Fair Value Measurements Fair Value Measurements Narrative (Details) - USD ($) $ in Millions	Jan. 31, 2021	Aug. 02, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, at Carrying Value	$ 200	$ 157
Debt, Long-term and Short-term, Combined Amount	6,021	6,196
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	200	157
Debt, Long-term and Short-term, Combined Fair Value	$ 6,670	$ 6,995