Financial Instruments - Schedule of Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions	Apr. 30, 2017	Oct. 31, 2016
Cash Equivalents:
Cash equivalents, Cost	$ 4,823	$ 4,660
Cash equivalents, Fair Value	4,823	4,660
Available-for-Sale Investments:
Available-for-sale securities, Cost	37	38
Available-for-sale securities, Gross Unrealized Gain	16	12
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale securities, Estimated Fair Value	53	50
Total cash equivalents and available-for-sale investments	4,860	4,698
Total cash equivalents and available-for-sale investments, Fair Value	4,876	4,710
Marketable equity securities
Available-for-Sale Investments:
Available-for-sale securities, Cost	1	1
Available-for-sale securities, Gross Unrealized Gain	7	3
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale securities, Estimated Fair Value	8	4
Mutual funds
Available-for-Sale Investments:
Available-for-sale securities, Cost	36	35
Available-for-sale securities, Gross Unrealized Gain	9	9
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale securities, Estimated Fair Value	45	44
Other debt securities
Available-for-Sale Investments:
Available-for-sale securities, Cost	0	2
Available-for-sale securities, Gross Unrealized Gain	0	0
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale securities, Estimated Fair Value	0	2
Time deposits
Cash Equivalents:
Cash equivalents, Cost	2,790	2,092
Cash equivalents, Fair Value	2,790	2,092
Money market funds
Cash Equivalents:
Cash equivalents, Cost	2,033	2,568
Cash equivalents, Fair Value	$ 2,033	$ 2,568

Cash Equivalents and Available For Sale Securities, Amortized Cost Basis

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Cash Equivalents and Available For Sale Securities, Fair Value

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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-Publisher FASB
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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