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NEW ACCOUNTING PRONOUNCEMENTS- Textuals (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Nov. 01, 2018	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2019	Apr. 30, 2018	Oct. 31, 2018
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent		21.00%
Retained earnings (accumulated deficit)	$ (303)	$ 178		$ 178		$ (336)
Long-term Investments	75	96		96		$ 68
Impact of adoption of new guidance	(7)			(7)
Impact of Adopting New Revenue Guidance
Retained earnings (accumulated deficit)	23
Long-term Investments	0
Impact of Adopting New Tax Effects in AOCI Guidance
Retained earnings (accumulated deficit)	7
Long-term Investments	0
Impact of Adopting New Intra-Entity Tax Guidance
Retained earnings (accumulated deficit)	(2)
Long-term Investments	0
Impact of Adopting New Investments Valuation Guidance
Retained earnings (accumulated deficit)	5
Long-term Investments	$ 7
Impact of Adopting New Retirement Benefits Guidance
Impact of adoption of new guidance		$ 3	$ 5	$ 5	$ 15

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- Definition

Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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