Postretirement Benefits Components of Net Periodic Benefit Expense (Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 31, 2013	Jan. 31, 2012
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost for benefits earned during the period	$ 5	$ 4
Interest on obligation	36	43
Amortization of cumulative loss	32	28
Amortization of Prior Service Cost (benefit)	0	0
Contractual termination benefits	0	0
Expected Return on Plan Assets	(47)	(48)
Net postretirement benefit expense	26	27
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Service cost for benefits earned during the period	2	1
Interest on obligation	15	21
Amortization of cumulative loss	7	9
Amortization of Prior Service Cost (benefit)	(1)	(1)
Contractual termination benefits	0	(2)
Expected Return on Plan Assets	(8)	(9)
Net postretirement benefit expense	$ 15	$ 19