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Derivative Instruments (Effect of Derivative Instruments Designated as Cash Flow Hedges on Other Comprehensive Income and Consolidated Statements of Operations Summary) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 28, 2018
Apr. 29, 2017
Derivatives designated as cash flow hedging instruments:        
Derivative [Line Items]        
GAINS (LOSSES) RECOGNIZED IN OCI ON DERIVATIVES (EFFECTIVE PORTION) $ (10) $ 25 $ 28 $ (23)
GAINS (LOSSES) RECLASSIFIED FROM AOCI INTO INCOME (EFFECTIVE PORTION) 28 (27) 59 (66)
Derivatives designated as cash flow hedging instruments: | Foreign currency derivatives        
Derivative [Line Items]        
GAINS (LOSSES) RECOGNIZED IN OCI ON DERIVATIVES (EFFECTIVE PORTION) (10) 25 28 (23)
Derivatives designated as cash flow hedging instruments: | Foreign currency derivatives | Operating expenses        
Derivative [Line Items]        
GAINS (LOSSES) RECLASSIFIED FROM AOCI INTO INCOME (EFFECTIVE PORTION) 21 (20) 45 (50)
Derivatives designated as cash flow hedging instruments: | Foreign currency derivatives | Cost of sales—service        
Derivative [Line Items]        
GAINS (LOSSES) RECLASSIFIED FROM AOCI INTO INCOME (EFFECTIVE PORTION) 7 (7) 14 (16)
Derivatives designated as net investment hedging instruments: | Foreign currency derivatives        
Derivative [Line Items]        
GAINS (LOSSES) RECOGNIZED IN OCI ON DERIVATIVES (EFFECTIVE PORTION) 7 (10) (10) (4)
Derivatives designated as net investment hedging instruments: | Foreign currency derivatives | Other income (loss), net        
Derivative [Line Items]        
GAINS (LOSSES) RECLASSIFIED FROM AOCI INTO INCOME (EFFECTIVE PORTION) $ 0 $ 0 $ 0 $ 0