Acquistions Pro forma Information (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
		Jul. 28, 2019	Jul. 29, 2018	Jul. 30, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Combination, Acquisition Related Costs	[1]	$ 0	$ 53	$ 0
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net		$ (3)	24	0
Business Acquisition, Pro Forma Revenue			8,152	8,271
Business Acquisition, Pro Forma Net Income (Loss)			$ 834	$ 810
Business Acquisition, Pro Forma Earnings Per Share, Basic			$ 2.77	$ 2.66
Business Acquisition, Pro Forma Earnings Per Share, Diluted			$ 2.76	$ 2.64
Pro Forma [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Business Combination, Acquisition Related Costs				$ 53
Business Combination Amortization of Inventory Fair Value Adjustment				42
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net				$ 18

[1] In 2018, we recognized transaction costs of $53 related to the acquisition of Snyder's-Lance. See Note 4 for additional information.