OTHER COMPREHENSIVE INCOME ITEMS - After-Tax Changes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Accumulated other comprehensive income (loss)
Balance			$ 6,757.6	$ 9,065.5
Net current period other comprehensive income (loss)	$ (63.4)	$ (213.9)	147.3	(724.8)
Balance	7,439.7	7,725.0	7,439.7	7,725.0
Total Accumulated Other Comprehensive Income (Loss)
Accumulated other comprehensive income (loss)
Balance			(4,729.0)	(3,783.0)
Other comprehensive income (loss) items before reclassification			36.0	(851.0)
Amounts reclassified from accumulated other comprehensive income (loss)			111.0	127.0
Net current period other comprehensive income (loss)			147.0	(724.0)
Balance	(4,582.0)	(4,507.0)	(4,582.0)	(4,507.0)
Retirement Benefits Adjustment
Accumulated other comprehensive income (loss)
Balance			(3,501.0)	(3,493.0)
Other comprehensive income (loss) items before reclassification			(23.0)	(23.0)
Amounts reclassified from accumulated other comprehensive income (loss)			110.0	127.0
Net current period other comprehensive income (loss)	30.0	41.0	87.0	104.0
Balance	(3,414.0)	(3,389.0)	(3,414.0)	(3,389.0)
Cumulative Translation Adjustment
Accumulated other comprehensive income (loss)
Balance			(1,238.0)	(303.0)
Other comprehensive income (loss) items before reclassification			54.0	(832.0)
Net current period other comprehensive income (loss)	(99.0)	(255.0)	54.0	(832.0)
Balance	(1,184.0)	(1,135.0)	(1,184.0)	(1,135.0)
Unrealized Gain (Loss) on Derivatives
Accumulated other comprehensive income (loss)
Balance			(2.0)
Other comprehensive income (loss) items before reclassification	(1.0)	(2.0)	(2.0)	(5.0)
Amounts reclassified from accumulated other comprehensive income (loss)			3.0	4.0
Net current period other comprehensive income (loss)		(1.0)	1.0	(1.0)
Balance	(1.0)	(1.0)	(1.0)	(1.0)
Unrealized Gain (Loss) on Investments
Accumulated other comprehensive income (loss)
Balance			12.0	13.0
Other comprehensive income (loss) items before reclassification	7.0	3.0	7.0	9.0
Amounts reclassified from accumulated other comprehensive income (loss)			(2.0)	(4.0)
Net current period other comprehensive income (loss)	6.0	1.0	5.0	5.0
Balance	$ 17.0	$ 18.0	$ 17.0	$ 18.0