Condensed Consolidating Guarantor and Non-Guarantor Financial Information - Statement of Cash Flows (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Apr. 30, 2014	Apr. 30, 2013
Net Cash Provided by (Used in) Operating Activities	$ (326)	$ (43)
Net change in restricted cash and cash equivalents	(21)	44
Net purchases of marketable securities	296	(267)
Capital expenditures and purchase of equipment leased to others	(158)	(402)
Other investing activities	25	49
Net cash provided by (used in) investing activities	142	(576)
Net borrowings (repayments) of debt	11	(222)
Other financing activities	22	264
Net cash provided by financing activities	33	42
Effect of exchange rate changes on cash and cash equivalents	(10)	(5)
Decrease in cash and cash equivalents	(161)	(582)
Cash and cash equivalents at beginning of the period	755	1,087
Cash and cash equivalents at end of the period	594	505
Parent Company [Member]
Net Cash Provided by (Used in) Operating Activities	(458)	(648)
Net change in restricted cash and cash equivalents	5	(1)
Net purchases of marketable securities	389	(186)
Capital expenditures and purchase of equipment leased to others	0	0
Other investing activities	0	0
Net cash provided by (used in) investing activities	394	(187)
Net borrowings (repayments) of debt	(10)	327
Other financing activities	18	24
Net cash provided by financing activities	8	351
Effect of exchange rate changes on cash and cash equivalents	0	0
Decrease in cash and cash equivalents	(56)	(484)
Cash and cash equivalents at beginning of the period	336	702
Cash and cash equivalents at end of the period	280	218
Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities	(961)	(288)
Net change in restricted cash and cash equivalents	(1)	0
Net purchases of marketable securities	0	0
Capital expenditures and purchase of equipment leased to others	(67)	(304)
Other investing activities	8	9
Net cash provided by (used in) investing activities	(60)	(295)
Net borrowings (repayments) of debt	959	301
Other financing activities	34	263
Net cash provided by financing activities	993	564
Effect of exchange rate changes on cash and cash equivalents	0	0
Decrease in cash and cash equivalents	(28)	(19)
Cash and cash equivalents at beginning of the period	72	55
Cash and cash equivalents at end of the period	44	36
Non-Guarantor Subsidiaries [Member]
Net Cash Provided by (Used in) Operating Activities	85	222
Net change in restricted cash and cash equivalents	(25)	45
Net purchases of marketable securities	(93)	(81)
Capital expenditures and purchase of equipment leased to others	(91)	(98)
Other investing activities	17	40
Net cash provided by (used in) investing activities	(192)	(94)
Net borrowings (repayments) of debt	68	(179)
Other financing activities	(30)	(23)
Net cash provided by financing activities	38	(202)
Effect of exchange rate changes on cash and cash equivalents	(8)	(5)
Decrease in cash and cash equivalents	(77)	(79)
Cash and cash equivalents at beginning of the period	347	330
Cash and cash equivalents at end of the period	270	251
Consolidation, Eliminations [Member]
Net Cash Provided by (Used in) Operating Activities	1,008	671
Net change in restricted cash and cash equivalents	0	0
Net purchases 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 (used in) investing activities	0	0
Net borrowings (repayments) of debt	(1,006)	(671)
Other financing activities	0	0
Net cash provided by financing activities	(1,006)	(671)
Effect of exchange rate changes on cash and cash equivalents	(2)	0
Decrease in cash and cash equivalents	0	0
Cash and cash equivalents at beginning of the period	0	0
Cash and cash equivalents at end of the period	$ 0	$ 0