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Borrowings-Other (Details) - USD ($)
$ in Millions
Apr. 30, 2016
Nov. 01, 2015
Commercial paper program    
Debt instruments    
Aggregate principal amount   $ 4,000
Credit facilities    
Debt instruments    
Available borrowing resources $ 843  
Revolving credit facility    
Debt instruments    
Maximum borrowing capacity under credit facility $ 4,000