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Related Party Transactions (Details)
$ in Millions
3 Months Ended 6 Months Ended
Feb. 29, 2016
USD ($)
Feb. 28, 2015
USD ($)
Feb. 29, 2016
USD ($)
Feb. 28, 2015
USD ($)
Jan. 05, 2015
store
Corporate Joint Venture          
Related Party Transaction [Line Items]          
Purchases from joint ventures $ 2 $ 6 $ 6 $ 13  
Former President of the Auto Parts Business Segment | Partnership Interest          
Related Party Transaction [Line Items]          
Related Party Noncontrolling Ownership Percentage By Noncontrolling Owners         25.00%
Related Party Transaction Related Party Share Of Profit (Less Than $1 Million for the Three Month Period Ended February 28, 2015)   1   1  
Related Party Noncontrolling Ownership Percentage By Parent         75.00%
Related Party Number Of Stores | store         5
Related Party Transaction Rent Expense (Less Than $1 Million For the Three Month Period Ended February 28, 2015)   $ 1   $ 1