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Business (Merger and business combination) (Details) $ / shares in Units, shares in Millions, $ in Millions | Sep. 04, 2018 $ / shares shares | Mar. 28, 2018 USD ($) shares | Jan. 30, 2018 item $ / shares shares | Sep. 30, 2018 USD ($) item | Dec. 31, 2017 USD ($)
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Business Combination |  |  |  |  |
Number of mobile offshore drilling units |  |  |  | 41 |
Aggregate principal amount outstanding | $ |  |  |  | $ 9,434 | $ 7,484
0.50% Exchangeable Bonds due January 2023 |  |  |  |  |
Business Combination |  |  |  |  |
Aggregate principal amount outstanding | $ |  | $ 863 |  | $ 863 |
Debt instrument interest rate stated percentage |  |  |  | 0.50% |
Ocean Rig |  |  |  |  |
Business Combination |  |  |  |  |
Number of mobile offshore drilling units |  |  |  | 11 |
Ultra-deepwater floaters |  |  |  |  |
Business Combination |  |  |  |  |
Number of mobile offshore drilling units |  |  |  | 23 |
Ultra-deepwater floaters | Ocean Rig |  |  |  |  |
Business Combination |  |  |  |  |
Number of mobile offshore drilling units |  |  |  | 9 |
Harsh environment floaters |  |  |  |  |
Business Combination |  |  |  |  |
Number of mobile offshore drilling units |  |  |  | 12 |
Harsh environment floaters | Ocean Rig |  |  |  |  |
Business Combination |  |  |  |  |
Number of mobile offshore drilling units |  |  |  | 2 |
Midwater floaters |  |  |  |  |
Business Combination |  |  |  |  |
Number of mobile offshore drilling units |  |  |  | 4 |
Ocean Rig |  |  |  |  |
Business Combination |  |  |  |  |
Ratio of shares to be issued for consideration | 1.6128 |  |  |  |
Business combination consideration (per share) | $ / shares | $ 12.75 |  |  |  |
Newly issued shares (in shares) | shares | 147.7 |  |  |  |
Songa |  |  |  |  |
Business Combination |  |  |  |  |
Ownership interest (as a percent) |  |  | 97.70% |  |
Business combination consideration (per share) | $ / shares |  |  | $ 10.99 |  |
Number of mobile offshore drilling units |  |  | 7 |  |
Newly issued shares (in shares) | shares |  | 68.0 | 66.9 |  |
Songa | 0.50% Exchangeable Bonds due January 2023 |  |  |  |  |
Business Combination |  |  |  |  |
Aggregate principal amount outstanding | $ |  | $ 863 |  |  |
Debt instrument interest rate stated percentage |  | 0.50% |  |  |
Songa | Harsh environment floaters |  |  |  |  |
Business Combination |  |  |  |  |
Number of mobile offshore drilling units |  |  | 5 |  |
Songa | Midwater floaters |  |  |  |  |
Business Combination |  |  |  |  |
Number of mobile offshore drilling units |  |  | 2 |  |

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