Stock-Based Compensation (Stock Options Outstanding, Exercisable and Activity) (Detail) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Number of Shares
Beginning Balance	3,408,699
Granted	525,299
Exercised	(1,185,030)
Forfeited/Expired	(104,580)
Ending Balance	2,644,388	3,408,699
Vested or expected to vest, at end of period	2,595,586
Exercisable, at end of period	862,065
Weighted Average Exercise Price
Beginning Balance (in dollars per share)	$ 71.34
Granted (in dollars per share)	$ 131.55
Exercised (in dollars per share)	$ 58.42
Forfeited/Expired (in dollars per share)	$ 97.15
Ending Balance (in dollars per share)	$ 88.08	$ 71.34
Vested or expected to vest, at end of period (in dollars per share)	$ 87.76
Exercisable, at end of period (in dollars per share)	$ 60.49
Weighted Average Remaining Contractual Life (in years)
Outstanding	6 years 10 months 17 days	6 years 7 months 6 days
Vested or expected to vest, at end of period	6 years 10 months 6 days
Exercisable, at end of period	4 years 3 months 22 days
Intrinsic Value (in millions)
Outstanding	$ 269	$ 218
Vested or expected to vest, at end of period	265
Exercisable, at end of period	$ 111