Postretirement Benefits - Schedule of Changes for Financial Instruments Classified Within Level 3 of Valuation Hierarchy (Details) (USD $) In Millions, unless otherwise specified											12 Months Ended								12 Months Ended						12 Months Ended				12 Months Ended				12 Months Ended
	Oct. 31, 2013 Other Postretirement Benefit Plan, Defined Benefit [Member]	Oct. 31, 2012 Other Postretirement Benefit Plan, Defined Benefit [Member]	Oct. 31, 2011 Other Postretirement Benefit Plan, Defined Benefit [Member]	Oct. 31, 2013 Pension Plan, Defined Benefit [Member]	Oct. 31, 2012 Pension Plan, Defined Benefit [Member]	Oct. 31, 2011 Pension Plan, Defined Benefit [Member]	Oct. 31, 2013 Hedge Funds Other Postretirement Benefit Plan, Defined Benefit [Member]	Oct. 31, 2012 Hedge Funds Other Postretirement Benefit Plan, Defined Benefit [Member]	Oct. 31, 2013 Hedge Funds Pension Plan, Defined Benefit [Member]	Oct. 31, 2012 Hedge Funds Pension Plan, Defined Benefit [Member]	Oct. 31, 2013 Hedge Funds Level 3 Other Postretirement Benefit Plan, Defined Benefit [Member]	Oct. 31, 2012 Hedge Funds Level 3 Other Postretirement Benefit Plan, Defined Benefit [Member]	Oct. 31, 2013 Hedge Funds Level 3 Pension Plan, Defined Benefit [Member]	Oct. 31, 2012 Hedge Funds Level 3 Pension Plan, Defined Benefit [Member]	Oct. 31, 2013 Private Equity Other Postretirement Benefit Plan, Defined Benefit [Member]	Oct. 31, 2012 Private Equity Other Postretirement Benefit Plan, Defined Benefit [Member]	Oct. 31, 2013 Private Equity Pension Plan, Defined Benefit [Member]	Oct. 31, 2012 Private Equity Pension Plan, Defined Benefit [Member]	Oct. 31, 2013 Private Equity Level 3 Other Postretirement Benefit Plan, Defined Benefit [Member]	Oct. 31, 2012 Private Equity Level 3 Other Postretirement Benefit Plan, Defined Benefit [Member]	Oct. 31, 2013 Private Equity Level 3 Pension Plan, Defined Benefit [Member]	Oct. 31, 2012 Private Equity Level 3 Pension Plan, Defined Benefit [Member]	Oct. 31, 2013 Real Estate Pension Plan, Defined Benefit [Member]	Oct. 31, 2012 Real Estate Pension Plan, Defined Benefit [Member]	Oct. 31, 2013 Real Estate Level 3 Pension Plan, Defined Benefit [Member]	Oct. 31, 2012 Real Estate Level 3 Pension Plan, Defined Benefit [Member]	Oct. 31, 2013 Fixed income derivative Pension Plan, Defined Benefit [Member]	Oct. 31, 2012 Fixed income derivative Pension Plan, Defined Benefit [Member]	Oct. 31, 2013 Fixed income derivative Level 3 Pension Plan, Defined Benefit [Member]	Oct. 31, 2012 Fixed income derivative Level 3 Pension Plan, Defined Benefit [Member]	Oct. 31, 2013 Equity derivative Pension Plan, Defined Benefit [Member]	Oct. 31, 2012 Equity derivative Pension Plan, Defined Benefit [Member]	Oct. 31, 2013 Equity derivative Level 3 Pension Plan, Defined Benefit [Member]	Oct. 31, 2012 Equity derivative Level 3 Pension Plan, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	$ 447	$ 437	$ 463	$ 2,519	$ 2,411	$ 2,392	$ 21	$ 19	$ 101	$ 92	$ 19	$ 25	$ 92	$ 99	$ 26	$ 23	$ 103	$ 92	$ 23	$ 19	$ 92	$ 75	$ 1	$ 1	$ 1	$ 1	$ (13)	$ 19	$ 19	$ 0	$ (72)	$ 4	$ 4	$ 0
Unrealized gains (losses)											2	(2)	8	(1)					5	2	18	10			0	0			(32)	19			(90)	4
Realized gains											0	2							0	0
Realized gains (losses)													1	4							0	0			0	0			4	0			10	0
Purchases, issuances, and settlements											0	(6)	0	(10)					(2)	2	(7)	7			0	0			(4)	0			4	0
Fair value of plan assets at end of year	$ 447	$ 437	$ 463	$ 2,519	$ 2,411	$ 2,392	$ 21	$ 19	$ 101	$ 92	$ 21	$ 19	$ 101	$ 92	$ 26	$ 23	$ 103	$ 92	$ 26	$ 23	$ 103	$ 92	$ 1	$ 1	$ 1	$ 1	$ (13)	$ 19	$ (13)	$ 19	$ (72)	$ 4	$ (72)	$ 4