Acquisitions - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended
	Jun. 30, 2012	Oct. 28, 2012 Location	Jun. 29, 2012	Jun. 29, 2012 Customer Relationships	Jun. 29, 2012 Peachtree Business Products LLC	May 02, 2011 Rexford Albany Municipal Supply Company Incorporated Location
Business Acquisition [Line Items]
Acquisition of assets, price					$ 196	$ 21
Business acquisition, goodwill recorded			129
Business acquisition, definite-lived intangible assets recorded			53	50
Business acquisition, property & equipment recorded			12
Business acquisition, net working capital recorded			8
Business acquisition, deferred tax liabilities recorded		6	6
Business acquisition, goodwill expected to be deductible for tax purposes			$ 47
Definite-lived intangible asset, average useful life	11 years
Number of location		630				4