Changes in Outstanding Restricted Stock Unit Grants (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013	Dec. 28, 2012
Restricted Stock Units
Number of RSUs
Outstanding beginning balance	6,800,000
Granted	2,200,000	[1]
Distributed	(2,800,000)
Forfeited	(200,000)
Outstanding ending balance	6,000,000		6,800,000
Weighted Average Grant-Date Fair Value
Outstanding beginning balance (per unit)	$ 35
Granted (per unit)	$ 52	[1]	$ 38	$ 35
Distributed (per unit)	$ 31
Forfeited (per unit)	$ 39
Outstanding ending balance (per unit)	$ 42		$ 35
S&P RSUs
Number of RSUs
Outstanding ending balance	300,000

[1] Includes 0.3 million PSUs granted to named executive officers.