Condensed Consolidating Guarantor and Non-Guarantor Financial Information - Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Jan. 31, 2015	Jan. 31, 2014
Net cash provided by (used in) operations	$ (211)	$ (93)
Net change in restricted cash and cash equivalents	53	(24)
Net sales of marketable securities	430	200
Capital expenditures and purchase of equipment leased to others	(27)	(70)
Other investing activities	1	8
Net cash provided by investing activities	457	114
Net borrowings (repayments) of debt	(107)	(222)
Net cash used in financing activities	(109)	(206)
Effect of exchange rate changes on cash and cash equivalents	(14)	(21)
Increase (decrease) in cash and cash equivalents	123	(206)
Increase (decrease) in cash and cash equivalents	497	755
Cash and cash equivalents at beginning of the period	620	549
Other financing activities	(2)	16
Parent Company [Member]
Net cash provided by (used in) operations	(194)	(446)
Net change in restricted cash and cash equivalents	0	6
Net sales of marketable securities	278	264
Capital expenditures and purchase of equipment leased to others	0	0
Other investing activities	0	0
Net cash provided by investing activities	278	270
Net borrowings (repayments) of debt	0	1
Net cash used in financing activities	0	17
Effect of exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	84	(159)
Increase (decrease) in cash and cash equivalents	101	336
Cash and cash equivalents at beginning of the period	185	177
Other financing activities	0	16
Guarantor Subsidiaries [Member]
Net cash provided by (used in) operations	(46)	(970)
Net change in restricted cash and cash equivalents	(3)	(1)
Net sales of marketable securities	0	0
Capital expenditures and purchase of equipment leased to others	(8)	(18)
Other investing activities	0	1
Net cash provided by investing activities	(11)	(18)
Net borrowings (repayments) of debt	34	936
Net cash used in financing activities	44	956
Effect of exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	(13)	(32)
Increase (decrease) in cash and cash equivalents	53	72
Cash and cash equivalents at beginning of the period	40	40
Other financing activities	10	20
Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) operations	(112)	368
Net change in restricted cash and cash equivalents	56	(29)
Net sales of marketable securities	152	(64)
Capital expenditures and purchase of equipment leased to others	(19)	(52)
Other investing activities	1	7
Net cash provided by investing activities	190	(138)
Net borrowings (repayments) of debt	(80)	(204)
Net cash used in financing activities	(12)	(224)
Effect of exchange rate changes on cash and cash equivalents	(14)	(21)
Increase (decrease) in cash and cash equivalents	52	(15)
Increase (decrease) in cash and cash equivalents	343	347
Cash and cash equivalents at beginning of the period	395	332
Other financing activities	68	(20)
Consolidation, Eliminations [Member]
Net cash provided by (used in) operations	141	955
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	(61)	(955)
Net cash used in financing activities	(141)	(955)
Effect of exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in 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
Other financing activities	$ (80)	$ 0