Contractual interest rate for funds borrowed, under the debt agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Borrowings - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
Borrowings - Narrative (Details) - USD ($)	Apr. 30, 2018	Apr. 30, 2017	Apr. 30, 2018	Apr. 30, 2017	Mar. 31, 2018	Dec. 31, 2017	Nov. 30, 2017	Nov. 01, 2015	Dec. 31, 2011	Sep. 30, 2011	May 31, 2011
Line of Credit Facility [Line Items]
Loss on early extinguishment of debt	$ 126,000,000	$ 0	$ 126,000,000	$ 0
Commercial paper
Line of Credit Facility [Line Items]
Maximum borrowing capacity under credit facility	6,000,000,000.0		6,000,000,000.0				$ 6,000,000,000.0	$ 4,000,000,000.0
Revolving credit facility
Line of Credit Facility [Line Items]
Maximum borrowing capacity under credit facility	4,000,000,000		4,000,000,000			$ 1,500,000,000.0
Credit facilities
Line of Credit Facility [Line Items]
Available borrowing resources	722,000,000		$ 722,000,000
U.S. Dollar Global Notes
Line of Credit Facility [Line Items]
Aggregate principal amount of outstanding debt extinguished	$ 1,850,000,000
4.65% notes due December 2021
Line of Credit Facility [Line Items]
Interest rate (percent)					4.65%				4.65%
4.375% notes due September 2021
Line of Credit Facility [Line Items]
Interest rate (percent)										4.375%
4.300% notes due June 2021
Line of Credit Facility [Line Items]
Interest rate (percent)											4.30%