Stock-based Compensation Plans - Summary of Stock Option Activity (Detail) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule Of Stock Option Activity [Line Items]
Beginning balance, shares	42,059,000	40,027,000	37,499,000
Granted, shares	6,570,000	8,664,000	9,528,000
Exercised, shares	(5,168,000)	(4,171,000)	(5,470,000)
Forfeited, shares	(1,522,000)	(2,461,000)	(1,530,000)
Ending balance, shares	41,939,000	42,059,000	40,027,000
Beginning balance, Weighted-average exercise price	$ 67.77	$ 63.84	$ 55.33
Granted, Weighted-average exercise price	$ 72.16	$ 72.04	$ 84.29
Exercised, Weighted-average exercise price	$ 51.73	$ 39.07	$ 42.36
Forfeited, Weighted-average exercise price	$ 70.57	$ 67.50	$ 58.82
Ending balance, Weighted-average exercise price	$ 70.33	$ 67.77	$ 63.84