Share Repurchases (Narrative) (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Oct. 31, 2021	Nov. 01, 2020
Statement [Line Items]
Shares repurchased, value	$ 63	$ 0
Capital Stock In Treasury [Member]
Statement [Line Items]
Treasury stock purchased, Shares	1.5	0.0
Shares repurchased, value	$ 63	$ 0
June 2021 Program
Statement [Line Items]
Authorized amount for shares repurchase	250
Stock Repurchase Program, Remaining Authorized Repurchase Amount	176
June 2021 Program | Capital Stock In Treasury [Member]
Statement [Line Items]
Shares repurchased, value	38
September 2021 Program
Statement [Line Items]
Authorized amount for shares repurchase	500
Stock Repurchase Program, Remaining Authorized Repurchase Amount	475
September 2021 Program | Capital Stock In Treasury [Member]
Statement [Line Items]
Shares repurchased, value	25
March 2017 Program - Canceled September 2021
Statement [Line Items]
Authorized amount for shares repurchase	$ 1,500