Fair Value (Details) - USD ($) $ in Millions	Jan. 31, 2018	Oct. 31, 2017
Assets:
Cash Equivalents	$ 4,013	$ 5,398
Derivative Instruments	55	121
Liabilities:
Derivative Instruments	839	372
Fair value, short- and long-term debt	8,100	8,100
Carrying value, short- and long-term debt	7,900	7,800
Fair Value Measured on a Recurring Basis
Assets:
Total Assets	5,392	6,729
Liabilities:
Total Liabilities	839	372
Fair Value Measured on a Recurring Basis | Corporate debt
Assets:
Cash Equivalents	1,180	1,390
Available-for-Sale Investments	667	629
Fair Value Measured on a Recurring Basis | Financial institution instruments
Assets:
Cash Equivalents	0	6
Available-for-Sale Investments	77	78
Fair Value Measured on a Recurring Basis | Government debt
Assets:
Cash Equivalents	2,833	4,002
Available-for-Sale Investments	522	442
Fair Value Measured on a Recurring Basis | Mutual funds
Assets:
Available-for-Sale Investments	52	49
Fair Value Measured on a Recurring Basis | Marketable equity securities
Assets:
Available-for-Sale Investments	6	12
Fair Value Measured on a Recurring Basis | Interest rate contracts
Liabilities:
Derivative Instruments	52	12
Fair Value Measured on a Recurring Basis | Foreign currency contracts
Assets:
Derivative Instruments	51	120
Liabilities:
Derivative Instruments	787	360
Fair Value Measured on a Recurring Basis | Other derivatives
Assets:
Derivative Instruments	4	1
Fair Value Measured on a Recurring Basis | Level 1
Assets:
Total Assets	2,891	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	2,833	3,902
Available-for-Sale Investments	0	0
Fair Value Measured on a Recurring Basis | Level 1 | Mutual funds
Assets:
Available-for-Sale Investments	52	49
Fair Value Measured on a Recurring Basis | Level 1 | Marketable equity securities
Assets:
Available-for-Sale Investments	6	6
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 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 2
Assets:
Total Assets	2,501	2,762
Liabilities:
Total Liabilities	834	370
Fair Value Measured on a Recurring Basis | Level 2 | Corporate debt
Assets:
Cash Equivalents	1,180	1,390
Available-for-Sale Investments	667	629
Fair Value Measured on a Recurring Basis | Level 2 | Financial institution instruments
Assets:
Cash Equivalents	0	6
Available-for-Sale Investments	77	78
Fair Value Measured on a Recurring Basis | Level 2 | Government debt
Assets:
Cash Equivalents	0	100
Available-for-Sale Investments	522	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 | Interest rate contracts
Liabilities:
Derivative Instruments	52	12
Fair Value Measured on a Recurring Basis | Level 2 | Foreign currency contracts
Assets:
Derivative Instruments	51	110
Liabilities:
Derivative Instruments	782	358
Fair Value Measured on a Recurring Basis | Level 2 | Other derivatives
Assets:
Derivative Instruments	4	1
Fair Value Measured on a Recurring Basis | Level 3
Assets:
Total Assets	0	10
Liabilities:
Total Liabilities	5	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 | Interest rate contracts
Liabilities:
Derivative Instruments	0	0
Fair Value Measured on a Recurring Basis | Level 3 | Foreign currency contracts
Assets:
Derivative Instruments	0	10
Liabilities:
Derivative Instruments	5	2
Fair Value Measured on a Recurring Basis | Level 3 | Other derivatives
Assets:
Derivative Instruments	$ 0	$ 0