Derivative Instruments - Effect of Derivative Instruments Designated as Fair Value Hedges and Underlying Hedged Items on Consolidated Statements of Operations (Details) - Derivatives Designated as Fair Value Hedging Instruments - Interest rate derivatives - Interest expense - USD ($) $ in Millions	12 Months Ended
	Jul. 27, 2019	Jul. 28, 2018	Jul. 29, 2017
Hedge Underlying Gain Loss [Line Items]
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS FOR THE YEARS ENDED	$ 145	$ (174)	$ (275)
GAINS (LOSSES) RELATED TO HEDGED ITEMS FOR THE YEARS ENDED	$ (138)	$ 173	$ 271