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Financial Instruments (Schedule of Cash Flow Hedges in Statements of Earnings) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 30, 2023
May 01, 2022
Apr. 30, 2023
May 01, 2022
Derivative Instruments, Gain (Loss) [Line Items]        
Cost of products sold $ 1,561 $ 1,465 $ 5,028 $ 4,519
Interest expense 47 51 139 144
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Cost of products sold (2) (4) (9) (5)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] | Interest Rate Contract [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]        
Derivative Instruments, Gain (Loss) [Line Items]        
Interest expense $ 0 $ 0 $ 1 $ 1