Changes in Outstanding Stock Option Program Awards (Detail) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 28, 2012
Number of Stock Options (in millions)
Granted	75,861	96,960	255,761
Outstanding ending balance	700,000
Weighted Average Exercise Price (per Option)
Granted (per unit)	$ 17	$ 13	$ 12
Outstanding ending balance (per unit)	$ 36
Employee Stock Option
Number of Stock Options (in millions)
Outstanding beginning balance	4,600,000
Granted	100,000
Exercised	(4,000,000)
Forfeited	0
Outstanding ending balance	700,000
Weighted Average Exercise Price (per Option)
Outstanding beginning balance (per unit)	$ 22
Granted (per unit)	$ 53
Exercised (per unit)	$ 20
Forfeited (per unit)	$ 0
Outstanding ending balance (per unit)	$ 36
Vesting period	4 years