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Taxes on Earnings - Schedule of (Benefit from) Provision for Taxes on Earnings (Details) - USD ($)
$ in Millions
12 Months Ended
Oct. 31, 2018
Oct. 31, 2017
Oct. 31, 2016
U.S. federal taxes:      
Current $ 751 $ 189 $ 439
Deferred (3,132) 197 470
Non-U.S. taxes:      
Current 528 302 288
Deferred (563) 4 (123)
State taxes:      
Current 61 20 (35)
Deferred 41 38 56
Provision for (benefit from) taxes $ (2,314) $ 750 $ 1,095