Short Term Debt (Details) (USD $)	12 Months Ended
	Oct. 31, 2014	Oct. 31, 2013
Line of Credit Facility [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 850,000,000
Ratio of Indebtedness to Net Capital	0.58
Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date	Oct. 01, 2017
Line of Credit Facility, Current Borrowing Capacity	850,000,000
Line of Credit Facility, Commitment Fee Description	$35,000 plus 8.5 basis
Line of Credit Facility, Frequency of Commitment Fee Payment	annual
Line of Credit Facility, Commitment Fee Amount	35,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	0.085%
Line of Credit Facility, Interest Rate Description	30-day London Interbank Offered Rate (LIBOR) plus from 75 to 125 basis points
Line of Credit Facility, Covenant Terms	total debt to total capitalization of no greater than 70%
Line of Credit Facility, Covenant Compliance	actual ratio was 58%
Debt Covenant Total Debt To Total Capital Ratio	70.00%
Ratio of Indebtedness to Net Capital	0.58
Letter of Credit [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	10,000,000	10,000,000
Letters of Credit Outstanding, Amount	1,800,000	2,100,000
Commercial Paper [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Current Borrowing Capacity	850,000,000
Line of Credit Facility, Interest Rate Description	interest based on, among other things, the size and maturity date of the note, the frequency of the issuance and our credit ratings, plus a spread of 5 basis points
Short-term Debt, Description	$850 million unsecured CP program that is backstopped by the revolving syndicated credit facility. The amounts outstanding under the revolving syndicated credit facility and the CP program, either individually or in the aggregate, cannot exceed $850 million. The notes issued under the CP program may have maturities not to exceed 397 days from the date of issuance and bear interest based on, among other things, the size and maturity date of the note, the frequency of the issuance and our credit ratings, plus a spread of 5 basis points. Any borrowings under the CP program rank equally with our other unsecured debt.
Maximum Number Of Possible Days Outstanding For Commercial Paper Program	397 days
Commercial Paper	355,000,000	400,000,000
Short-term Debt, Weighted Average Interest Rate	0.17%	0.36%
Minimum Amount Outstanding During Period	275,000,000
Maximum Amount Outstanding During Period	$ 625,000,000
Commercial Paper [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Number Days Outstanding From Issuance Until Maturity	4 days
Line of Credit Facility, Interest Rate During Period	0.10%
Commercial Paper [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Number Days Outstanding From Issuance Until Maturity	28 days
Line of Credit Facility, Interest Rate During Period	0.43%
Commercial Paper [Member] | Weighted Average [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Interest Rate During Period	0.19%
Base Rate [Member] | Commercial Paper [Member]
Line of Credit Facility [Line Items]
Debt Instrument Redemption Interest Rate	0.05%
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Debt Instrument Redemption Interest Rate	0.75%
London Interbank Offered Rate (LIBOR) [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Debt Instrument Redemption Interest Rate	1.25%