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Taxes on Earnings - Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Oct. 31, 2018	Oct. 31, 2017	Oct. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns
Balance at beginning of year	$ 10,808	$ 10,858	$ 6,546
Increases:
For current year’s tax positions	66	52	468
For prior years’ tax positions	101	85	4,004
Decreases:
For prior years’ tax positions	(248)	(181)	(62)
Statute of limitations expirations	(3)	(1)	0
Settlements with taxing authorities	(2,953)	(5)	(98)
Balance at end of year	$ 7,771	$ 10,808	$ 10,858

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