Financial Instruments - Schedule of Pre-Tax Effect of Derivative Instruments in Cash Flow Hedging Relationships (Details) - USD ($) $ in Millions	3 Months Ended						6 Months Ended		9 Months Ended
	Jul. 31, 2023	Apr. 30, 2023	Jan. 31, 2023	Jul. 31, 2022	Apr. 30, 2022	Jan. 31, 2022	Apr. 30, 2023	Apr. 30, 2022	Jul. 31, 2023	Jul. 31, 2022
Pre-tax effect of derivative instruments in cash flow hedging relationships
(Loss)/gain recognized in Accumulated other comprehensive (loss) income on derivatives	$ (68)			$ 280					$ (757)	$ 1,182
Total amounts of income/(expense) line items in the statement of financial performance in which the effects of cash flow hedges are recorded	952	$ 747	$ 743	1,256	$ 1,257	$ 1,305	$ 1,490	$ 2,562	2,442	3,818
Gain/(loss) reclassified from Accumulated  other comprehensive (loss) income into earnings	(68)			327					104	491
Cash flow hedges
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain/(loss) reclassified from Accumulated  other comprehensive (loss) income into earnings	(68)			327					104	491
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	13,196			14,648					39,901	48,136
Gain/(loss) reclassified from Accumulated  other comprehensive (loss) income into earnings	(37)			349					240	548
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	(10,374)			(11,764)					(31,378)	(38,564)
Gain/(loss) reclassified from Accumulated  other comprehensive (loss) income into earnings	(33)			(23)					(142)	(58)
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	(1,870)			(1,628)					(6,081)	(5,754)
Gain/(loss) reclassified from Accumulated  other comprehensive (loss) income into earnings	(1)			(1)					(3)	0
Cash flow hedges | Interest and other, net
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	(16)			(70)					(357)	(141)
Gain/(loss) reclassified from Accumulated  other comprehensive (loss) income into earnings	3			2					9	1
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) income on derivatives	(68)			264					(757)	1,097
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) income on derivatives	$ 0			$ 16					$ 0	$ 85