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Fair Value (Details) - USD ($)
$ in Millions
Apr. 30, 2021
Oct. 31, 2020
Assets:    
Cash Equivalents $ 2,305 $ 3,932
Derivative Instruments 97 195
Liabilities:    
Derivative Instruments 352 262
Fair value, short- and long-term debt 6,700 6,700
Carrying value, short- and long-term debt 6,100 6,200
Corporate debt    
Assets:    
Cash Equivalents 1,374 1,700
Financial institution instruments    
Assets:    
Cash Equivalents 0 59
Government debt    
Assets:    
Cash Equivalents 931 2,173
Fair Value Measured on a Recurring Basis    
Assets:    
Total assets 2,477 4,459
Liabilities:    
Total liabilities 352 262
Fair Value Measured on a Recurring Basis | Corporate debt    
Assets:    
Cash Equivalents 1,374 1,700
Available-for-Sale Investments 0 169
Fair Value Measured on a Recurring Basis | Financial institution instruments    
Assets:    
Cash Equivalents 0 59
Available-for-Sale Investments 12 32
Fair Value Measured on a Recurring Basis | Government debt    
Assets:    
Cash Equivalents 931 2,173
Available-for-Sale Investments 0 73
Fair Value Measured on a Recurring Basis | Mutual funds    
Assets:    
Available-for-Sale Investments 63 58
Fair Value Measured on a Recurring Basis | Interest rate contracts    
Assets:    
Derivative Instruments 2 4
Liabilities:    
Derivative Instruments 9 3
Fair Value Measured on a Recurring Basis | Foreign currency contracts    
Assets:    
Derivative Instruments 93 191
Liabilities:    
Derivative Instruments 343 256
Fair Value Measured on a Recurring Basis | Other derivatives    
Assets:    
Derivative Instruments 2 0
Liabilities:    
Derivative Instruments 0 3
Fair Value Measured on a Recurring Basis | Level 1    
Assets:    
Total assets 937 1,997
Liabilities:    
Total liabilities 0 0
Fair Value Measured on a Recurring Basis | Level 1 | Corporate debt    
Assets:    
Cash Equivalents 0 0
Available-for-Sale Investments 0 0
Fair Value Measured on a Recurring Basis | Level 1 | Financial institution instruments    
Assets:    
Cash Equivalents 0 0
Available-for-Sale Investments 0 0
Fair Value Measured on a Recurring Basis | Level 1 | Government debt    
Assets:    
Cash Equivalents 931 1,992
Available-for-Sale Investments 0 0
Fair Value Measured on a Recurring Basis | Level 1 | Mutual funds    
Assets:    
Available-for-Sale Investments 6 5
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 1,540 2,462
Liabilities:    
Total liabilities 352 262
Fair Value Measured on a Recurring Basis | Level 2 | Corporate debt    
Assets:    
Cash Equivalents 1,374 1,700
Available-for-Sale Investments 0 169
Fair Value Measured on a Recurring Basis | Level 2 | Financial institution instruments    
Assets:    
Cash Equivalents 0 59
Available-for-Sale Investments 12 32
Fair Value Measured on a Recurring Basis | Level 2 | Government debt    
Assets:    
Cash Equivalents 0 181
Available-for-Sale Investments 0 73
Fair Value Measured on a Recurring Basis | Level 2 | Mutual funds    
Assets:    
Available-for-Sale Investments 57 53
Fair Value Measured on a Recurring Basis | Level 2 | Interest rate contracts    
Assets:    
Derivative Instruments 2 4
Liabilities:    
Derivative Instruments 9 3
Fair Value Measured on a Recurring Basis | Level 2 | Foreign currency contracts    
Assets:    
Derivative Instruments 93 191
Liabilities:    
Derivative Instruments 343 256
Fair Value Measured on a Recurring Basis | Level 2 | Other derivatives    
Assets:    
Derivative Instruments 2 0
Liabilities:    
Derivative Instruments 0 3
Fair Value Measured on a Recurring Basis | Level 3    
Assets:    
Total assets 0 0
Liabilities:    
Total liabilities 0 0
Fair Value Measured on a Recurring Basis | Level 3 | Corporate debt    
Assets:    
Cash Equivalents 0 0
Available-for-Sale Investments 0 0
Fair Value Measured on a Recurring Basis | Level 3 | Financial institution instruments    
Assets:    
Cash Equivalents 0 0
Available-for-Sale Investments 0 0
Fair Value Measured on a Recurring Basis | Level 3 | Government debt    
Assets:    
Cash Equivalents 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 | 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 0 0
Liabilities:    
Derivative Instruments 0 0
Fair Value Measured on a Recurring Basis | Level 3 | Other derivatives    
Assets:    
Derivative Instruments 0 0
Liabilities:    
Derivative Instruments $ 0 $ 0