Fair Value (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Jul. 31, 2015	Jul. 31, 2015	Oct. 31, 2014
Fair Value and Carrying Value of Debt
Fair value, short- and long-term debt	$ 25,700	$ 25,700	$ 19,900
Carrying value, short- and long-term debt	25,500	25,500	19,500
Impairment of data center assets	136	136
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	9,997	9,997	9,880
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	9,926	9,926	9,857
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	62	62	14
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 1 | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	9	9	9
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	5,123	5,123	4,456
Total Liabilities, measured at fair value on a recurring basis	489	489	403
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	3,196	3,196	2,865
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 2 | Mutual funds
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	289	289	244
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	9	9	5
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	321	321	367
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	1	1
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	88	88	105
Total Liabilities, measured at fair value on a recurring basis	3	3	55
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	1,215	1,215	862
Total Liabilities, measured at fair value on a recurring basis	485	485	348
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	4	4	7
Total Liabilities, measured at fair value on a recurring basis	1	1
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	48	48	52
Total Liabilities, measured at fair value on a recurring basis	2	2	2
Fair Value, Measurements, Recurring | Fair Value Measured Using Level 3 | 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	41	41	46
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	7	7	6
Total Liabilities, measured at fair value on a recurring basis	2	2	2
Fair Value, Measurements, Recurring | Fair Value
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	15,168	15,168	14,388
Total Liabilities, measured at fair value on a recurring basis	491	491	405
Transfer of marketable equity securities from Level 2 to Level 1	41	41
Fair Value, Measurements, Recurring | Fair Value | Time deposits
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	3,196	3,196	2,865
Fair Value, Measurements, Recurring | Fair Value | 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	9,926	9,926	9,857
Fair Value, Measurements, Recurring | Fair Value | Mutual funds
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	289	289	244
Fair Value, Measurements, Recurring | Fair Value | 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	71	71	19
Fair Value, Measurements, Recurring | Fair Value | Foreign bonds
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	330	330	376
Fair Value, Measurements, Recurring | Fair Value | 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	42	42	47
Fair Value, Measurements, Recurring | Fair Value | 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	88	88	105
Total Liabilities, measured at fair value on a recurring basis	3	3	55
Fair Value, Measurements, Recurring | Fair Value | 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	1,222	1,222	868
Total Liabilities, measured at fair value on a recurring basis	487	487	350
Fair Value, Measurements, Recurring | Fair Value | Other derivatives
Financial assets and liabilities measured at fair value on a recurring basis
Total Assets, measured at fair value on a recurring basis	4	4	$ 7
Total Liabilities, measured at fair value on a recurring basis	$ 1	$ 1