Fair Value (Details) - USD ($) $ in Millions	Jul. 31, 2020	Oct. 31, 2019
Assets:
Cash Equivalents	$ 3,778	$ 3,705
Derivative Instruments	199	392
Liabilities:
Derivative Instruments	444	166
Fair value, short- and long-term debt	6,800	5,400
Carrying value, short- and long-term debt	6,300	5,100
Corporate debt
Assets:
Cash Equivalents	985	1,283
Financial Institution
Assets:
Cash Equivalents	13	0
Government debt
Assets:
Cash Equivalents	2,780	2,422
Fair Value Measured on a Recurring Basis
Assets:
Total Assets	4,263	4,153
Liabilities:
Total Liabilities	444	166
Fair Value Measured on a Recurring Basis | Corporate debt
Assets:
Cash Equivalents	985	1,283
Available-for-Sale Investments	135	0
Fair Value Measured on a Recurring Basis | Financial Institution
Assets:
Cash Equivalents	13	0
Available-for-Sale Investments	26	0
Fair Value Measured on a Recurring Basis | Government debt
Assets:
Cash Equivalents	2,780	2,422
Available-for-Sale Investments	68	0
Fair Value Measured on a Recurring Basis | Marketable equity securities and mutual funds
Assets:
Available-for-Sale Investments	57	56
Fair Value Measured on a Recurring Basis | Interest rate contracts
Assets:
Derivative Instruments	6	4
Fair Value Measured on a Recurring Basis | Foreign currency contracts
Assets:
Derivative Instruments	171	381
Liabilities:
Derivative Instruments	444	165
Fair Value Measured on a Recurring Basis | Other derivatives
Assets:
Derivative Instruments	22	7
Liabilities:
Derivative Instruments	0	1
Fair Value Measured on a Recurring Basis | Level 1
Assets:
Total Assets	2,506	2,428
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
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	2,502	2,422
Available-for-Sale Investments	0	0
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
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	1,757	1,725
Liabilities:
Total Liabilities	444	166
Fair Value Measured on a Recurring Basis | Level 2 | Corporate debt
Assets:
Cash Equivalents	985	1,283
Available-for-Sale Investments	135	0
Fair Value Measured on a Recurring Basis | Level 2 | Financial Institution
Assets:
Cash Equivalents	13	0
Available-for-Sale Investments	26	0
Fair Value Measured on a Recurring Basis | Level 2 | Government debt
Assets:
Cash Equivalents	278	0
Available-for-Sale Investments	68	0
Fair Value Measured on a Recurring Basis | Level 2 | Marketable equity securities and mutual funds
Assets:
Available-for-Sale Investments	53	50
Fair Value Measured on a Recurring Basis | Level 2 | Interest rate contracts
Assets:
Derivative Instruments	6	4
Fair Value Measured on a Recurring Basis | Level 2 | Foreign currency contracts
Assets:
Derivative Instruments	171	381
Liabilities:
Derivative Instruments	444	165
Fair Value Measured on a Recurring Basis | Level 2 | Other derivatives
Assets:
Derivative Instruments	22	7
Liabilities:
Derivative Instruments	0	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
Available-for-Sale Investments	0	0
Fair Value Measured on a Recurring Basis | Level 3 | Financial Institution
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 | 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
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