Goodwill and Intangible Assets - Change in Company's Goodwill and Intangible Assets (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified	Nov. 30, 2013	Feb. 23, 2013
Goodwill [Line Items]
Finite-Lived intangible Assets, Accumulated Amortization	$ 77	$ 67
Customer Lists, Pharmacy Scripts, Favorable Operating Leases and Other [Member]
Goodwill [Line Items]
Finite-Lived intangible Assets, Accumulated Amortization	75	2
Non-Compete Agreements [Member]
Goodwill [Line Items]
Finite-Lived intangible Assets, Accumulated Amortization	$ 65	$ 2