Financial Instruments - Fair Value of Derivative Instruments in the Consolidated Balance Sheets (Details) - USD ($) $ in Millions	Oct. 31, 2020	Oct. 31, 2019
Investment Holdings [Line Items]
Outstanding Gross Notional	$ 21,997	$ 23,669
Total Assets	195	392
Total Liabilities	262	166
Other Current Assets
Investment Holdings [Line Items]
Total Assets	165	277
Other Non-Current Assets
Investment Holdings [Line Items]
Total Assets	30	115
Other Current Liabilities
Investment Holdings [Line Items]
Total Liabilities	222	138
Other Non-Current Liabilities
Investment Holdings [Line Items]
Total Liabilities	40	28
Derivatives designated as hedging instruments
Investment Holdings [Line Items]
Outstanding Gross Notional	16,536	16,389
Derivatives designated as hedging instruments | Other Current Assets
Investment Holdings [Line Items]
Total Assets	152	260
Derivatives designated as hedging instruments | Other Non-Current Assets
Investment Holdings [Line Items]
Total Assets	30	115
Derivatives designated as hedging instruments | Other Current Liabilities
Investment Holdings [Line Items]
Total Liabilities	199	123
Derivatives designated as hedging instruments | Other Non-Current Liabilities
Investment Holdings [Line Items]
Total Liabilities	40	28
Derivatives designated as hedging instruments | Interest rate contracts | Fair value hedges
Investment Holdings [Line Items]
Outstanding Gross Notional	875	750
Derivatives designated as hedging instruments | Interest rate contracts | Other Current Assets | Fair value hedges
Investment Holdings [Line Items]
Total Assets	4	0
Derivatives designated as hedging instruments | Interest rate contracts | Other Non-Current Assets | Fair value hedges
Investment Holdings [Line Items]
Total Assets	0	4
Derivatives designated as hedging instruments | Interest rate contracts | Other Current Liabilities | Fair value hedges
Investment Holdings [Line Items]
Total Liabilities	0	0
Derivatives designated as hedging instruments | Interest rate contracts | Other Non-Current Liabilities | Fair value hedges
Investment Holdings [Line Items]
Total Liabilities	3	0
Derivatives designated as hedging instruments | Foreign currency contracts | Cash flow hedges
Investment Holdings [Line Items]
Outstanding Gross Notional	15,661	15,639
Derivatives designated as hedging instruments | Foreign currency contracts | Other Current Assets | Cash flow hedges
Investment Holdings [Line Items]
Total Assets	148	260
Derivatives designated as hedging instruments | Foreign currency contracts | Other Non-Current Assets | Cash flow hedges
Investment Holdings [Line Items]
Total Assets	30	111
Derivatives designated as hedging instruments | Foreign currency contracts | Other Current Liabilities | Cash flow hedges
Investment Holdings [Line Items]
Total Liabilities	199	123
Derivatives designated as hedging instruments | Foreign currency contracts | Other Non-Current Liabilities | Cash flow hedges
Investment Holdings [Line Items]
Total Liabilities	37	28
Derivatives not designated as hedging instruments
Investment Holdings [Line Items]
Outstanding Gross Notional	5,461	7,280
Derivatives not designated as hedging instruments | Other Current Assets
Investment Holdings [Line Items]
Total Assets	13	17
Derivatives not designated as hedging instruments | Other Non-Current Assets
Investment Holdings [Line Items]
Total Assets	0	0
Derivatives not designated as hedging instruments | Other Current Liabilities
Investment Holdings [Line Items]
Total Liabilities	23	15
Derivatives not designated as hedging instruments | Other Non-Current Liabilities
Investment Holdings [Line Items]
Total Liabilities	0	0
Derivatives not designated as hedging instruments | Foreign currency contracts
Investment Holdings [Line Items]
Outstanding Gross Notional	5,319	7,146
Derivatives not designated as hedging instruments | Foreign currency contracts | Other Current Assets
Investment Holdings [Line Items]
Total Assets	13	10
Derivatives not designated as hedging instruments | Foreign currency contracts | Other Non-Current Assets
Investment Holdings [Line Items]
Total Assets	0	0
Derivatives not designated as hedging instruments | Foreign currency contracts | Other Current Liabilities
Investment Holdings [Line Items]
Total Liabilities	20	14
Derivatives not designated as hedging instruments | Foreign currency contracts | Other Non-Current Liabilities
Investment Holdings [Line Items]
Total Liabilities	0	0
Derivatives not designated as hedging instruments | Other derivatives
Investment Holdings [Line Items]
Outstanding Gross Notional	142	134
Derivatives not designated as hedging instruments | Other derivatives | Other Current Assets
Investment Holdings [Line Items]
Total Assets	0	7
Derivatives not designated as hedging instruments | Other derivatives | Other Non-Current Assets
Investment Holdings [Line Items]
Total Assets	0	0
Derivatives not designated as hedging instruments | Other derivatives | Other Current Liabilities
Investment Holdings [Line Items]
Total Liabilities	3	1
Derivatives not designated as hedging instruments | Other derivatives | Other Non-Current Liabilities
Investment Holdings [Line Items]
Total Liabilities	$ 0	$ 0