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Borrowings - Narrative (Details) - USD ($)
3 Months Ended
Jan. 31, 2017
Jan. 31, 2016
Nov. 01, 2015
Debt Disclosure [Abstract]      
Interest expense $ 73,000,000 $ 74,000,000  
Commercial paper program      
Line of Credit Facility [Line Items]      
Aggregate principal amount     $ 4,000,000,000
Revolving credit facility      
Line of Credit Facility [Line Items]      
Maximum borrowing capacity under credit facility 4,000,000,000    
Credit facilities      
Line of Credit Facility [Line Items]      
Available borrowing resources $ 950,000,000