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BENEFIT PLANS - Fair Value of Defined Benefit Pension Plans Assets (Details) - USD ($)
$ in Millions
Jul. 31, 2021
Aug. 01, 2020
Defined Benefit Plan Disclosure [Line Items]    
Plan assets $ 2,118 $ 1,991
Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 114 345
Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 1,764 1,414
Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Measured at NAV as a Practical Expedient    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 240 232
Common stock    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 103 334
Common stock | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 103 334
Common stock | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Common stock | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Common stock | Measured at NAV as a Practical Expedient    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Common collective trusts    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 1,105 961
Common collective trusts | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Common collective trusts | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 1,044 902
Common collective trusts | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Common collective trusts | Measured at NAV as a Practical Expedient    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 61 59
Corporate bonds    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 432 311
Corporate bonds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Corporate bonds | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 432 311
Corporate bonds | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Corporate bonds | Measured at NAV as a Practical Expedient    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Government securities    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 218 131
Government securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Government securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 218 131
Government securities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Government securities | Measured at NAV as a Practical Expedient    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Mutual funds    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 58 43
Mutual funds | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Mutual funds | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 58 43
Mutual funds | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Mutual funds | Measured at NAV as a Practical Expedient    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Mortgage-backed securities    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 2 4
Mortgage-backed securities | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Mortgage-backed securities | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 2 4
Mortgage-backed securities | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Mortgage-backed securities | Measured at NAV as a Practical Expedient    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Other    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 21 34
Other | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 11 11
Other | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 10 23
Other | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Other | Measured at NAV as a Practical Expedient    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Private equity and real estate partnerships    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 179 173
Private equity and real estate partnerships | Level 1    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Private equity and real estate partnerships | Level 2    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Private equity and real estate partnerships | Level 3    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets 0 0
Private equity and real estate partnerships | Measured at NAV as a Practical Expedient    
Defined Benefit Plan Disclosure [Line Items]    
Plan assets $ 179 $ 173