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Derivative Instruments (Derivatives Recorded at Fair Value) (Details) - USD ($)
$ in Millions
Apr. 28, 2018
Jul. 29, 2017
Derivative [Line Items]    
DERIVATIVE ASSETS $ 13 $ 149
DERIVATIVE LIABILITIES 92 4
Derivatives designated as hedging instruments:    
Derivative [Line Items]    
DERIVATIVE ASSETS 12 148
DERIVATIVE LIABILITIES 91 1
Derivatives designated as hedging instruments: | Foreign currency derivatives | Other current assets    
Derivative [Line Items]    
DERIVATIVE ASSETS 12 46
Derivatives designated as hedging instruments: | Foreign currency derivatives | Other current liabilities    
Derivative [Line Items]    
DERIVATIVE LIABILITIES 1 1
Derivatives designated as hedging instruments: | Equity derivatives | Other current assets    
Derivative [Line Items]    
DERIVATIVE ASSETS 0 0
Derivatives designated as hedging instruments: | Equity derivatives | Other current liabilities    
Derivative [Line Items]    
DERIVATIVE LIABILITIES 24 0
Derivatives designated as hedging instruments: | Interest rate derivatives | Other current assets    
Derivative [Line Items]    
DERIVATIVE ASSETS 0 0
Derivatives designated as hedging instruments: | Interest rate derivatives | Other current liabilities    
Derivative [Line Items]    
DERIVATIVE LIABILITIES 12 0
Derivatives designated as hedging instruments: | Interest rate derivatives | Other assets    
Derivative [Line Items]    
DERIVATIVE ASSETS 0 102
Derivatives designated as hedging instruments: | Interest rate derivatives | Other long-term liabilities    
Derivative [Line Items]    
DERIVATIVE LIABILITIES 54 0
Derivatives not designated as hedging instruments:    
Derivative [Line Items]    
DERIVATIVE ASSETS 1 1
DERIVATIVE LIABILITIES 1 3
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other current assets    
Derivative [Line Items]    
DERIVATIVE ASSETS 1 1
Derivatives not designated as hedging instruments: | Foreign currency derivatives | Other current liabilities    
Derivative [Line Items]    
DERIVATIVE LIABILITIES 1 3
Derivatives not designated as hedging instruments: | Total return swaps—deferred compensation | Other current assets    
Derivative [Line Items]    
DERIVATIVE ASSETS 0 0
Derivatives not designated as hedging instruments: | Total return swaps—deferred compensation | Other current liabilities    
Derivative [Line Items]    
DERIVATIVE LIABILITIES $ 0 $ 0