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Borrowings - Additional Information (Detail) (USD $)
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3 Months Ended | 12 Months Ended | |
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Oct. 27, 2012
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Jul. 30, 2011
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Jul. 28, 2012
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| Subordinated Borrowing [Line Items] | |||
| Credit Facility Interest Rate | either (i) the higher of the Federal Funds rate plus 0.50%, Bank of America's "prime rate" as announced from time to time, or one-month LIBOR plus 1.00%, or (ii) LIBOR plus a margin that is based on the Company's senior debt credit ratings | ||
| Short-term debt financing program, announced value | $ 3,000,000,000 | ||
| Notional amount of interest rate derivatives | 4,250,000,000 | 4,250,000,000 | |
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Senior Notes Issued 2006 and 2011 [Member]
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| Subordinated Borrowing [Line Items] | |||
| Notional amount of interest rate derivatives | 4,250,000,000 | ||
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Unsecured Revolving Credit Facility [Member]
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| Subordinated Borrowing [Line Items] | |||
| Unsecured Revolving Credit Facility | 3,000,000,000 | ||
| Unsecured revolving credit facility maturity date | February 17, 2017 | ||
| Interest Rate- Federal Funds rate plus 0.5% | 0.50% | ||
| Interest Rate- One-month LIBOR plus 1.00% | 1.00% | ||
| Available increases under the credit facility | $ 2,000,000,000 | ||
| Increase to maximum borrowing capacity- maturity date | Feb. 17, 2019 |