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Borrowings - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Jul. 31, 2016
Jul. 31, 2015
Jul. 31, 2016
Jul. 31, 2015
Nov. 01, 2015
Debt Disclosure [Abstract]          
Interest expense $ 71 $ 53 $ 203 $ 109  
Commercial paper program          
Line of Credit Facility [Line Items]          
Aggregate principal amount         $ 4,000
Revolving credit facility          
Line of Credit Facility [Line Items]          
Maximum borrowing capacity under credit facility 4,000   4,000    
Credit facilities          
Line of Credit Facility [Line Items]          
Available borrowing resources $ 833   $ 833