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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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