Stock-Based Awards - Additional Information (Detail) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended		3 Months Ended		6 Months Ended						4 Months Ended
	May 31, 2014	May 31, 2013	Sep. 06, 2014	Sep. 07, 2013	Sep. 06, 2014	Sep. 07, 2013	Sep. 07, 2013 Stock Options and Restricted Stock Awards [Member]	Sep. 07, 2013 Long Term Incentive Program [Member]	Sep. 07, 2013 Restricted Stock [Member]	Sep. 07, 2013 Stock Options [Member]	Jun. 14, 2014 Restricted Stock Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Pre-tax stock-based compensation expense related to stock-based awards			$ 3	$ 6	$ 13	$ 15
Accelerated Stock Compensation resulted by deemed change-in-control							$ 9	$ 5	$ 3	$ 1
Award units grant to certain employees	5,000,000	9,000,000									2,000,000
Fair value of the options at grand date	$ 3.28	$ 2.78
Term for payout of awards over achievement of financial goals					3 years						3 years
Share granted to certain employees at a fair value											$ 7.50