Financial Instruments - Gross Notional and Fair Value of Instruments in the Balance Sheets (Details) - USD ($) $ in Millions	Jul. 31, 2020	Oct. 31, 2019
Derivatives, Fair Value
Outstanding Gross Notional	$ 23,171	$ 24,189
Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	182	215
Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	384	253
Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	258	107
Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	54	40
Derivatives designated as hedging instruments
Derivatives, Fair Value
Outstanding Gross Notional	17,057	17,694
Derivatives designated as hedging instruments | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	94	195
Derivatives designated as hedging instruments | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	377	250
Derivatives designated as hedging instruments | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	193	74
Derivatives designated as hedging instruments | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	53	37
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	4	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	255	72
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	0	11
Derivatives designated as hedging instruments | Fair value hedges | Interest rate contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	0	0
Derivatives designated as hedging instruments | Cash flow hedges | Interest rate contracts
Derivatives, Fair Value
Outstanding Gross Notional	500	500
Derivatives designated as hedging instruments | Cash flow hedges | Interest rate contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	0	0
Derivatives designated as hedging instruments | Cash flow hedges | Interest rate contracts | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	0	1
Derivatives designated as hedging instruments | Cash flow hedges | Interest rate contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	4	0
Derivatives designated as hedging instruments | Cash flow hedges | Interest rate contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	0	0
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts
Derivatives, Fair Value
Outstanding Gross Notional	7,929	8,578
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	61	164
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	85	141
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	176	45
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	47	27
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts
Derivatives, Fair Value
Outstanding Gross Notional	1,778	1,766
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	29	31
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	37	36
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	13	18
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	6	10
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Outstanding Gross Notional	6,114	6,495
Derivatives not designated as hedging instruments | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	88	20
Derivatives not designated as hedging instruments | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	7	3
Derivatives not designated as hedging instruments | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	65	33
Derivatives not designated as hedging instruments | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	1	3
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivatives, Fair Value
Outstanding Gross Notional	6,013	6,398
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	86	17
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	7	3
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	65	33
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	1	3
Derivatives not designated as hedging instruments | Other derivatives
Derivatives, Fair Value
Outstanding Gross Notional	101	97
Derivatives not designated as hedging instruments | Other derivatives | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	2	3
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	0	0
Derivatives not designated as hedging instruments | Other derivatives | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	$ 0	$ 0