Restructuring (Composition of Restructuring Charges) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	May 01, 2021	May 02, 2020	May 01, 2021
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (48)	$ 1
Mexico Exit And Corporate Reorganization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(48)		$ 229
Mexico Exit And Corporate Reorganization [Member] | Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(6)
Mexico Exit And Corporate Reorganization [Member] | Domestic [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(44)		89
Mexico Exit And Corporate Reorganization [Member] | International [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(4)		140
Mexico Exit And Corporate Reorganization [Member] | Inventory Markdowns [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(6)
Mexico Exit And Corporate Reorganization [Member] | Inventory Markdowns [Member] | Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			17
Mexico Exit And Corporate Reorganization [Member] | Inventory Markdowns [Member] | International [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(6)
Mexico Exit And Corporate Reorganization [Member] | Inventory Markdowns [Member] | International [Member] | Cost of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			17
Mexico Exit And Corporate Reorganization [Member] | Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3
Mexico Exit And Corporate Reorganization [Member] | Asset Impairments [Member] | Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			70
Mexico Exit And Corporate Reorganization [Member] | Asset Impairments [Member] | Domestic [Member] | Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			10
Mexico Exit And Corporate Reorganization [Member] | Asset Impairments [Member] | International [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	3
Mexico Exit And Corporate Reorganization [Member] | Asset Impairments [Member] | International [Member] | Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			60
Mexico Exit And Corporate Reorganization [Member] | Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(45)
Mexico Exit And Corporate Reorganization [Member] | Termination Benefits [Member] | Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			98
Mexico Exit And Corporate Reorganization [Member] | Termination Benefits [Member] | Domestic [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	(44)
Mexico Exit And Corporate Reorganization [Member] | Termination Benefits [Member] | Domestic [Member] | Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			79
Mexico Exit And Corporate Reorganization [Member] | Termination Benefits [Member] | International [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ (1)
Mexico Exit And Corporate Reorganization [Member] | Termination Benefits [Member] | International [Member] | Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			19
Mexico Exit And Corporate Reorganization [Member] | Currency Translation Adjustment [Member] | Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			39
Mexico Exit And Corporate Reorganization [Member] | Currency Translation Adjustment [Member] | International [Member] | Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			39
Mexico Exit And Corporate Reorganization [Member] | Other [Member] | Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			5
Mexico Exit And Corporate Reorganization [Member] | Other [Member] | International [Member] | Restructuring Charges [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges			$ 5
U.S. Operating Model [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges		$ 1