Condensed Consolidating Guarantor and Non-Guarantor Financial Information - Statement of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Jul. 31, 2015	Jul. 31, 2014
Net cash provided by (used in) operations	$ (14)	$ (344)
Net change in restricted cash and cash equivalents	(192)	(30)
Net sales of marketable securities	312	212
Capital expenditures and purchase of equipment leased to others	(130)	(214)
Other investing activities	15	46
Net cash provided by investing activities	5	14
Net borrowings (repayments) of debt	113	112
Other financing activities		22
Other financing activities	(27)	0
Net cash provided by financing activities	86	134
Effect of exchange rate changes on cash and cash equivalents	(27)	(12)
Increase (decrease) in cash and cash equivalents	50	(208)
Cash and cash equivalents at beginning of the period	497	755
Cash and cash equivalents at beginning of the period	547	547
Parent Company [Member]
Net cash provided by (used in) operations	(106)	(528)
Net change in restricted cash and cash equivalents	1	6
Net sales of marketable securities	230	315
Capital expenditures and purchase of equipment leased to others	0	0
Other investing activities	0	0
Net cash provided by investing activities	231	321
Net borrowings (repayments) of debt	0	(11)
Other financing activities		18
Other financing activities	0
Net cash provided by financing activities	0	7
Effect of exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	125	(200)
Cash and cash equivalents at beginning of the period	101	336
Cash and cash equivalents at beginning of the period	226	136
Guarantor Subsidiaries [Member]
Net cash provided by (used in) operations	282	(1,078)
Net change in restricted cash and cash equivalents	1	0
Net sales of marketable securities	0	0
Capital expenditures and purchase of equipment leased to others	(52)	(89)
Other investing activities	3	22
Net cash provided by investing activities	(48)	(67)
Net borrowings (repayments) of debt	(189)	1,067
Other financing activities		44
Other financing activities	(54)
Net cash provided by financing activities	(243)	1,111
Effect of exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	(9)	(34)
Cash and cash equivalents at beginning of the period	53	72
Cash and cash equivalents at beginning of the period	44	38
Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) operations	62	156
Net change in restricted cash and cash equivalents	(194)	(36)
Net sales of marketable securities	82	(103)
Capital expenditures and purchase of equipment leased to others	(78)	(125)
Other investing activities	12	24
Net cash provided by investing activities	(178)	(240)
Net borrowings (repayments) of debt	176	192
Other financing activities		(70)
Other financing activities	(99)
Net cash provided by financing activities	77	122
Effect of exchange rate changes on cash and cash equivalents	(27)	(12)
Increase (decrease) in cash and cash equivalents	(66)	26
Cash and cash equivalents at beginning of the period	343	347
Cash and cash equivalents at beginning of the period	277	373
Consolidation, Eliminations [Member]
Net cash provided by (used in) operations	(252)	1,106
Net change in restricted cash and cash equivalents	0	0
Net sales of marketable securities	0	0
Capital expenditures and purchase of equipment leased to others	0	0
Other investing activities	0	0
Net cash provided by investing activities	0	0
Net borrowings (repayments) of debt	126	(1,136)
Other financing activities		30
Other financing activities	126
Net cash provided by financing activities	252	(1,106)
Effect of exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of the period	0	0
Cash and cash equivalents at beginning of the period	$ 0	$ 0