Fair Value Measurements Fair Value Measurements Narrative (Details) - USD ($) $ in Millions	Oct. 29, 2017	Jul. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 9	$ 8
Long-term Debt	2,484	2,499
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Fair Value Disclosure	9	8
Long-term Debt, Fair Value	$ 2,549	$ 2,582