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Debt Instrument, Covenant, Debt To EBITDA Ratio, Maximum

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Debt Instrument, Covenant, EBITDA To Annual Interest Expense Ratio, Minimum

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Debt Instrument, Maturity Date Extension

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Line Of Credit Facility, Increase Limit

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Line of Credit Facility, Face Amount

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Master Credit Agreement Amount

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Amount of short-term debt and current maturity of long-term debt and capital lease obligations due within one year or the normal operating cycle, if longer.

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Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The amount of cash paid for interest during the period.

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Fair value of the amount outstanding under the credit facility.

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Amount of long-term debt and capital lease obligations including current maturities.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Current Liabilities (Details)		3 Months Ended	6 Months Ended
Current Liabilities (Details)	Feb. 01, 2016 USD ($)	Jan. 31, 2017 USD ($)	Jan. 31, 2017 USD ($)	Jan. 31, 2016 USD ($)	Jul. 31, 2016 USD ($)	Mar. 12, 2007 USD ($)
Current Liabilities (Textuals)
Short-term debt		$ 687,000,000	$ 687,000,000		$ 512,000,000
Cash paid for interest on the LOC			14,000,000	$ 14,000,000
Proceeds from borrowings under revolving credit facilities			150,000,000	745,000,000
Revolving Credit Facility \| Line of Credit
Current Liabilities (Textuals)
Cash paid for interest on the LOC				$ 1,000,000
Term Loan
Current Liabilities (Textuals)
Cash paid for interest on the LOC			5,000,000
5.75 percent fixed-rate notes due 2017
Debt Instrument [Line Items]
Senior notes						$ 500,000,000
Interest rate stated percentage						5.75%
February 1, 2016 Credit Agreement
Debt Instrument [Line Items]
Debt instrument, term	5 years
Current Liabilities (Textuals)
Master credit agreement	$ 1,500,000,000
February 1, 2016 Credit Agreement \| Line of Credit
Current Liabilities (Textuals)
Debt to EBITDA ratio (not greater than)	3.25
EBITDA to interest payable ratio (not less than)	3.00
February 1, 2016 Credit Agreement \| Revolving Credit Facility \| Line of Credit
Current Liabilities (Textuals)
Cash paid for interest on the LOC			1,000,000
Unsecured revolving credit facility	$ 1,000,000,000
Revolving credit facility, increase limit	$ 250,000,000
Unsecured revolving credit facility extension	2
Proceeds from borrowings under revolving credit facilities		150,000,000
Fair value of amount outstanding		150,000,000	150,000,000
February 1, 2016 Credit Agreement \| Term Loan \| Line of Credit
Current Liabilities (Textuals)
Unsecured term loan	$ 500,000,000	500,000,000	500,000,000
Short-term debt		$ 37,000,000	$ 37,000,000
Base Rate \| February 1, 2016 Credit Agreement \| Revolving Credit Facility \| Line of Credit \| Minimum
Current Liabilities (Textuals)
Basis spread on variable rate	0.00%
Base Rate \| February 1, 2016 Credit Agreement \| Revolving Credit Facility \| Line of Credit \| Maximum
Current Liabilities (Textuals)
Basis spread on variable rate	0.50%
Base Rate \| February 1, 2016 Credit Agreement \| Term Loan \| Line of Credit \| Minimum
Current Liabilities (Textuals)
Basis spread on variable rate	0.125%
Base Rate \| February 1, 2016 Credit Agreement \| Term Loan \| Line of Credit \| Maximum
Current Liabilities (Textuals)
Basis spread on variable rate	0.875%
LIBOR \| February 1, 2016 Credit Agreement \| Revolving Credit Facility \| Line of Credit \| Minimum
Current Liabilities (Textuals)
Basis spread on variable rate	0.90%
LIBOR \| February 1, 2016 Credit Agreement \| Revolving Credit Facility \| Line of Credit \| Maximum
Current Liabilities (Textuals)
Basis spread on variable rate	1.50%
LIBOR \| February 1, 2016 Credit Agreement \| Term Loan \| Line of Credit \| Minimum
Current Liabilities (Textuals)
Basis spread on variable rate	1.125%
LIBOR \| February 1, 2016 Credit Agreement \| Term Loan \| Line of Credit \| Maximum
Current Liabilities (Textuals)
Basis spread on variable rate	1.875%