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Financial Instruments - Pre-tax Effect of Derivative Instruments and Related Hedged Items in a Fair Value Hedging Relationship (Details) - USD ($)
$ in Millions
3 Months Ended
Jan. 31, 2019
Jan. 31, 2018
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (Losses) Recognized in Other Comprehensive Income (OCI) on Derivatives (Effective Portion) $ 34 $ (181)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest 655 (657)
Interest rate contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (Losses) Recognized in Earnings on Derivative 158 (138)
Gains (Losses) Recognized in Earnings on Related Hedged Item (158) 138
Cash flow hedges | Foreign exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (Losses) Recognized in Other Comprehensive Income (OCI) on Derivatives (Effective Portion) 34 (181)
Interest and other, net | Cash flow hedges | Foreign exchange contracts    
Derivative Instruments, Gain (Loss) [Line Items]    
Gains (Losses) Recognized in Other Comprehensive Income (OCI) on Derivatives (Effective Portion) $ 71 $ (2)