Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments in Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions	3 Months Ended
	Jan. 31, 2022	Jan. 31, 2021
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain recognized in Accumulated other comprehensive loss on derivative	$ 299	$ (366)
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded	1,359	1,321
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings	44	(49)
Cash flow hedges
Pre-tax effect of derivative instruments in cash flow hedging relationships
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings	44	(49)
Cash flow hedges | Net revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded	17,028	15,646
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings	57	(43)
Cash flow hedges | Cost of revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded	(13,643)	(12,322)
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings	(14)	(6)
Cash flow hedges | Other operating expenses
Pre-tax effect of derivative instruments in cash flow hedging relationships
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded	(2,026)	(2,003)
Gain/(loss) reclassified from Accumulated  other comprehensive loss into earnings	1	0
Foreign currency contracts | Cash flow hedges
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain recognized in Accumulated other comprehensive loss on derivative	280	(366)
Interest rate contracts | Cash flow hedges
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain recognized in Accumulated other comprehensive loss on derivative	$ 19	$ 0