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BENEFIT PLANS - Net Periodic Benefit (Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Jul. 31, 2021
Aug. 01, 2020
Aug. 03, 2019
Pension Benefits      
Net Periodic Benefit (Income) Cost      
Expected return on plan assets $ (104) $ (105) $ (112)
Interest cost 37 57 76
Settlement (gain) charge 0 11 0
Amortization of prior service credit 0 0 0
Amortization of net actuarial loss (gain) 1 0 0
Net periodic benefit (income) cost (66) (37) (36)
Other Changes in Plan Assets and Benefits Obligations Recognized in Other Comprehensive Income (Loss)      
Net actuarial (gain) loss (225) 109 58
Prior service cost (benefit) 0 0 0
Amortization of prior service benefit 0 0 0
Amortization of net actuarial (gain) loss (1) 0 0
Total (benefit) expense recognized in Other comprehensive income (loss) (226) 109 58
Total (benefit) expense recognized in net periodic benefit cost (income) and Other comprehensive income (loss) (292) 72 22
Other Postretirement Benefits      
Net Periodic Benefit (Income) Cost      
Expected return on plan assets 0 0 0
Interest cost 0 1 1
Settlement (gain) charge (17) 0 0
Amortization of prior service credit (1) (1) 0
Amortization of net actuarial loss (gain) (1) (2) 0
Net periodic benefit (income) cost (19) (2) 1
Other Changes in Plan Assets and Benefits Obligations Recognized in Other Comprehensive Income (Loss)      
Net actuarial (gain) loss (8) 0 (10)
Prior service cost (benefit) 25 0 (4)
Amortization of prior service benefit 3 1 0
Amortization of net actuarial (gain) loss 1 2 0
Total (benefit) expense recognized in Other comprehensive income (loss) 21 3 (14)
Total (benefit) expense recognized in net periodic benefit cost (income) and Other comprehensive income (loss) $ 2 $ 1 $ (13)