Fair Value Measurements (Fair Value Measurement Of Assets And Liabilities) (Details) (Measured On Recurring Basis [Member], USD $) In Millions, unless otherwise specified	Feb. 01, 2015		Aug. 03, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	$ 54		$ 15
Total liabilities at fair value	192		146
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0		1
Total liabilities at fair value	151		134
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	54		14
Total liabilities at fair value	41		12
Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	[1]	11	[1]
Total liabilities at fair value	38	[1]	0	[1]
Interest Rate Contract [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	[1]	11	[1]
Total liabilities at fair value	38	[1]	0	[1]
Foreign Exchange Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	13	[2]	2	[2]
Total liabilities at fair value	2	[2]	3	[2]
Foreign Exchange Forward Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	13	[2]	2	[2]
Total liabilities at fair value	2	[2]	3	[2]
Commodity Derivative Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	[3]	2	[3]
Total liabilities at fair value	20	[3]	11	[3]
Commodity Derivative Contracts [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	[3]	1	[3]
Total liabilities at fair value	20	[3]	11	[3]
Commodity Derivative Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	0	[3]	1	[3]
Total liabilities at fair value	0	[3]	0	[3]
Currency Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	40	[4]	0	[4]
Total liabilities at fair value	0	[4]	6	[4]
Currency Swap [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	40	[4]	0	[4]
Total liabilities at fair value	0	[4]	6	[4]
Deferred Compensation Derivative Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	1	[5]	0	[5]
Total liabilities at fair value	1	[5]	3	[5]
Deferred Compensation Derivative Contracts [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset	1	[5]	0	[5]
Total liabilities at fair value	1	[5]	3	[5]
Deferred Compensation Obligation [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value	131	[6]	123	[6]
Deferred Compensation Obligation [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value	$ 131	[6]	$ 123	[6]

[1] Based on LIBOR swap rates.

[2] Based on observable market transactions of spot currency rates and forward rates.

[3] Based on quoted futures exchanges and on observable prices of futures and options transactions in the marketplace.

[4] Based on observable local benchmarks for currency and interest rates.

[5] Based on LIBOR and equity index swap rates.

[6] Based on the fair value of the participants’ investments.