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

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

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Amount of consideration received or receivable for the disposal of assets and liabilities, including discontinued operation.

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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 associated with the amount received from the sale of a portion of the company's business, for example a segment, division, branch or other business, during the period.

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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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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 New Equity percentage

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Existing equity will be cancelled and exchanged for Warrants percentage

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Subsequent Event (Details) - USD ($) $ in Millions	3 Months Ended
Subsequent Event (Details) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Mar. 31, 2018	May 10, 2019	Apr. 30, 2019
Subsequent Event [Line Items]
Proceeds from Divestiture of Businesses		$ 74	$ 25
Subsequent Event
Subsequent Event [Line Items]
Debtor Reorganization Items, Discharge of Claims and Liabilities	$ 5,850
Existing Unsecured Notes Cancelled and Exchanged for stock of the reorganized company percentage	99.00%
Unsecured Debt				$ 1,250
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
Subsequent Event \| Laboratory Service Business \| Discontinued Operations, Disposed of by Sale
Subsequent Event [Line Items]
Disposal Group, Including Discontinued Operation, Consideration					$ 206
Subsequent Event \| Surface Data Logging Business [Member] \| Discontinued Operations, Disposed of by Sale
Subsequent Event [Line Items]
Proceeds from Divestiture of Businesses	50
Credit Facility [Domain] \| Subsequent Event
Subsequent Event [Line Items]
Preconfirmation, Debtor-in-Possession Financing	750
Term Loan Agreement [Member] \| Subsequent Event
Subsequent Event [Line Items]
Preconfirmation, Debtor-in-Possession Financing	1,000
Senior Lien [Member] \| Credit Facility [Domain] \| Subsequent Event
Subsequent Event [Line Items]
Preconfirmation, Debtor-in-Possession Financing	1,000
Common Stock [Member] \| Subsequent Event
Subsequent Event [Line Items]
Debt Instrument, Convertible, Carrying Amount of Equity Component	$ 500