Pension And Postretirement Benefits (Schedule Of Components of Benefit Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Jul. 28, 2024	Jul. 30, 2023	Jul. 31, 2022
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Service Cost	$ 13	$ 13	$ 16
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other expenses / (income)	Other expenses / (income)	Other expenses / (income)
Defined Benefit Plan, Interest Cost	$ 65	$ 73	$ 49
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other expenses / (income)	Other expenses / (income)	Other expenses / (income)
Expected return on plan assets	$ (80)	$ (100)	$ (118)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other expenses / (income)	Other expenses / (income)	Other expenses / (income)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	$ 0	$ (1)	$ 0
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Immediate Recognition of Actuarial Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other expenses / (income)	Other expenses / (income)	Other expenses / (income)
Defined Benefit Plan, Actuarial (Gain) Loss	$ 33	$ (6)	$ 80
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	31	(19)	27
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Defined Benefit Plan, Service Cost	$ 0	$ 0	$ 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Interest Cost, Statement of Income or Comprehensive Income [Extensible Enumeration]	Other expenses / (income)	Other expenses / (income)	Other expenses / (income)
Defined Benefit Plan, Interest Cost	$ 8	$ 7	$ 3
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Expected Return (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other expenses / (income)	Other expenses / (income)	Other expenses / (income)
Expected return on plan assets	$ 0	$ 0	$ 0
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Amortization of Prior Service Cost (Credit), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other expenses / (income)	Other expenses / (income)	Other expenses / (income)
Defined Benefit Plan, Amortization of Prior Service Cost (Credit)	$ 0	$ 1	$ 1
Defined Benefit Plan, Net Periodic Benefit (Cost) Credit, Immediate Recognition of Actuarial Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration]	Other expenses / (income)	Other expenses / (income)	Other expenses / (income)
Defined Benefit Plan, Actuarial (Gain) Loss	$ 0	$ (9)	$ (36)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	$ 8	$ (3)	$ (34)