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The carrying amount of the equity component of convertible debt which may be settled in cash upon conversion.

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Face (par) amount of debt instrument at time of issuance.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of the required periodic payments including both interest and principal payments.

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Amount of the required periodic payments applied to interest.

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Amount of letters of credit outstanding under debtor-in-possession financing arrangement.

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No definition available.

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Amount of reorganization items related to discharge of claims and liabilities upon emergence from bankruptcy.

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Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

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The fee, expressed as a percentage of the line of credit facility, for the line of credit facility regardless of whether the facility has been used.

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No definition available.

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Amount of long-term debt related to debtor-in-possession financing at the balance sheet date before fresh-start adjustments.

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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Including the current and noncurrent portions, carrying value as of the balance sheet date of uncollateralized debt obligations (with maturities initially due after one year or beyond the operating cycle if longer).

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Bankruptcy Claims, Principal Of Outstanding Debt Held By Parties In Restructuring Support Agreement, Percent

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Debt Instrument, Covenant, Minimum Liquidity

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Debt Instrument, Percent Of Principal Outstanding

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Existing Unsecured Notes Cancelled and Exchanged for stock of the reorganized company percentage

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Existing equity will be cancelled and exchanged for Warrants percentage

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Chapter 11 Proceedings and Ability to Continue as a Going Concern - Narrative (Details) - USD ($)					3 Months Ended
	Jul. 12, 2019	Jul. 03, 2019	Jul. 01, 2019	Jun. 15, 2019	Jun. 30, 2019	May 10, 2019
Subsequent Event [Line Items]
Debtor Reorganization Items, Discharge of Claims and Liabilities					$ 5,850,000,000
Existing Unsecured Notes Cancelled and Exchanged for stock of the reorganized company percentage					99.00%
Unsecured Debt						$ 1,250,000,000
Existing equity will be cancelled and exchanged for New Equity percentage					1.00%
Existing equity will be cancelled and exchanged for Warrants percentage					10.00%
Preconfirmation, Debtor-in-Possession Financing					$ 1,250,000,000
Subsequent Event
Subsequent Event [Line Items]
Percentage of principal of outstanding debt held by parties in restructuring support agreement	80.00%
Common Stock
Subsequent Event [Line Items]
Debt Instrument, Convertible, Carrying Amount of Equity Component					500,000,000
Senior Lien \| Revolving Credit Facility
Subsequent Event [Line Items]
Preconfirmation, Debtor-in-Possession Financing					1,000,000,000.0
DIP Credit Agreement \| Subsequent Event
Subsequent Event [Line Items]
Line of Credit Facility, Commitment Fee Percentage		0.375%
DIP Credit Agreement \| Revolving Credit Facility \| Subsequent Event
Subsequent Event [Line Items]
Preconfirmation, Debtor-in-Possession Financing		$ 750,000,000
DIP Credit Agreement \| Term Loan Agreement
Subsequent Event [Line Items]
Debt Instrument, Periodic Payment					$ 12,500,000
DIP Credit Agreement \| Term Loan Agreement \| Subsequent Event
Subsequent Event [Line Items]
Preconfirmation, Debtor-in-Possession Financing		1,000,000,000.0
Repayments of Debt		616,000,000
Debt Instrument, Covenant, Minimum Liquidity		150,000,000
Proceeds from Issuance of Debt		1,400,000,000
Debtor-in-Possession Financing, Letters of Credit Outstanding		$ 271,000,000
Credit Agreement Forbearance Agreement \| Subsequent Event
Subsequent Event [Line Items]
Debt Instrument, Percent Of Principal Outstanding			0.25%
Guarantor Obligations, Maximum Exposure, Undiscounted			$ 100,000,000
Backstop Commitment Agreement \| Subsequent Event
Subsequent Event [Line Items]
Debt Instrument, Face Amount			1,250,000,000
Repayments of Debt			$ 62,500,000
London Interbank Offered Rate (LIBOR) \| DIP Credit Agreement \| Subsequent Event
Subsequent Event [Line Items]
Debt Instrument, Basis Spread on Variable Rate		3.00%
Base Rate \| DIP Credit Agreement \| Subsequent Event
Subsequent Event [Line Items]
Debt Instrument, Basis Spread on Variable Rate		2.00%
Minimum \| London Interbank Offered Rate (LIBOR) \| DIP Credit Agreement \| Subsequent Event
Subsequent Event [Line Items]
Debt Instrument, Basis Spread on Variable Rate		0.00%
Senior Notes
Subsequent Event [Line Items]
Debt Instrument, Periodic Payment, Interest				$ 69,000,000
Senior Notes \| Senior Notes, 7.75 Percent due 2021
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					7.75%
Senior Notes \| Senior Notes, 8.25 Percent due 2023
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					8.25%
Senior Notes \| Senior Notes, 6.80% due 2037
Subsequent Event [Line Items]
Debt Instrument, Interest Rate, Stated Percentage					6.80%