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Recent Accounting Pronouncements (Narrative) (Details) - USD ($)
$ in Millions
Jan. 26, 2020
Jul. 29, 2019
Jul. 28, 2019
Jul. 29, 2018
Operating Lease, Right-of-Use Asset $ 267      
Operating Lease, Liability 263      
Plant assets, net of depreciation 2,336   $ 2,455  
Short-term borrowings 902   $ 1,371  
Other Assets [Member]        
Operating Lease, Right-of-Use Asset 267      
Accounting Standards Update 2014-09 [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption [1]       $ 8
Accounting Standards Update 2014-09 [Member] | Earnings Retained In The Business [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption       8
Accounting Standards Update 2014-09 [Member] | Accrued Liabilities [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption       (10)
Accounting Standards Update 2014-09 [Member] | Accounts Payable [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption       (1)
Accounting Standards Update 2014-09 [Member] | Other Liabilities [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption       2
Accounting Standards Update 2014-09 [Member] | Other Assets [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption       1
Accounting Standards Update 2016-02 [Member]        
Operating Lease, Right-of-Use Asset   $ 259    
Operating Lease, Liability   254    
Plant assets, net of depreciation   (20)    
Short-term borrowings $ (20) $ (20)    
Accounting Standards Update 2018-02 [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption [1]       0
Accounting Standards Update 2018-02 [Member] | Earnings Retained In The Business [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption       9
Accounting Standards Update 2018-02 [Member] | Accumulated Other Comprehensive Income (Loss) [Member]        
Cumulative Effect of New Accounting Principle in Period of Adoption       $ (9)
[1] See Note 2 for additional detail.