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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 |

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