Condensed Consolidating Guarantor and Non-Guarantor Financial Information - Statement of Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Jul. 31, 2017	Jul. 31, 2016
Net cash provided by (used in) operating activities	$ (168)	$ (14)
Net change in restricted cash and cash equivalents	(25)	(64)
Net sales (purchases) of marketable securities	(16)	19
Capital expenditures and purchase of equipment leased to others	(189)	(177)
Other investing activities	36	55
Net Cash Provided by (Used in) Investing Activities	(194)	(167)
Net borrowings (repayments) of debt	194	(207)
Proceeds from Issuance of Common Stock, Net of Issuance Costs	245
Other financing activities	29	(10)
Net cash provided by (used in) financing activities	468	(217)
Effect of exchange rate changes on cash and cash equivalents	1	33
Increase (decrease) in cash and cash equivalents	107	(365)
Cash and cash equivalents at beginning of the period	804	912
Cash and cash equivalents at end of the period	911	547
Parent Company [Member]
Net cash provided by (used in) operating activities	(307)	(372)
Net change in restricted cash and cash equivalents	0	0
Net sales (purchases) of marketable securities	(16)	113
Capital expenditures and purchase of equipment leased to others	0	0
Other investing activities	(250)	0
Net Cash Provided by (Used in) Investing Activities	(266)	113
Net borrowings (repayments) of debt	542	0
Proceeds from Issuance of Common Stock, Net of Issuance Costs	245
Other financing activities	3	0
Net cash provided by (used in) financing activities	790	0
Effect of exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	217	(259)
Cash and cash equivalents at beginning of the period	435	456
Cash and cash equivalents at end of the period	652	197
Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	(401)	(225)
Net change in restricted cash and cash equivalents	2	4
Net sales (purchases) of marketable securities	0	0
Capital expenditures and purchase of equipment leased to others	(132)	(56)
Other investing activities	6	0
Net Cash Provided by (Used in) Investing Activities	(124)	(52)
Net borrowings (repayments) of debt	384	263
Proceeds from Issuance of Common Stock, Net of Issuance Costs	0
Other financing activities	47	18
Net cash provided by (used in) financing activities	431	281
Effect of exchange rate changes on cash and cash equivalents	0	0
Increase (decrease) in cash and cash equivalents	(94)	4
Cash and cash equivalents at beginning of the period	117	81
Cash and cash equivalents at end of the period	23	85
Non-Guarantor Subsidiaries [Member]
Net cash provided by (used in) operating activities	(126)	344
Net change in restricted cash and cash equivalents	(27)	(68)
Net sales (purchases) of marketable securities	0	(94)
Capital expenditures and purchase of equipment leased to others	(57)	(121)
Other investing activities	30	55
Net Cash Provided by (Used in) Investing Activities	(54)	(228)
Net borrowings (repayments) of debt	(58)	(151)
Proceeds from Issuance of Common Stock, Net of Issuance Costs	250
Other financing activities	(29)	(108)
Net cash provided by (used in) financing activities	163	(259)
Effect of exchange rate changes on cash and cash equivalents	1	33
Increase (decrease) in cash and cash equivalents	(16)	(110)
Cash and cash equivalents at beginning of the period	252	375
Cash and cash equivalents at end of the period	236	265
Consolidation, Eliminations [Member]
Net cash provided by (used in) operating activities	666	239
Net change in restricted cash and cash equivalents	0	0
Net sales (purchases) of marketable securities	0	0
Capital expenditures and purchase of equipment leased to others	0	0
Other investing activities	250	0
Net Cash Provided by (Used in) Investing Activities	250	0
Net borrowings (repayments) of debt	(674)	(319)
Proceeds from Issuance of Common Stock, Net of Issuance Costs	(250)
Other financing activities	8	80
Net cash provided by (used in) financing activities	(916)	(239)
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 end of the period	$ 0	$ 0