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Financial Instruments (Detail 5) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
Financial Instruments (Detail 5) - USD ($) $ in Millions	Oct. 31, 2019	Jul. 31, 2019	Apr. 30, 2019	Jan. 31, 2019	Oct. 31, 2018	Jul. 31, 2018	Apr. 30, 2018	Jan. 31, 2018	Oct. 31, 2019	Oct. 31, 2018	Oct. 31, 2017
Pre-tax effect of derivative instruments in cash flow and net investment hedging relationships
Gains (Losses) Recognized in OCI on Derivatives (Effective Portion)									$ 308	$ 169	$ 46
Net revenue	$ 7,215	$ 7,217	$ 7,150	$ 7,553	$ 7,946	$ 7,764	$ 7,468	$ 7,674	29,135	30,852	28,871
Cost of products									(27,861)	(29,115)	(28,307)
Interest and other, net									(177)	(274)	(327)
Earnings from continuing operations before taxes									1,553	268	272
Net loss from discontinued operations									0	(104)	(92)
Net earnings (loss)									1,049	1,908	344
Pre-tax effect of derivative instruments not designated as hedging instruments on the Consolidated Condensed Statements of Earnings
Gains (Losses) Recognized in Income on Derivatives									(126)	295	(440)
Interest rate contracts
Pre-tax effect of derivative instruments and related hedged items in a fair value hedging relationship
(Losses) Gains Recognized in Income on Derivative									414	(211)	(245)
(Losses) Gains recognized in Income on Related Hedged Item									(414)	211	245
Foreign currency contracts
Pre-tax effect of derivative instruments not designated as hedging instruments on the Consolidated Condensed Statements of Earnings
Gains (Losses) Recognized in Income on Derivatives									(134)	301	(443)
Other derivatives
Pre-tax effect of derivative instruments not designated as hedging instruments on the Consolidated Condensed Statements of Earnings
Gains (Losses) Recognized in Income on Derivatives									8	(6)	3
Cash flow hedges
Pre-tax effect of derivative instruments in cash flow and net investment hedging relationships
Gains (Losses) Recognized in OCI on Derivatives (Effective Portion)									308	169	46
Loss expected to be reclassified from Accumulated OCI into earnings in next 12 months									40
Cash flow hedges \| Gains (Losses) Reclassified from Accumulated OCI Into Earnings (Effective Portion) \| Reclassifications of losses (gains) into earnings
Pre-tax effect of derivative instruments in cash flow and net investment hedging relationships
Earnings from continuing operations before taxes									371	(8)	102
Net loss from discontinued operations									0	0	43
Net earnings (loss)									371	(8)	145
Cash flow hedges \| Continuing Operations
Pre-tax effect of derivative instruments in cash flow and net investment hedging relationships
Gains (Losses) Recognized in OCI on Derivatives (Effective Portion)									308	169	45
Cash flow hedges \| Interest rate contracts \| Gains (Losses) Reclassified from Accumulated OCI Into Earnings (Effective Portion) \| Reclassifications of losses (gains) into earnings
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Interest and other, net									0	0	0
Cash flow hedges \| Interest rate contracts \| Interest and other, net
Pre-tax effect of derivative instruments in cash flow and net investment hedging relationships
Gains (Losses) Recognized in OCI on Derivatives (Effective Portion)									1	0	0
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Pre-tax effect of derivative instruments in cash flow and net investment hedging relationships
Net revenue									233	(24)	(68)
Cost of products									0	0	0
Interest and other, net									138	16	170
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Pre-tax effect of derivative instruments in cash flow and net investment hedging relationships
Gains (Losses) Recognized in OCI on Derivatives (Effective Portion)									109	163	(113)
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Pre-tax effect of derivative instruments in cash flow and net investment hedging relationships
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Gains (Losses) Recognized in OCI on Derivatives (Effective Portion)									198	6	159
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Gains (Losses) Recognized in OCI on Derivatives (Effective Portion)									0	0	1
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Interest and other, net									0	0	0
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Pre-tax effect of derivative instruments in cash flow and net investment hedging relationships
Gains (Losses) Recognized in OCI on Derivatives (Effective Portion)									$ 2	$ 81	$ (71)