Fair Value (Details) - USD ($) $ in Millions	Jul. 31, 2018	Oct. 31, 2017
Assets:
Cash Equivalents	$ 5,035	$ 5,398
Derivative Instruments	323	121
Liabilities:
Derivative Instruments	215	372
Fair value, short- and long-term debt	7,300	8,100
Carrying value, short- and long-term debt	7,200	7,800
Corporate debt
Assets:
Cash Equivalents	1,493	1,390
Financial institution instruments
Assets:
Cash Equivalents	0	6
Government debt
Assets:
Cash Equivalents	3,542	4,002
Fair Value Measured on a Recurring Basis
Assets:
Total Assets	6,301	6,729
Liabilities:
Total Liabilities	215	372
Fair Value Measured on a Recurring Basis | Corporate debt
Assets:
Cash Equivalents	1,493	1,390
Available-for-Sale Investments	434	629
Fair Value Measured on a Recurring Basis | Financial institution instruments
Assets:
Cash Equivalents	0	6
Available-for-Sale Investments	39	78
Fair Value Measured on a Recurring Basis | Government debt
Assets:
Cash Equivalents	3,542	4,002
Available-for-Sale Investments	413	442
Fair Value Measured on a Recurring Basis | Mutual funds
Assets:
Available-for-Sale Investments	50	49
Fair Value Measured on a Recurring Basis | Marketable equity securities
Assets:
Available-for-Sale Investments	7	12
Fair Value Measured on a Recurring Basis | Foreign currency contracts
Assets:
Derivative Instruments	321	120
Liabilities:
Derivative Instruments	192	360
Fair Value Measured on a Recurring Basis | Other derivatives
Assets:
Derivative Instruments	2	1
Fair Value Measured on a Recurring Basis | Interest rate contracts
Liabilities:
Derivative Instruments	23	12
Fair Value Measured on a Recurring Basis | Level 1
Assets:
Total Assets	3,454	3,957
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	3,397	3,902
Available-for-Sale Investments	0	0
Fair Value Measured on a Recurring Basis | Level 1 | Mutual funds
Assets:
Available-for-Sale Investments	50	49
Fair Value Measured on a Recurring Basis | Level 1 | Marketable equity securities
Assets:
Available-for-Sale Investments	7	6
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
Fair Value Measured on a Recurring Basis | Level 1 | Interest rate contracts
Liabilities:
Derivative Instruments	0	0
Fair Value Measured on a Recurring Basis | Level 2
Assets:
Total Assets	2,840	2,762
Liabilities:
Total Liabilities	215	370
Fair Value Measured on a Recurring Basis | Level 2 | Corporate debt
Assets:
Cash Equivalents	1,493	1,390
Available-for-Sale Investments	434	629
Fair Value Measured on a Recurring Basis | Level 2 | Financial institution instruments
Assets:
Cash Equivalents	0	6
Available-for-Sale Investments	39	78
Fair Value Measured on a Recurring Basis | Level 2 | Government debt
Assets:
Cash Equivalents	145	100
Available-for-Sale Investments	413	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 | Foreign currency contracts
Assets:
Derivative Instruments	314	110
Liabilities:
Derivative Instruments	192	358
Fair Value Measured on a Recurring Basis | Level 2 | Other derivatives
Assets:
Derivative Instruments	2	1
Fair Value Measured on a Recurring Basis | Level 2 | Interest rate contracts
Liabilities:
Derivative Instruments	23	12
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:
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 | Marketable equity securities
Assets:
Available-for-Sale Investments	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
Fair Value Measured on a Recurring Basis | Level 3 | Interest rate contracts
Liabilities:
Derivative Instruments	$ 0	$ 0