Postretirement Benefits - Effects of One-Percentage Point Change in Assumed Health Care Cost Trend Rate (Details) (Other Postretirement Benefit Plan, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Oct. 31, 2013
Other Postretirement Benefit Plan, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Effect on total of service and interest cost components - 1% Point Increase	$ 8
Effect on total of service and interest cost components - 1% Point Decrease	(8)
Effect on postretirement benefit obligation - 1% Point Increase	182
Effect on postretirement benefit obligation - 1% Point Decrease	$ (153)