Fair Value (Details) - USD ($) $ in Millions	Jan. 31, 2017	Oct. 31, 2016
Fair Value and Carrying Value of Debt
Fair value, short-term and long-term debt	$ 16,000	$ 16,300
Carrying value, short-term and long-term debt	15,800	16,100
Fair Value, Measurements, Recurring
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	7,610	11,742
Total liabilities	397	228
Fair Value, Measurements, Recurring | Time deposits
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	3,662	4,085
Fair Value, Measurements, Recurring | Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	3,069	6,549
Fair Value, Measurements, Recurring | Equity securities in public companies
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	22	17
Fair Value, Measurements, Recurring | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	271	287
Fair Value, Measurements, Recurring | Other debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	35	35
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	159	6
Fair Value, Measurements, Recurring | Foreign exchange contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	550	660
Total liabilities	238	220
Fair Value, Measurements, Recurring | Other derivatives
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	1	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	3,099	6,574
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	3,069	6,549
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	22	17
Fair Value, Measurements, Recurring | Level 1 | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	8	8
Fair Value, Measurements, Recurring | Level 2
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	4,476	5,133
Total liabilities	397	228
Fair Value, Measurements, Recurring | Level 2 | Time deposits
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	3,662	4,085
Fair Value, Measurements, Recurring | Level 2 | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	263	279
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	159	6
Fair Value, Measurements, Recurring | Level 2 | Foreign exchange contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	550	660
Total liabilities	238	220
Fair Value, Measurements, Recurring | Level 2 | Other derivatives
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	1	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	35	35
Fair Value, Measurements, Recurring | Level 3 | Other debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	$ 35	$ 35