Financial Instruments - Gross Notional and Fair Value of Instruments in the Balance Sheets (Details) - USD ($) $ in Millions	Apr. 30, 2020	Oct. 31, 2019
Derivatives, Fair Value
Outstanding Gross Notional	$ 23,084	$ 24,189
Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	361	215
Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	535	253
Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	85	107
Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	6	40
Derivatives designated as hedging instruments
Derivatives, Fair Value
Outstanding Gross Notional	17,157	17,694
Derivatives designated as hedging instruments | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	307	195
Derivatives designated as hedging instruments | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	520	250
Derivatives designated as hedging instruments | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	28	74
Derivatives designated as hedging instruments | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	4	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	6	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	240	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	5	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	8,050	8,578
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	241	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	205	141
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	21	45
Derivatives designated as hedging instruments | Cash flow hedges | Foreign exchange contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	3	27
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts
Derivatives, Fair Value
Outstanding Gross Notional	1,757	1,766
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	60	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	75	36
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	2	18
Derivatives designated as hedging instruments | Net investment hedges | Foreign exchange contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	1	10
Derivatives not designated as hedging instruments
Derivatives, Fair Value
Outstanding Gross Notional	5,927	6,495
Derivatives not designated as hedging instruments | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	54	20
Derivatives not designated as hedging instruments | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	15	3
Derivatives not designated as hedging instruments | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	57	33
Derivatives not designated as hedging instruments | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	2	3
Derivatives not designated as hedging instruments | Foreign exchange contracts
Derivatives, Fair Value
Outstanding Gross Notional	5,836	6,398
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	45	17
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-Term Financing Receivables and Other Assets
Derivatives, Fair Value
Derivative asset, fair value	15	3
Derivatives not designated as hedging instruments | Foreign exchange contracts | Other Accrued Liabilities
Derivatives, Fair Value
Derivative liability, fair value	56	33
Derivatives not designated as hedging instruments | Foreign exchange contracts | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	2	3
Derivatives not designated as hedging instruments | Other derivatives
Derivatives, Fair Value
Outstanding Gross Notional	91	97
Derivatives not designated as hedging instruments | Other derivatives | Other Current Assets
Derivatives, Fair Value
Derivative asset, fair value	9	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	1	0
Derivatives not designated as hedging instruments | Other derivatives | Long-Term Other Liabilities
Derivatives, Fair Value
Derivative liability, fair value	$ 0	$ 0