Pension And Postretirement Benefits (Schedule Of Pension Plan Assets By Category) (Details) - Pension Plan, Defined Benefit [Member] - USD ($) $ in Millions	Aug. 02, 2020	Jul. 28, 2019	Jul. 29, 2018
Defined Benefit Plan, Plan Assets, Amount	$ 2,120	$ 2,153	$ 2,154
Defined Benefit Plan, Fair Value of Plan Assets Sub-Total	1,618	1,580
Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Amount	547	521
Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	1,037	1,023
Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	34	36	40
Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Amount	568	644
Short-term Investments [Member]
Defined Benefit Plan, Plan Assets, Amount	42	78
Short-term Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Amount	42	32
Short-term Investments [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	0	46
Short-term Investments [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Amount	22	23
Equity Securities, US [Member]
Defined Benefit Plan, Plan Assets, Amount	261	267
Equity Securities, US [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Amount	261	267
Equity Securities , Non-US [Member]
Defined Benefit Plan, Plan Assets, Amount	240	217
Equity Securities , Non-US [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Amount	240	217
Corporate Bonds, US [Member]
Defined Benefit Plan, Plan Assets, Amount	749	635
Corporate Bonds, US [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	749	635
Corporate Bonds, Non-US [Member]
Defined Benefit Plan, Plan Assets, Amount	130	142
Corporate Bonds, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	130	142
US Treasury and Government [Member]
Defined Benefit Plan, Plan Assets, Amount	74	73
US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	74	73
Debt Security, Government, Non-US [Member]
Defined Benefit Plan, Plan Assets, Amount	24	29
Debt Security, Government, Non-US [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	24	29
Municipal Bonds [Member]
Defined Benefit Plan, Plan Assets, Amount	30	64
Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	30	64
Asset-backed Securities [Member]
Defined Benefit Plan, Plan Assets, Amount	34	36
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	34	36
Real Estate [Member]
Defined Benefit Plan, Plan Assets, Amount	7	9
Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Plan Assets, Amount	4	5
Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	3	4	6
Hedge Funds [Member]
Defined Benefit Plan, Plan Assets, Amount	31	32
Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Plan Assets, Amount	31	32	$ 34
Hedge Funds [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Amount	61	76
Derivative Financial Instruments, Assets [Member]
Defined Benefit Plan, Plan Assets, Amount	2	4
Derivative Financial Instruments, Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	2	4
Derivative Financial Instruments, Liabilities [Member]
Defined Benefit Plan, Plan Assets, Amount	(6)	(6)
Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Plan Assets, Amount	(6)	(6)
Equity Funds [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Amount	262	319
Fixed Income Funds [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Amount	139	35
Blended Funds [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Amount	0	84
Real Estate Funds [Member] | Fair Value Measured at Net Asset Value Per Share
Defined Benefit Plan, Plan Assets, Amount	84	107
Other Items To Reconcile To Fair Value Of Plan Assets [Member]
Defined Benefit Plan, Plan Assets, Amount	$ (66)	$ (71)