Pension And Postretirement Benefits (Schedule of Estimated Future Benefit Payments) (Details) $ in Millions	Jul. 28, 2019 USD ($)
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 172
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	170
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	164
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	158
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	153
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	728
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	25
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	23
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	22
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	21
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	19
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter	$ 78