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Financial Instruments - Schedule of Information Related to the Potential Effect of Entity's Master Netting Agreements and Collateral Security Agreements (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2019
Oct. 31, 2018
Derivative assets    
Gross Amount Recognized $ 278 $ 515
Gross Amount Offset 0 0
Net Amount Presented 278 515
Gross Amounts Not Offset    
Derivatives 118 112
Financial Collateral 156 299
Net Amount 4 104
Derivative liabilities    
Gross Amount Recognized 220 195
Gross Amount Offset 0 0
Net Amount Presented 220 195
Gross Amounts Not Offset    
Derivatives 118 112
Financial Collateral 59 69
Net Amount $ 43 $ 14
Period to collateralize 2 days