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Debt (Carrying Value and Estimated Fair Value of Company's Long-term Debt) (Details) - USD ($)
$ in Millions
8 Months Ended
May 18, 2017
May 07, 2017
Aug. 28, 2016
Dec. 07, 2012
Debt Instrument [Line Items]        
Total long-term debt, carrying value   $ 3,979 $ 5,161  
Less current portion, carrying value   1,158 1,100  
Long-term debt, excluding current portion   2,821 4,061  
Total long-term debt, fair value   4,013 5,274  
Less current portion, fair value   1,159 1,130  
Long-term debt, excluding current portion, fair value   $ 2,854 4,144  
5.5% Senior Notes Due March 2017        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage   5.50%    
Debt instrument, maturity date   Mar. 15, 2017    
Total long-term debt, carrying value   $ 0 1,100  
Senior Notes One Point One Two Five Percent Due December Fifteen Twenty Seventeen [Member]        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage   1.125%    
Debt instrument, maturity date   Dec. 15, 2017    
Total long-term debt, carrying value   $ 1,099 1,099  
1.7% Senior Notes Due December 2019        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage   1.70%    
Debt instrument, maturity date   Dec. 15, 2019    
Total long-term debt, carrying value   $ 1,197 1,196  
1.75% Senior Notes Due February 2020        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage   1.75%    
Debt instrument, maturity date   Feb. 15, 2020    
Total long-term debt, carrying value   $ 498 498  
2.25% Senior Notes Due February 2022        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage   2.25%    
Debt instrument, maturity date   Feb. 15, 2022    
Total long-term debt, carrying value   $ 497 497  
Other Long-term Debt        
Debt Instrument [Line Items]        
Total long-term debt, carrying value   688 771  
Fair Value, Inputs, Level 2 | 5.5% Senior Notes Due March 2017        
Debt Instrument [Line Items]        
Total long-term debt, fair value   0 1,129  
Fair Value, Inputs, Level 2 | Senior Notes One Point One Two Five Percent Due December Fifteen Twenty Seventeen [Member]        
Debt Instrument [Line Items]        
Total long-term debt, fair value   1,099 1,103  
Fair Value, Inputs, Level 2 | 1.7% Senior Notes Due December 2019        
Debt Instrument [Line Items]        
Total long-term debt, fair value   1,200 1,219  
Fair Value, Inputs, Level 2 | 1.75% Senior Notes Due February 2020        
Debt Instrument [Line Items]        
Total long-term debt, fair value   500 508  
Fair Value, Inputs, Level 2 | 2.25% Senior Notes Due February 2022        
Debt Instrument [Line Items]        
Total long-term debt, fair value   501 512  
Fair Value, Inputs, Level 3 | Other Long-term Debt        
Debt Instrument [Line Items]        
Total long-term debt, fair value   $ 713 $ 803  
Senior Notes One Point One Two Five Percent Due December Fifteen Twenty Seventeen [Member]        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage       1.125%
Senior Notes One Point One Two Five Percent Due December Fifteen Twenty Seventeen [Member] | Subsequent Event        
Debt Instrument [Line Items]        
Debt instrument, maturity date Dec. 15, 2017