Postretirement Benefits Expected Future Benefit Payments (Details) (USD $) In Millions, unless otherwise specified	Oct. 31, 2011
Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2012	$ 325
2013	320
2014	313
2015	307
2016	299
2017 through 2021	1,388
Other Postretirement Benefit Plans [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
2012	171	[1]
2013	152	[1]
2014	147	[1]
2015	144	[1]
2016	140	[1]
2017 through 2021	$ 628	[1]

[1] Payments are net of expected participant contributions and expected federal subsidy receipts.