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FRESH START ACCOUNTING - Liabilities Subject to Compromise (Details) - USD ($) $ in Millions | Oct. 31, 2020 | Oct. 31, 2014
--- | --- | ---
Debt Instrument [Line Items] |  |
Accrued interest on long-term debt | $ 164 |
Liabilities Subject to Compromise, Total | 4,516 |
2017 Credit Agreement |  |
Debt Instrument [Line Items] |  |
Liabilities subject to compromise gross | 1,300 |
2016 Credit Agreement |  |
Debt Instrument [Line Items] |  |
Liabilities subject to compromise gross | 1,000 |
Second Lien Notes |  |
Debt Instrument [Line Items] |  |
Liabilities subject to compromise gross | $ 1,808 |
Senior Notes (Unsecured) | 5.5% Senior Notes due 2021 |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 0.055% | 5.50%
Liabilities subject to compromise gross | $ 100 |
Senior Notes (Unsecured) | 6% Senior Notes due 2024 |  |
Debt Instrument [Line Items] |  |
Debt instrument, interest rate, stated percentage | 6.00% | 6.00%
Liabilities subject to compromise gross | $ 144 |

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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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