General Information	3 Months Ended
Mar. 31, 2020
Accounting Policies [Abstract]
General Information	1. General Information The unaudited condensed consolidated financial statements of Diamond Offshore Drilling, Inc. and subsidiaries, which we refer to as “Diamond Offshore,” “we,” “us” or “our,” should be read in conjunction with our Annual Report on Form 10-K/A for the year ended December 31, 2019 (File No. 1-13926). As of May 1, 2020, Loews Corporation owned approximately 53% of the outstanding shares of our common stock. Interim Financial Information The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S.”) (“GAAP”), for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X of the Securities and Exchange Commission. Accordingly, pursuant to such rules and regulations, they do not include all disclosures required by GAAP for annual financial statements. The condensed consolidated financial information has not been audited but, in the opinion of management, includes all adjustments (consisting of normal recurring adjustments) necessary for a fair presentation of Diamond Offshore’s condensed consolidated balance sheets, statements of operations, statements of comprehensive loss, statements of stockholders’ equity and statements of cash flows at the dates and for the periods indicated. Results of operations for interim periods are not necessarily indicative of results of operations for the respective full years. Use of Estimates in the Preparation of Financial Statements The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reporting period. Actual results could differ from those estimated. Recently Adopted Accounting Pronouncements In June 2016, the Financial Accounting Standards Board issued Accounting Standards Update, or ASU, No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 replaces the incurred loss impairment methodology under previous GAAP by requiring entities to measure credit losses of certain financial assets, including trade receivables, utilizing a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. We adopted ASU 2016-13 and its related amendments (collectively, “CECL”) effective January 1, 2020, by recognizing a cumulative-effect adjustment which was not material to our unaudited condensed consolidated financial statements. CECL has been applied prospectively and therefore, prior periods have not been adjusted. See Notes 5 and 7. Asset Held for Sale We reported the $1.0 million net book value of the Ocean Confidence, a previously impaired semisubmersible rig that was cold stacked in 2015, as “Asset held for sale” in our Consolidated Balance Sheets at December 31, 2019. The rig was sold in February 2020 for a net pre-tax gain of $3.5 million.

General Information

3 Months Ended

Mar. 31, 2020

1. General Information

The unaudited condensed consolidated financial statements of Diamond Offshore Drilling, Inc. and subsidiaries, which we refer to as “Diamond Offshore,” “we,” “us” or “our,” should be read in conjunction with our Annual Report on Form 10-K/A for the year ended December 31, 2019 (File No. 1-13926).

As of May 1, 2020, Loews Corporation owned approximately 53% of the outstanding shares of our common stock.

Interim Financial Information

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“U.S.”) (“GAAP”), for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X of the Securities and Exchange Commission. Accordingly, pursuant to such rules and regulations, they do not include all disclosures required by GAAP for annual financial statements. The condensed consolidated financial information has not been audited but, in the opinion of management, includes all adjustments (consisting of normal recurring adjustments) necessary for a fair presentation of Diamond Offshore’s condensed consolidated balance sheets, statements of operations, statements of comprehensive loss, statements of stockholders’ equity and statements of cash flows at the dates and for the periods indicated. Results of operations for interim periods are not necessarily indicative of results of operations for the respective full years.

Use of Estimates in the Preparation of Financial Statements

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amount of revenues and expenses during the reporting period. Actual results could differ from those estimated.

Recently Adopted Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board issued Accounting Standards Update, or ASU, No. 2016-13, Financial Instruments – Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 replaces the incurred loss impairment methodology under previous GAAP by requiring entities to measure credit losses of certain financial assets, including trade receivables, utilizing a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates.

We adopted ASU 2016-13 and its related amendments (collectively, “CECL”) effective January 1, 2020, by recognizing a cumulative-effect adjustment which was not material to our unaudited condensed consolidated financial statements. CECL has been applied prospectively and therefore, prior periods have not been adjusted. See Notes 5 and 7.

Asset Held for Sale

We reported the $1.0 million net book value of the Ocean Confidence, a previously impaired semisubmersible rig that was cold stacked in 2015, as “Asset held for sale” in our Consolidated Balance Sheets at December 31, 2019. The rig was sold in February 2020 for a net pre-tax gain of $3.5 million.