Fair Value (Details) - USD ($) $ in Millions	Apr. 30, 2020	Oct. 31, 2019
Assets:
Cash Equivalents	$ 2,829	$ 3,705
Derivative Instruments	564	392
Liabilities:
Derivative Instruments	144	166
Fair value, short- and long-term debt	5,700	5,400
Carrying value, short- and long-term debt	5,500	5,100
Corporate debt
Assets:
Cash Equivalents	622	1,283
Government debt
Assets:
Cash Equivalents	2,207	2,422
Fair Value Measured on a Recurring Basis
Assets:
Total Assets	3,445	4,153
Liabilities:
Total Liabilities	144	166
Fair Value Measured on a Recurring Basis | Corporate debt
Assets:
Cash Equivalents	622	1,283
Fair Value Measured on a Recurring Basis | Government debt
Assets:
Cash Equivalents	2,207	2,422
Fair Value Measured on a Recurring Basis | Marketable equity securities and Mutual funds
Assets:
Available-for-Sale Investments	52	56
Fair Value Measured on a Recurring Basis | Interest rate contracts
Assets:
Derivative Instruments	14	4
Liabilities:
Derivative Instruments	8	0
Fair Value Measured on a Recurring Basis | Foreign currency contracts
Assets:
Derivative Instruments	538	381
Liabilities:
Derivative Instruments	135	165
Fair Value Measured on a Recurring Basis | Other derivatives
Assets:
Derivative Instruments	12	7
Liabilities:
Derivative Instruments	1	1
Fair Value Measured on a Recurring Basis | Level 1
Assets:
Total Assets	2,211	2,428
Liabilities:
Total Liabilities	0	0
Fair Value Measured on a Recurring Basis | Level 1 | Corporate debt
Assets:
Cash Equivalents	0	0
Fair Value Measured on a Recurring Basis | Level 1 | Government debt
Assets:
Cash Equivalents	2,207	2,422
Fair Value Measured on a Recurring Basis | Level 1 | Marketable equity securities and Mutual funds
Assets:
Available-for-Sale Investments	4	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	1,234	1,725
Liabilities:
Total Liabilities	144	166
Fair Value Measured on a Recurring Basis | Level 2 | Corporate debt
Assets:
Cash Equivalents	622	1,283
Fair Value Measured on a Recurring Basis | Level 2 | Government debt
Assets:
Cash Equivalents	0	0
Fair Value Measured on a Recurring Basis | Level 2 | Marketable equity securities and Mutual funds
Assets:
Available-for-Sale Investments	48	50
Fair Value Measured on a Recurring Basis | Level 2 | Interest rate contracts
Assets:
Derivative Instruments	14	4
Liabilities:
Derivative Instruments	8	0
Fair Value Measured on a Recurring Basis | Level 2 | Foreign currency contracts
Assets:
Derivative Instruments	538	381
Liabilities:
Derivative Instruments	135	165
Fair Value Measured on a Recurring Basis | Level 2 | Other derivatives
Assets:
Derivative Instruments	12	7
Liabilities:
Derivative Instruments	1	1
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
Fair Value Measured on a Recurring Basis | Level 3 | Government debt
Assets:
Cash Equivalents	0	0
Fair Value Measured on a Recurring Basis | Level 3 | Marketable equity securities and 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