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Financial Instruments - Cash Equivalents and Available-for-Sale Investments (Details) - USD ($) $ in Millions	Oct. 31, 2018	Oct. 31, 2017
Cash equivalents and available-for-sale investments
Cost	$ 3,996	$ 5,398
Fair Value	3,996	5,398
Available-for-Sale Investments:
Debt securities, Cost	714
Total available-for-sale investments, Cost	756	1,194
Total available-for-sale investments, Gross Unrealized Gain	11	17
Total available-for-sale investments, Gross Unrealized Loss	(3)	(1)
Debt securities, Fair Value	711
Total available-for-sale investments, Fair Value	764	1,210
Cost	4,752	6,592
Gross Unrealized Gain	11	17
Gross Unrealized Loss	(3)	(1)
Fair Value	4,760	6,608
Corporate Debt
Cash equivalents and available-for-sale investments
Cost	1,620	1,390
Fair Value	1,620	1,390
Available-for-Sale Investments:
Debt securities, Cost	368	629
Debt securities, Gross Unrealized Gain	0	0
Debt securities, Gross Unrealized Loss	(2)	0
Debt securities, Fair Value	366	629
Financial institution instruments
Cash equivalents and available-for-sale investments
Cost	9	6
Fair Value	9	6
Available-for-Sale Investments:
Debt securities, Cost	32	78
Debt securities, Gross Unrealized Gain	0	0
Debt securities, Gross Unrealized Loss	0	0
Debt securities, Fair Value	32	78
Government debt
Cash equivalents and available-for-sale investments
Cost	2,367	4,002
Fair Value	2,367	4,002
Available-for-Sale Investments:
Debt securities, Cost	314	443
Debt securities, Gross Unrealized Gain	0	0
Debt securities, Gross Unrealized Loss	(1)	(1)
Debt securities, Fair Value	313	442
Marketable equity securities
Available-for-Sale Investments:
Equity securities, Cost	4	5
Equity securities, Gross Unrealized Gain	2	7
Equity securities, Gross Unrealized Loss	0	0
Equity securities, Fair Value	6	12
Mutual funds
Available-for-Sale Investments:
Debt securities, Cost	38	39
Debt securities, Gross Unrealized Gain	9	10
Debt securities, Gross Unrealized Loss	0	0
Debt securities, Fair Value	$ 47	$ 49

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