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Equity - Capped Calls (Details) - USD ($)
$ / shares in Units, shares in Millions
12 Months Ended
Aug. 30, 2018
Aug. 31, 2017
Sep. 01, 2016
Option Indexed to Issuer's Equity [Line Items]      
Settlement of capped calls, value of shares received $ 0 $ (125,000,000) $ 0
Treasury Stock      
Option Indexed to Issuer's Equity [Line Items]      
Settlement of capped calls, value of shares received $ 429,000,000 67,000,000 $ 23,000,000
Call Option | Purchased options      
Option Indexed to Issuer's Equity [Line Items]      
Proceeds received upon settlement of capped calls   $ 125,000,000  
Treasury Shares from Capped Call Settlement 9 4 2
Call Option | Purchased options | Treasury Stock      
Option Indexed to Issuer's Equity [Line Items]      
Settlement of capped calls, value of shares received $ 429,000,000 $ 67,000,000 $ 23,000,000
Call Option | Purchased options | 2033F Notes      
Option Indexed to Issuer's Equity [Line Items]      
Capped calls, underlying common shares (in shares) 27    
Capped calls, initial strike price (in dollars per share) $ 10.93    
Capped calls, cap price (in dollars per share) $ 14.51    
Call Option | Purchased options | 2033F Notes | Minimum      
Option Indexed to Issuer's Equity [Line Items]      
Potential value of capped calls at expiration $ 0    
Call Option | Purchased options | 2033F Notes | Maximum      
Option Indexed to Issuer's Equity [Line Items]      
Potential value of capped calls at expiration $ 98,000,000