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Financial Instruments (Schedule of Cash Flow Hedges in Statements of Earnings) (Details) - USD ($)
$ in Millions
3 Months Ended
Oct. 27, 2019
Oct. 28, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
Earnings (loss) from discontinued operations $ (3) $ 14
Interest expense 80 91
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Expense [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net 0 0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Discontinued Operations, Held-for-sale or Disposed of by Sale [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Gain (Loss) from Components Excluded from Assessment of Fair Value Hedge Effectiveness, Net 0  
Reclassification out of Accumulated Other Comprehensive Income [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Foreign Exchange Forward Contracts [Member]    
Derivative Instruments, Gain (Loss) [Line Items]    
Earnings (loss) from discontinued operations (1) 0
Interest expense $ 1 $ 1