Pension And Postretirement Benefits (Schedule Of Pension Plan Assets By Category) (Details) - USD ($) $ in Millions	Jul. 31, 2016		Aug. 02, 2015	Aug. 03, 2014
Defined Benefit Plan, Fair Value of Plan Assets Sub-Total	$ 1,447		$ 1,533
Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Fair Value of Plan Assets	2,111		2,316	$ 2,364
Alternative Investments, Fair Value Disclosure	691		805
Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	676		738
Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	720		750
Pension Plan, Defined Benefit [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	51		45	$ 33
Pension Plan, Defined Benefit [Member] | Short-term Investments [Member]
Defined Benefit Plan, Fair Value of Plan Assets	43		32
Alternative Investments, Fair Value Disclosure	20		28
Pension Plan, Defined Benefit [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	41		32
Pension Plan, Defined Benefit [Member] | Short-term Investments [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	2		0
Pension Plan, Defined Benefit [Member] | Municipal Bonds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	67		68
Pension Plan, Defined Benefit [Member] | Municipal Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	67		68
Pension Plan, Defined Benefit [Member] | Asset-backed Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	7		9
Pension Plan, Defined Benefit [Member] | Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	7		9
Pension Plan, Defined Benefit [Member] | Real Estate [Member]
Defined Benefit Plan, Fair Value of Plan Assets	19		14
Pension Plan, Defined Benefit [Member] | Real Estate [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	13		8
Pension Plan, Defined Benefit [Member] | Real Estate [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	6		6
Pension Plan, Defined Benefit [Member] | Hedge Funds [Member]
Defined Benefit Plan, Fair Value of Plan Assets	45		39
Alternative Investments, Fair Value Disclosure	144	[1]	175
Pension Plan, Defined Benefit [Member] | Hedge Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	45		39
Pension Plan, Defined Benefit [Member] | Derivative Financial Instruments, Assets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	6		5
Pension Plan, Defined Benefit [Member] | Derivative Financial Instruments, Assets [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	6		5
Pension Plan, Defined Benefit [Member] | Derivative Financial Instruments, Liabilities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	(7)		(6)
Pension Plan, Defined Benefit [Member] | Derivative Financial Instruments, Liabilities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	(7)		(6)
Pension Plan, Defined Benefit [Member] | Equity Funds [Member]
Alternative Investments, Fair Value Disclosure	309		375
Pension Plan, Defined Benefit [Member] | Fixed Income Funds [Member]
Alternative Investments, Fair Value Disclosure	31		31
Pension Plan, Defined Benefit [Member] | Blended Funds [Member]
Alternative Investments, Fair Value Disclosure	79		79
Pension Plan, Defined Benefit [Member] | Real Estate Funds [Member]
Alternative Investments, Fair Value Disclosure	108	[2]	117
Pension Plan, Defined Benefit [Member] | Other Items To Reconcile To Fair Value Of Plan Assets [Member]
Defined Benefit Plan, Fair Value of Plan Assets	(27)		(22)
Pension Plan, Defined Benefit [Member] | UNITED STATES | Equity [Member]
Defined Benefit Plan, Fair Value of Plan Assets	349		386
Pension Plan, Defined Benefit [Member] | UNITED STATES | Equity [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	349		386
Pension Plan, Defined Benefit [Member] | UNITED STATES | Corporate Debt Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	469		494
Pension Plan, Defined Benefit [Member] | UNITED STATES | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	469		494
Pension Plan, Defined Benefit [Member] | UNITED STATES | US Treasury and Government [Member]
Defined Benefit Plan, Fair Value of Plan Assets	49		42
Pension Plan, Defined Benefit [Member] | UNITED STATES | US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	49		42
Pension Plan, Defined Benefit [Member] | Non-U.S. [Member] | Equity [Member]
Defined Benefit Plan, Fair Value of Plan Assets	273		312
Pension Plan, Defined Benefit [Member] | Non-U.S. [Member] | Equity [Member] | Fair Value, Inputs, Level 1 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	273		312
Pension Plan, Defined Benefit [Member] | Non-U.S. [Member] | Corporate Debt Securities [Member]
Defined Benefit Plan, Fair Value of Plan Assets	98		102
Pension Plan, Defined Benefit [Member] | Non-U.S. [Member] | Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	98		102
Pension Plan, Defined Benefit [Member] | Non-U.S. [Member] | US Treasury and Government [Member]
Defined Benefit Plan, Fair Value of Plan Assets	29		36
Pension Plan, Defined Benefit [Member] | Non-U.S. [Member] | US Treasury and Government [Member] | Fair Value, Inputs, Level 2 [Member]
Defined Benefit Plan, Fair Value of Plan Assets	$ 29		$ 36

[1] Includes a fund valued at $45 which is being liquidated. Distributions from the fund will be received as the underlying investments are liquidated which is estimated to occur by December 31, 2016.

[2] Includes real estate investments valued at $34 for which a redemption queue has been imposed by the investment manager increasing the redemption receipt period to up to 9 months after notice.