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Share-based Compensation (Stock option activity) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Jun. 30, 2017
Jul. 01, 2016
Jul. 03, 2015
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 15 $ 18 $ 10
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition 2 years 6 months    
Number of shares, outstanding at the beginning of the period 5.4    
Number of shares, granted 2.3    
Number of shares, exercised (1.6)    
Number of shares, forfeitures (0.3)    
Number of shares, expirations 0.1    
Number of shares, outstanding at the end of the period 5.7 5.4  
Number of shares, vested and expected to vest 5.5    
Number of shares, exercisable 2.1    
Weighted-average exercise price, outstanding at the beginning of the period (in dollars per share) $ 34.91    
Weighted-average exercise price, granted (in dollars per share) 36.78    
Weighted average exercise price option issued (in dollars per share) 19.87    
Weighted-average exercise price, forfeitures (in dollars per share) 41.07    
Weighted-average exercise price, expirations (in dollars per share) 47.66    
Weighted-average exercise price, outstanding at the end of the period (in dollars per share) 39.24 $ 34.91  
Weighted-average exercise price, vested and expected to vest (in dollars per share) 39.28    
Weighted-average exercise price, exercisable (in dollars per share) $ 39.82    
Weighted-average remaining contractual term, outstanding at the beginning of the period (in years) 5 years 4 years 6 months 26 days  
Weighted-average remaining contractual term, outstanding at the end of the period (in years) 5 years 4 years 6 months 26 days  
Weighted-average remaining contractual term, vested and expected to vest (in years) 5 years    
Weighted-average remaining contractual term, exercisable (in years) 3 years 7 months 6 days    
Aggregate intrinsic value, outstanding at the beginning of the period $ 14    
Aggregate intrinsic value, outstanding at the end of the period 22 $ 14  
Aggregate intrinsic value, vested and expected to vest 21    
Aggregate intrinsic value, exercisable $ 12    
Nonvested Shares [Member] | Stock Compensation Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition 2 years 7 months 6 days