Fair Value (Details) - USD ($) $ in Millions	Apr. 30, 2017	Oct. 31, 2016
Fair Value and Carrying Value of Debt
Fair value, short-term and long-term debt	$ 14,000	$ 15,800
Carrying value, short-term and long-term debt	13,900	15,700
Fair Value, Measurements, Recurring
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	5,996	11,474
Total liabilities	387	219
Fair Value, Measurements, Recurring | Time deposits
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	2,446	4,035
Fair Value, Measurements, Recurring | Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	2,845	6,495
Fair Value, Measurements, Recurring | Equity securities in public companies
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	21	16
Fair Value, Measurements, Recurring | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	222	180
Fair Value, Measurements, Recurring | Other debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	27	28
Fair Value, Measurements, Recurring | Interest rate contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	0	109
Total liabilities	122	6
Fair Value, Measurements, Recurring | Foreign exchange contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	433	611
Total liabilities	265	211
Fair Value, Measurements, Recurring | Other derivatives
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	2	0
Total liabilities	0	2
Fair Value, Measurements, Recurring | Level 1
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	2,874	6,511
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	2,845	6,495
Fair Value, Measurements, Recurring | Level 1 | Equity securities in public companies
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	21	16
Fair Value, Measurements, Recurring | Level 1 | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	8	0
Fair Value, Measurements, Recurring | Level 2
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	3,095	4,935
Total liabilities	387	219
Fair Value, Measurements, Recurring | Level 2 | Time deposits
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	2,446	4,035
Fair Value, Measurements, Recurring | Level 2 | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	214	180
Fair Value, Measurements, Recurring | Level 2 | Interest rate contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	0	109
Total liabilities	122	6
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	433	611
Total liabilities	265	211
Fair Value, Measurements, Recurring | Level 2 | Other derivatives
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	2	0
Total liabilities	0	2
Fair Value, Measurements, Recurring | Level 3
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	27	28
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Other debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	27	28
Fair Value, Measurements, Recurring | Level 3 | Interest rate contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Foreign exchange contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total liabilities	0	0
Fair Value, Measurements, Recurring | Level 3 | Other derivatives
Financial assets and liabilities measured at fair value on a recurring basis
Total liabilities	$ 0	$ 0