Fair Value (Details) - USD ($) $ in Millions	Oct. 31, 2018	Oct. 31, 2017
Fair Value and Carrying Value of Debt
Fair value, short- and long-term debt	$ 12,200	$ 14,600
Carrying value, short- and long-term debt	12,100	14,000
Fair Value, Measurements, Recurring | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	3,773	7,260
Total liabilities	476	477
Fair Value, Measurements, Recurring | Time deposits | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	781	1,159
Fair Value, Measurements, Recurring | Money market funds | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	2,340	5,592
Fair Value, Measurements, Recurring | Foreign bonds | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	131	223
Fair Value, Measurements, Recurring | Other debt securities | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	25	26
Fair Value, Measurements, Recurring | Foreign currency contracts | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	496	259
Total liabilities	117	335
Fair Value, Measurements, Recurring | Other derivatives | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	0	1
Total liabilities	6	0
Fair Value, Measurements, Recurring | Interest rate contracts | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total liabilities	353	142
Fair Value, Measurements, Recurring | Level 1
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	2,347	5,601
Fair Value, Measurements, Recurring | Level 1 | Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	2,340	5,592
Fair Value, Measurements, Recurring | Level 1 | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	7	9
Fair Value, Measurements, Recurring | Level 2
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	1,401	1,633
Total liabilities	476	477
Fair Value, Measurements, Recurring | Level 2 | Time deposits
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	781	1,159
Fair Value, Measurements, Recurring | Level 2 | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	124	214
Fair Value, Measurements, Recurring | Level 2 | Foreign currency contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	496	259
Total liabilities	117	335
Fair Value, Measurements, Recurring | Level 2 | Other derivatives
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	0	1
Total liabilities	6	0
Fair Value, Measurements, Recurring | Level 2 | Interest rate contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total liabilities	353	142
Fair Value, Measurements, Recurring | Level 3
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	25	26
Fair Value, Measurements, Recurring | Level 3 | Other debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Total assets	$ 25	$ 26