Fair Value Measurements (Fair Value Measurement Of Assets And Liabilities) (Details) (Measured on Recurring Basis [Member], USD $) In Millions	Jul. 31, 2011		Aug. 01, 2010
Total assets at fair value	$ 37		$ 69
Total liabilities at fair value	287		192
Foreign Exchange Contracts [Member]
Total assets at fair value			2	[1]
Total liabilities at fair value	9	[1]	2	[1]
Equity Contracts [Member]
Total liabilities at fair value	3	[2]	2	[2]
Equity Contracts [Member] | Level 1 [Member]
Total liabilities at fair value				[2]
Level 3 [Member] | Foreign Exchange Contracts [Member]
Total assets at fair value				[1]
Total liabilities at fair value				[1]
Foreign Exchange Contracts [Member] | Level 2 [Member]
Total assets at fair value			2	[1]
Total liabilities at fair value	9	[1]	2	[1]
Level 3 [Member] | Interest Rate Swaps [Member]
Total assets at fair value				[3]
Level 3 [Member] | Equity Contracts [Member]
Total liabilities at fair value				[2]
Level 3 [Member]
Total assets at fair value
Total liabilities at fair value
Level 3 [Member] | Commodity Derivative Contracts [Member]
Total assets at fair value				[4]
Total liabilities at fair value				[4]
Level 3 [Member] | Deferred Compensation Obligation [Member]
Total liabilities at fair value				[5]
Foreign Exchange Contracts [Member] | Level 1 [Member]
Total assets at fair value				[1]
Total liabilities at fair value				[1]
Equity Contracts [Member] | Level 2 [Member]
Total liabilities at fair value	3	[2]	2	[2]
Commodity Derivative Contracts [Member]
Total assets at fair value	3	[4]	4	[4]
Total liabilities at fair value	2	[4]	1	[4]
Commodity Derivative Contracts [Member] | Level 1 [Member]
Total assets at fair value	3	[4]	4	[4]
Total liabilities at fair value	2	[4]	1	[4]
Commodity Derivative Contracts [Member] | Level 2 [Member]
Total assets at fair value				[4]
Total liabilities at fair value				[4]
Cross-currency Swap Contracts [Member]
Total assets at fair value	1	[6]	17	[6]
Total liabilities at fair value	129	[6]	38	[6]
Cross-currency Swap Contracts [Member] | Level 1 [Member]
Total assets at fair value				[6]
Total liabilities at fair value				[6]
Cross-currency Swap Contracts [Member] | Level 3 [Member]
Total assets at fair value				[6]
Total liabilities at fair value				[6]
Cross-currency Swap Contracts [Member] | Level 2 [Member]
Total assets at fair value	1	[6]	17	[6]
Total liabilities at fair value	129	[6]	38	[6]
Level 1 [Member]
Total assets at fair value	3		4
Total liabilities at fair value	99		96
Level 1 [Member] | Interest Rate Swaps [Member]
Total assets at fair value				[3]
Level 1 [Member] | Deferred Compensation Obligation [Member]
Total liabilities at fair value	97	[5]	95	[5]
Level 2 [Member]
Total assets at fair value	34		65
Total liabilities at fair value	188		96
Level 2 [Member] | Interest Rate Swaps [Member]
Total assets at fair value	33	[3]	46	[3]
Level 2 [Member] | Deferred Compensation Obligation [Member]
Total liabilities at fair value	47	[5]	54	[5]
Interest Rate Swaps [Member]
Total assets at fair value	33	[3]	46	[3]
Deferred Compensation Obligation [Member]
Total liabilities at fair value	$ 144	[5]	$ 149	[5]

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

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

[3] Based on LIBOR swap rates.

[4] Based on quoted futures exchanges.

[5] Based on the fair value of the participants' investments.

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