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Fair Value (Details) - USD ($)
$ in Millions
Oct. 31, 2018
Oct. 31, 2017
Assets:    
Fair Value $ 3,996 $ 5,398
Derivative Instruments 515 121
Liabilities:    
Derivative Instruments 195 372
Fair value, short- and long-term debt 6,000 8,100
Carrying value, short- and long-term debt 6,000 7,800
Fair value measured on a recurring basis    
Assets:    
Total Assets 5,275 6,729
Liabilities:    
Total Liabilities 195 372
Fair value measured on a recurring basis | Corporate Debt    
Assets:    
Fair Value 1,620 1,390
Available-for-Sale Investments 366 629
Fair value measured on a recurring basis | Financial institution instruments    
Assets:    
Fair Value 9 6
Available-for-Sale Investments 32 78
Fair value measured on a recurring basis | Government debt    
Assets:    
Fair Value 2,367 4,002
Available-for-Sale Investments 313 442
Fair value measured on a recurring basis | Mutual funds    
Assets:    
Available-for-Sale Investments 47 49
Fair value measured on a recurring basis | Marketable equity securities    
Assets:    
Available-for-Sale Investments 6 12
Fair value measured on a recurring basis | Interest rate contracts    
Assets:    
Derivative Instruments 0 0
Liabilities:    
Derivative Instruments 23 12
Fair value measured on a recurring basis | Foreign currency contracts    
Assets:    
Derivative Instruments 515 120
Liabilities:    
Derivative Instruments 164 360
Fair value measured on a recurring basis | Other derivatives    
Assets:    
Derivative Instruments 0 1
Liabilities:    
Derivative Instruments 8 0
Fair value measured on a recurring basis | Level 1    
Assets:    
Total Assets 2,270 3,957
Liabilities:    
Total Liabilities 0 0
Fair value measured on a recurring basis | Level 1 | Corporate Debt    
Assets:    
Fair Value 0 0
Available-for-Sale Investments 0 0
Fair value measured on a recurring basis | Level 1 | Financial institution instruments    
Assets:    
Fair Value 0 0
Available-for-Sale Investments 0 0
Fair value measured on a recurring basis | Level 1 | Government debt    
Assets:    
Fair Value 2,217 3,902
Available-for-Sale Investments 0 0
Fair value measured on a recurring basis | Level 1 | Mutual funds    
Assets:    
Available-for-Sale Investments 47 49
Fair value measured on a recurring basis | Level 1 | Marketable equity securities    
Assets:    
Available-for-Sale Investments 6 6
Fair value measured on a recurring basis | Level 1 | Interest rate contracts    
Assets:    
Derivative Instruments 0 0
Liabilities:    
Derivative Instruments 0 0
Fair value measured on a recurring basis | Level 1 | Foreign currency contracts    
Assets:    
Derivative Instruments 0 0
Liabilities:    
Derivative Instruments 0 0
Fair value measured on a recurring basis | Level 1 | Other derivatives    
Assets:    
Derivative Instruments 0 0
Liabilities:    
Derivative Instruments 0 0
Fair value measured on a recurring basis | Level 2    
Assets:    
Total Assets 2,998 2,762
Liabilities:    
Total Liabilities 195 370
Fair value measured on a recurring basis | Level 2 | Corporate Debt    
Assets:    
Fair Value 1,620 1,390
Available-for-Sale Investments 366 629
Fair value measured on a recurring basis | Level 2 | Financial institution instruments    
Assets:    
Fair Value 9 6
Available-for-Sale Investments 32 78
Fair value measured on a recurring basis | Level 2 | Government debt    
Assets:    
Fair Value 150 100
Available-for-Sale Investments 313 442
Fair value measured on a recurring basis | Level 2 | Mutual funds    
Assets:    
Available-for-Sale Investments 0 0
Fair value measured on a recurring basis | Level 2 | Marketable equity securities    
Assets:    
Available-for-Sale Investments 0 6
Fair value measured on a recurring basis | Level 2 | Interest rate contracts    
Assets:    
Derivative Instruments 0 0
Liabilities:    
Derivative Instruments 23 12
Fair value measured on a recurring basis | Level 2 | Foreign currency contracts    
Assets:    
Derivative Instruments 508 110
Liabilities:    
Derivative Instruments 164 358
Fair value measured on a recurring basis | Level 2 | Other derivatives    
Assets:    
Derivative Instruments 0 1
Liabilities:    
Derivative Instruments 8 0
Fair value measured on a recurring basis | Level 3    
Assets:    
Total Assets 7 10
Liabilities:    
Total Liabilities 0 2
Fair value measured on a recurring basis | Level 3 | Corporate Debt    
Assets:    
Fair Value 0 0
Available-for-Sale Investments 0 0
Fair value measured on a recurring basis | Level 3 | Financial institution instruments    
Assets:    
Fair Value 0 0
Available-for-Sale Investments 0 0
Fair value measured on a recurring basis | Level 3 | Government debt    
Assets:    
Fair Value 0 0
Available-for-Sale Investments 0 0
Fair value measured on a recurring basis | Level 3 | Mutual funds    
Assets:    
Available-for-Sale Investments 0 0
Fair value measured on a recurring basis | Level 3 | Marketable equity securities    
Assets:    
Available-for-Sale Investments 0 0
Fair value measured on a recurring basis | Level 3 | Interest rate contracts    
Assets:    
Derivative Instruments 0 0
Liabilities:    
Derivative Instruments 0 0
Fair value measured on a recurring basis | Level 3 | Foreign currency contracts    
Assets:    
Derivative Instruments 7 10
Liabilities:    
Derivative Instruments 0 2
Fair value measured on a recurring basis | Level 3 | Other derivatives    
Assets:    
Derivative Instruments 0 0
Liabilities:    
Derivative Instruments $ 0 $ 0