Fair Value (Details) - USD ($) $ in Millions	Jan. 31, 2020	Oct. 31, 2019
Assets:
Cash Equivalents	$ 3,163	$ 3,705
Derivative Instruments	391	392
Liabilities:
Derivative Instruments	151	166
Fair value, short- and long-term debt	5,100	5,400
Carrying value, short- and long-term debt	4,900	5,100
Corporate debt
Assets:
Cash Equivalents	1,001	1,283
Government debt
Assets:
Cash Equivalents	2,162	2,422
Fair Value Measured on a Recurring Basis
Assets:
Total Assets	3,902	4,153
Liabilities:
Total Liabilities	151	166
Fair Value Measured on a Recurring Basis | Corporate debt
Assets:
Cash Equivalents	1,001	1,283
Available-for-Sale Investments	242	0
Fair Value Measured on a Recurring Basis | Government debt
Assets:
Cash Equivalents	2,162	2,422
Available-for-Sale Investments	15	0
Fair Value Measured on a Recurring Basis | Financial institution instruments
Assets:
Available-for-Sale Investments	31	0
Fair Value Measured on a Recurring Basis | Marketable equity securities and Mutual funds
Assets:
Available-for-Sale Investments	60	56
Fair Value Measured on a Recurring Basis | Interest rate contracts
Assets:
Derivative Instruments	4	4
Fair Value Measured on a Recurring Basis | Foreign currency contracts
Assets:
Derivative Instruments	374	381
Liabilities:
Derivative Instruments	149	165
Fair Value Measured on a Recurring Basis | Other derivatives
Assets:
Derivative Instruments	13	7
Liabilities:
Derivative Instruments	2	1
Fair Value Measured on a Recurring Basis | Level 1
Assets:
Total Assets	2,060	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 | Government debt
Assets:
Cash Equivalents	2,050	2,422
Available-for-Sale Investments	0	0
Fair Value Measured on a Recurring Basis | Level 1 | Financial institution instruments
Assets:
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	10	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	1,842	1,725
Liabilities:
Total Liabilities	151	166
Fair Value Measured on a Recurring Basis | Level 2 | Corporate debt
Assets:
Cash Equivalents	1,001	1,283
Available-for-Sale Investments	242	0
Fair Value Measured on a Recurring Basis | Level 2 | Government debt
Assets:
Cash Equivalents	112	0
Available-for-Sale Investments	15	0
Fair Value Measured on a Recurring Basis | Level 2 | Financial institution instruments
Assets:
Available-for-Sale Investments	31	0
Fair Value Measured on a Recurring Basis | Level 2 | Marketable equity securities and Mutual funds
Assets:
Available-for-Sale Investments	50	50
Fair Value Measured on a Recurring Basis | Level 2 | Interest rate contracts
Assets:
Derivative Instruments	4	4
Fair Value Measured on a Recurring Basis | Level 2 | Foreign currency contracts
Assets:
Derivative Instruments	374	381
Liabilities:
Derivative Instruments	149	165
Fair Value Measured on a Recurring Basis | Level 2 | Other derivatives
Assets:
Derivative Instruments	13	7
Liabilities:
Derivative Instruments	2	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 | Government 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:
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