Fair Value Measurements - Financial Instruments Measured on Recurring Basis (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 31, 2014	Jan. 31, 2014 Fair Value, Measurements, Recurring [Member] Level 1	Oct. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 1	Jan. 31, 2014 Fair Value, Measurements, Recurring [Member] Level 2	Oct. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 2	Jan. 31, 2014 Fair Value, Measurements, Recurring [Member] Level 3	Oct. 31, 2013 Fair Value, Measurements, Recurring [Member] Level 3	Jan. 31, 2014 Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Oct. 31, 2013 Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Jan. 31, 2014 US Treasury Bill Securities [Member] Fair Value, Measurements, Recurring [Member] Level 1	Oct. 31, 2013 US Treasury Bill Securities [Member] Fair Value, Measurements, Recurring [Member] Level 1	Jan. 31, 2014 US Treasury Bill Securities [Member] Fair Value, Measurements, Recurring [Member] Level 2	Oct. 31, 2013 US Treasury Bill Securities [Member] Fair Value, Measurements, Recurring [Member] Level 2	Jan. 31, 2014 US Treasury Bill Securities [Member] Fair Value, Measurements, Recurring [Member] Level 3	Oct. 31, 2013 US Treasury Bill Securities [Member] Fair Value, Measurements, Recurring [Member] Level 3	Jan. 31, 2014 US Treasury Bill Securities [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Oct. 31, 2013 US Treasury Bill Securities [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Jan. 31, 2014 Other Investment Companies [Member] Fair Value, Measurements, Recurring [Member] Level 1	Oct. 31, 2013 Other Investment Companies [Member] Fair Value, Measurements, Recurring [Member] Level 1	Jan. 31, 2014 Other Investment Companies [Member] Fair Value, Measurements, Recurring [Member] Level 2	Oct. 31, 2013 Other Investment Companies [Member] Fair Value, Measurements, Recurring [Member] Level 2	Jan. 31, 2014 Other Investment Companies [Member] Fair Value, Measurements, Recurring [Member] Level 3	Oct. 31, 2013 Other Investment Companies [Member] Fair Value, Measurements, Recurring [Member] Level 3	Jan. 31, 2014 Other Investment Companies [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Oct. 31, 2013 Other Investment Companies [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Jan. 31, 2014 Foreign Exchange Contract [Member] Fair Value, Measurements, Recurring [Member] Level 1	Oct. 31, 2013 Foreign Exchange Contract [Member] Fair Value, Measurements, Recurring [Member] Level 1	Jan. 31, 2014 Foreign Exchange Contract [Member] Fair Value, Measurements, Recurring [Member] Level 2	Oct. 31, 2013 Foreign Exchange Contract [Member] Fair Value, Measurements, Recurring [Member] Level 2	Jan. 31, 2014 Foreign Exchange Contract [Member] Fair Value, Measurements, Recurring [Member] Level 3	Oct. 31, 2013 Foreign Exchange Contract [Member] Fair Value, Measurements, Recurring [Member] Level 3	Jan. 31, 2014 Foreign Exchange Contract [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Oct. 31, 2013 Foreign Exchange Contract [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Jan. 31, 2014 Interest Rate Cap [Member] Fair Value, Measurements, Recurring [Member] Level 1	Oct. 31, 2013 Interest Rate Cap [Member] Fair Value, Measurements, Recurring [Member] Level 1	Jan. 31, 2014 Interest Rate Cap [Member] Fair Value, Measurements, Recurring [Member] Level 2	Oct. 31, 2013 Interest Rate Cap [Member] Fair Value, Measurements, Recurring [Member] Level 2	Jan. 31, 2014 Interest Rate Cap [Member] Fair Value, Measurements, Recurring [Member] Level 3	Oct. 31, 2013 Interest Rate Cap [Member] Fair Value, Measurements, Recurring [Member] Level 3	Jan. 31, 2014 Interest Rate Cap [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member]	Oct. 31, 2013 Interest Rate Cap [Member] Fair Value, Measurements, Recurring [Member] Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and Cash Equivalents, Maturity Term	90 days
Marketable Securities, Maturity Term	90 days
Available-for-sale Securities, Fair Value Disclosure										$ 281	$ 396	$ 0	$ 0	$ 0	$ 0	$ 281	$ 396	$ 349	$ 434	$ 0	$ 0	$ 0	$ 0	$ 349	$ 434
Foreign currency contracts																										0	0	0	4	0	0	0	4	0	0	3	1	0	0	3	1
Assets, Fair Value Disclosure		630	830	3	5	0	0	633	835
Derivative Liability, Fair Value, Gross Liability																										0	0	1	0	0	0	1	0
Guarantees, Fair Value Disclosure		0	0	0	0	6	6	6	6
Liabilities, Fair Value Disclosure		$ 0	$ 0	$ 1	$ 0	$ 6	$ 6	$ 7	$ 6