Fair Value (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2016	Oct. 31, 2015
Financial assets and liabilities measured at fair value on a recurring basis
Transfers between the levels within the fair value hierarchy	$ 0
Fair Value and Carrying Value of Debt
Fair value, short- and long-term debt	6,500	$ 8,900
Carrying value, short- and long-term debt	6,700	8,900
Fair Value, Measurements, Recurring
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	2,753	5,725
Total Liabilities, measured at fair value on a recurring basis	245	304
Fair Value, Measurements, Recurring | Time deposits
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	1,055	1,111
Fair Value, Measurements, Recurring | Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	1,367	4,303
Fair Value, Measurements, Recurring | Marketable equity securities
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	8	9
Fair Value, Measurements, Recurring | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	44	42
Fair Value, Measurements, Recurring | Other debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	1	2
Fair Value, Measurements, Recurring | Interest rate contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	52	38
Fair Value, Measurements, Recurring | Foreign currency contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	226	215
Total Liabilities, measured at fair value on a recurring basis	241	304
Fair Value, Measurements, Recurring | Other derivatives
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis		5
Total Liabilities, measured at fair value on a recurring basis	4
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 1
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	1,372	4,309
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 1 | Money market funds
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	1,367	4,303
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 1 | Marketable equity securities
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	5	6
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	1,379	1,414
Total Liabilities, measured at fair value on a recurring basis	244	302
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Time deposits
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	1,055	1,111
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Marketable equity securities
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	3	3
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	44	42
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Other debt securities
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	1	2
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Interest rate contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	52	38
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Foreign currency contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	224	213
Total Liabilities, measured at fair value on a recurring basis	240	302
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Other derivatives
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis		5
Total Liabilities, measured at fair value on a recurring basis	4
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 3
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	2	2
Total Liabilities, measured at fair value on a recurring basis	1	2
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 3 | Foreign currency contracts
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	2	2
Total Liabilities, measured at fair value on a recurring basis	$ 1	$ 2