Short-term Borrowings and Long-term Debt Short-term Borrowings and Long-term Debt (Schedule of Short-term Debt) (Details) (USD $) In Millions, unless otherwise specified	Aug. 03, 2014		Jul. 28, 2013
Short-term Debt [Line Items]
Commercial Paper	$ 1,406		$ 1,162
Notes Payable, Current	300		700
Capital Lease Obligations, Current	1		2
Other Short-term Borrowings	0	[1]	1	[1]
Debt, Current	1,771		1,909
Variable Interest Rate [Member]
Short-term Debt [Line Items]
Short-term Debt	47		44
Fixed Interest Rate [Member]
Short-term Debt [Line Items]
Short-term Debt	$ 17		$ 0

[1] Other includes unamortized net premium/discount on debt issuances and amounts related to interest rate swaps designated as fair-value hedges. For additional information on fair-value interest rate swaps, see Note 14.