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Financial Instruments (Schedule Of Changes In Cash Flow Hedges In Other Comprehensive Income (Loss)) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jan. 28, 2018
Oct. 29, 2017
Jan. 29, 2017
Jan. 28, 2018
Jan. 29, 2017
Derivative Instruments, Gain (Loss) [Line Items]          
OCI before tax accumulated derivative gain (loss) beginning of period $ (27) $ (34) $ (49) $ (34) $ (64)
OCI before tax accumulated derivative gain (loss) end of period (22) (27) (27) (22) (27)
Foreign Exchange Forward Contracts [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net (5)   (2) 1 1
Foreign Exchange Forward Contracts [Member] | Cost Of Products Sold [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 2   3 0 4
Foreign Exchange Forward Contracts [Member] | Other Expenses/Income [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net 0   1 0 1
Interest Rate Contract [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net 7 $ 22 19 10 29
Interest Rate Contract [Member] | Interest Expense [Member]          
Derivative Instruments, Gain (Loss) [Line Items]          
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ 1   $ 1 $ 1 $ 2