The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

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Amount, before tax and reclassification, of gain (loss) from derivative instrument designated and qualifying cash flow hedge included in assessment of hedge effectiveness.

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Amount, before tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness.

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Amount before tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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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
	Apr. 30, 2020	Apr. 30, 2019	Apr. 30, 2020	Apr. 30, 2019
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain/(Loss) Recognized in AOCI on Derivatives	$ 231		$ 291
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded	826	$ 928	1,691	$ 1,854
Gain /(Loss) Reclassified from AOCI Into Earnings	53		112
Gain/(Loss) Recognized in AOCI on Derivatives		198		91
Cash flow hedges
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain/(Loss) Recognized in AOCI on Derivatives			291
Gain /(Loss) Reclassified from AOCI Into Earnings			112
Gain/(Loss) Recognized in AOCI on Derivatives		198		91
Gain /(Loss) Reclassified from AOCI Into Earnings		(6)		173
Foreign currency contracts
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain/(Loss) Recognized in AOCI on Derivatives	239
Foreign currency contracts \| Net revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain /(Loss) Reclassified from AOCI Into Earnings	62
Foreign currency contracts \| Cash flow hedges
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain/(Loss) Recognized in AOCI on Derivatives			299
Gain/(Loss) Recognized in AOCI on Derivatives		198		91
Foreign currency contracts \| Cash flow hedges \| Net revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded	12,469	14,036	27,087	28,746
Gain /(Loss) Reclassified from AOCI Into Earnings			123
Gain /(Loss) Reclassified from AOCI Into Earnings		0		191
Foreign currency contracts \| Cash flow hedges \| Cost of revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded		(11,307)		(23,405)
Gain /(Loss) Reclassified from AOCI Into Earnings		(6)		(16)
Foreign currency contracts \| Cash flow hedges \| Operating expenses
Pre-tax effect of derivative instruments in cash flow hedging relationships
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded		(1,801)		(3,487)
Gain /(Loss) Reclassified from AOCI Into Earnings		$ 0		$ (2)
Interest rate contracts
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain/(Loss) Recognized in AOCI on Derivatives	(8)
Interest rate contracts \| Cost of revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain /(Loss) Reclassified from AOCI Into Earnings	(10)
Interest rate contracts \| Operating expenses
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain /(Loss) Reclassified from AOCI Into Earnings	1
Interest rate contracts \| Cash flow hedges
Pre-tax effect of derivative instruments in cash flow hedging relationships
Gain/(Loss) Recognized in AOCI on Derivatives			(8)
Interest rate contracts \| Cash flow hedges \| Cost of revenue
Pre-tax effect of derivative instruments in cash flow hedging relationships
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded	(9,976)		(21,722)
Gain /(Loss) Reclassified from AOCI Into Earnings			(11)
Interest rate contracts \| Cash flow hedges \| Operating expenses
Pre-tax effect of derivative instruments in cash flow hedging relationships
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of cash flow hedges are recorded	$ (1,667)		(3,674)
Gain /(Loss) Reclassified from AOCI Into Earnings			$ 0