Financial Instruments - Gross Notional and Fair Value of Instruments in the Balance Sheets (Details) - USD ($) $ in Millions	Jul. 31, 2019	Oct. 31, 2018
Derivatives, Fair Value
Outstanding Gross Notional	$ 22,443	$ 23,894
Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	279	343
Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	208	153
Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	69	85
Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	80	391
Derivatives designated as hedging instruments
Derivatives, Fair Value
Outstanding Gross Notional	17,134	17,010
Derivatives designated as hedging instruments | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	243	302
Derivatives designated as hedging instruments | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	207	148
Derivatives designated as hedging instruments | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	42	24
Derivatives designated as hedging instruments | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	73	379
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts
Derivatives, Fair Value
Outstanding Gross Notional	6,850	6,850
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	0	0
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	20	0
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	0	0
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	32	353
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts
Derivatives, Fair Value
Outstanding Gross Notional	8,539	8,423
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	218	270
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	157	107
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	24	11
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	23	15
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts
Derivatives, Fair Value
Outstanding Gross Notional	1,745	1,737
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	25	32
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	30	41
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	18	13
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	18	11
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Outstanding Gross Notional	5,309	6,884
Derivatives not designated as hedging instruments | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	36	41
Derivatives not designated as hedging instruments | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	1	5
Derivatives not designated as hedging instruments | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	27	61
Derivatives not designated as hedging instruments | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	7	12
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivatives, Fair Value
Outstanding Gross Notional	5,206	6,780
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	36	41
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	1	5
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	26	55
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	7	12
Derivatives not designated as hedging instruments | Other derivatives
Derivatives, Fair Value
Outstanding Gross Notional	103	104
Derivatives not designated as hedging instruments | Other derivatives | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	0	0
Derivatives not designated as hedging instruments | Other derivatives | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	0	0
Derivatives not designated as hedging instruments | Other derivatives | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	1	6
Derivatives not designated as hedging instruments | Other derivatives | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	$ 0	$ 0