Financial Instruments - Schedule of Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions	Jul. 31, 2016	Oct. 31, 2015
Cash Equivalents:
Cash equivalents, Cost	$ 4,442	$ 5,414
Cash equivalents, Fair Value	4,442	5,414
Available-for-Sale Investments:
Available-for-sale securities, Cost	39	35
Available-for-sale securities, Gross Unrealized Gain	16	14
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale securities, Estimated Fair Value	55	49
Total cash equivalents and available-for-sale investments	4,481	5,449
Cash Equivalents and Available For Sale Securities, Fair Value	4,497	5,463
Equity securities in public companies
Available-for-Sale Investments:
Available-for-sale securities, Cost	1	1
Available-for-sale securities, Gross Unrealized Gain	5	4
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale securities, Estimated Fair Value	6	5
Foreign bonds
Available-for-Sale Investments:
Available-for-sale securities, Cost	36	32
Available-for-sale securities, Gross Unrealized Gain	11	10
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax	0	0
Available-for-sale securities, Estimated Fair Value	47	42
Other debt securities
Available-for-Sale Investments:
Available-for-sale securities, Cost	2	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	2	2
Time deposits
Cash Equivalents:
Cash equivalents, Cost	1,915	1,111
Cash equivalents, Fair Value	1,915	1,111
Money market funds
Cash Equivalents:
Cash equivalents, Cost	2,527	4,303
Cash equivalents, Fair Value	$ 2,527	$ 4,303

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.

+ References

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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