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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 - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Apr. 28, 2018
Apr. 29, 2017
Apr. 28, 2018
Apr. 29, 2017
Hedge Underlying Gain Loss [Line Items]        
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS $ (34) $ (6) $ (192) $ (272)
GAINS (LOSSES) RELATED TO HEDGED ITEMS 33 7 191 269
Interest rate derivatives | Interest expense        
Hedge Underlying Gain Loss [Line Items]        
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS (59) (6) (168) (272)
GAINS (LOSSES) RELATED TO HEDGED ITEMS 58 7 167 269
Equity derivatives | Other income (loss), net        
Hedge Underlying Gain Loss [Line Items]        
GAINS (LOSSES) ON DERIVATIVE INSTRUMENTS 25 0 (24) 0
GAINS (LOSSES) RELATED TO HEDGED ITEMS $ (25) $ 0 $ 24 $ 0