Fair Value (Details) - USD ($) $ in Millions	Jul. 31, 2016	Oct. 31, 2015
Assets:
Cash Equivalents	$ 4,442	$ 5,414
Derivative Instruments	351	258
Liabilities:
Derivative Instruments	160	304
Fair value, short- and long-term debt	7,100	8,900
Carrying value, short- and long-term debt	6,800	8,900
Fair Value Measured on a Recurring Basis
Assets:
Total Assets	4,851	5,725
Liabilities:
Total Liabilities	160	304
Fair Value Measured on a Recurring Basis | Time deposits
Assets:
Cash Equivalents	1,915	1,111
Fair Value Measured on a Recurring Basis | Money market funds
Assets:
Cash Equivalents	2,527	4,303
Fair Value Measured on a Recurring Basis | Marketable equity securities
Assets:
Investments	9	9
Fair Value Measured on a Recurring Basis | Foreign bonds
Assets:
Investments	47	42
Fair Value Measured on a Recurring Basis | Other debt securities
Assets:
Investments	2	2
Fair Value Measured on a Recurring Basis | Interest rate contracts
Assets:
Derivative Instruments	76	38
Fair Value Measured on a Recurring Basis | Foreign currency contracts
Assets:
Derivative Instruments	270	215
Liabilities:
Derivative Instruments	160	304
Fair Value Measured on a Recurring Basis | Other derivatives
Assets:
Derivative Instruments	5	5
Fair Value Measured on a Recurring Basis | Level 1
Assets:
Total Assets	2,532	4,309
Liabilities:
Total Liabilities	0	0
Fair Value Measured on a Recurring Basis | Level 1 | Time deposits
Assets:
Cash Equivalents	0	0
Fair Value Measured on a Recurring Basis | Level 1 | Money market funds
Assets:
Cash Equivalents	2,527	4,303
Fair Value Measured on a Recurring Basis | Level 1 | Marketable equity securities
Assets:
Investments	5	6
Fair Value Measured on a Recurring Basis | Level 1 | Foreign bonds
Assets:
Investments	0	0
Fair Value Measured on a Recurring Basis | Level 1 | Other debt securities
Assets:
Investments	0	0
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
Fair Value Measured on a Recurring Basis | Level 2
Assets:
Total Assets	2,318	1,414
Liabilities:
Total Liabilities	150	302
Fair Value Measured on a Recurring Basis | Level 2 | Time deposits
Assets:
Cash Equivalents	1,915	1,111
Fair Value Measured on a Recurring Basis | Level 2 | Money market funds
Assets:
Cash Equivalents	0	0
Fair Value Measured on a Recurring Basis | Level 2 | Marketable equity securities
Assets:
Investments	4	3
Fair Value Measured on a Recurring Basis | Level 2 | Foreign bonds
Assets:
Investments	47	42
Fair Value Measured on a Recurring Basis | Level 2 | Other debt securities
Assets:
Investments	2	2
Fair Value Measured on a Recurring Basis | Level 2 | Interest rate contracts
Assets:
Derivative Instruments	76	38
Fair Value Measured on a Recurring Basis | Level 2 | Foreign currency contracts
Assets:
Derivative Instruments	269	213
Liabilities:
Derivative Instruments	150	302
Fair Value Measured on a Recurring Basis | Level 2 | Other derivatives
Assets:
Derivative Instruments	5	5
Fair Value Measured on a Recurring Basis | Level 3
Assets:
Total Assets	1	2
Liabilities:
Total Liabilities	10	2
Fair Value Measured on a Recurring Basis | Level 3 | Time deposits
Assets:
Cash Equivalents	0	0
Fair Value Measured on a Recurring Basis | Level 3 | Money market funds
Assets:
Cash Equivalents	0	0
Fair Value Measured on a Recurring Basis | Level 3 | Marketable equity securities
Assets:
Investments	0	0
Fair Value Measured on a Recurring Basis | Level 3 | Foreign bonds
Assets:
Investments	0	0
Fair Value Measured on a Recurring Basis | Level 3 | Other debt securities
Assets:
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	1	2
Liabilities:
Derivative Instruments	10	2
Fair Value Measured on a Recurring Basis | Level 3 | Other derivatives
Assets:
Derivative Instruments	$ 0	$ 0