Foreign Currency Contracts [Member] JPY (¥)	Jun. 30, 2013 Interest Rate Swaps [Member] USD ($)	Jun. 30, 2014 Interest Rate Swaps [Member] USD ($) Derivative	Dec. 31, 2013 Interest Rate Swaps [Member] USD ($)	Jun. 30, 2014 Euro Put Options [Member] Foreign Currency Contracts [Member] USD ($) Derivative	Jun. 30, 2014 Euro Put Options [Member] Foreign Currency Contracts [Member] EUR (€) Derivative
Derivative [Line Items]
Notional amounts at January 1,	$ 800	€ 600	$ 1,304	€ 1,000	$ 250	¥ 24,136			$ 1,315	$ 71	$ 71
New contracts	1,979	1,446	800	600	578	59,083	250	24,136				46	33
Matured or expired contracts	(1,642)	(1,199)	(1,304)	(1,000)	(578)	(59,083)			(1,230)			(46)	(33)
Notional amounts at June 30,	$ 1,137	€ 847	$ 800	€ 600	$ 250	¥ 24,136	$ 250	¥ 24,136	$ 85	$ 71	$ 71
Active contracts at June 30,	10,000,000	10,000,000			3,000,000	3,000,000				1,000,000		0	0
Weighted Average Forward Rate at June 30,	1.34	1.34			96.54	96.54