Financial Instruments - Hedges (Details) - USD ($) $ in Millions	9 Months Ended
	Jul. 31, 2016	Oct. 31, 2015
Derivatives, Fair Value
Period within which the funds held as collateral and posted as collateral are transferred from or to counterparties	2 days
Collateralized arrangements in net liability position	$ 20	$ 35
Outstanding Gross Notional	30,852	29,463
Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	412	459
Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	419	360
Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	247	85
Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	$ 56	107
Cash flow hedges: | Minimum
Derivatives, Fair Value
Duration of lease term for which lease-related forward contracts and intercompany lease loan forward contracts can be extended	2 years
Cash flow hedges: | Maximum
Derivatives, Fair Value
Duration of lease term for which lease-related forward contracts and intercompany lease loan forward contracts can be extended	5 years
Derivatives designated as hedging instruments
Derivatives, Fair Value
Outstanding Gross Notional	$ 20,127	20,053
Derivatives designated as hedging instruments | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	309	410
Derivatives designated as hedging instruments | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	417	272
Derivatives designated as hedging instruments | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	129	35
Derivatives designated as hedging instruments | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	53	67
Derivatives designated as hedging instruments | Fair value hedges: | Interest rate contracts
Derivatives, Fair Value
Outstanding Gross Notional	9,500	9,500
Derivatives designated as hedging instruments | Fair value hedges: | Interest rate contracts | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	239
Derivatives designated as hedging instruments | Fair value hedges: | Interest rate contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value		55
Derivatives designated as hedging instruments | Cash flow hedges: | Foreign currency contracts
Derivatives, Fair Value
Outstanding Gross Notional	8,778	8,692
Derivatives designated as hedging instruments | Cash flow hedges: | Foreign currency contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	263	296
Derivatives designated as hedging instruments | Cash flow hedges: | Foreign currency contracts | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	147	206
Derivatives designated as hedging instruments | Cash flow hedges: | Foreign currency contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	101	28
Derivatives designated as hedging instruments | Cash flow hedges: | Foreign currency contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	27	8
Derivatives designated as hedging instruments | Net investment hedges: | Foreign currency contracts
Derivatives, Fair Value
Outstanding Gross Notional	1,849	1,861
Derivatives designated as hedging instruments | Net investment hedges: | Foreign currency contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	46	114
Derivatives designated as hedging instruments | Net investment hedges: | Foreign currency contracts | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	31	66
Derivatives designated as hedging instruments | Net investment hedges: | Foreign currency contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	28	7
Derivatives designated as hedging instruments | Net investment hedges: | Foreign currency contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	26	4
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Outstanding Gross Notional	10,725	9,410
Derivatives not designated as hedging instruments | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	103	49
Derivatives not designated as hedging instruments | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	2	88
Derivatives not designated as hedging instruments | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	118	50
Derivatives not designated as hedging instruments | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	3	40
Derivatives not designated as hedging instruments | Foreign currency contracts
Derivatives, Fair Value
Outstanding Gross Notional	10,570	9,283
Derivatives not designated as hedging instruments | Foreign currency contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	98	46
Derivatives not designated as hedging instruments | Foreign currency contracts | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	2	88
Derivatives not designated as hedging instruments | Foreign currency contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	118	50
Derivatives not designated as hedging instruments | Foreign currency contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	3	40
Derivatives not designated as hedging instruments | Other derivatives
Derivatives, Fair Value
Outstanding Gross Notional	155	127
Derivatives not designated as hedging instruments | Other derivatives | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	5	$ 3
MphasiS | Derivatives designated as hedging instruments | Foreign currency contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	9
MphasiS | Derivatives designated as hedging instruments | Foreign currency contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	$ 2