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Business Combinations (Details) $ / shares in Units, shares in Millions, $ in Millions |  |  |  |  | 9 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 04, 2018 USD ($) $ / shares shares | Mar. 28, 2018 USD ($) shares | Jan. 30, 2018 USD ($) item $ / shares shares | Jan. 16, 2018 shares | Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($)
Business Combination |  |  |  |  |  |
Number of mobile offshore drilling units | item |  |  |  |  | 41 |
Aggregate consideration |  |  |  |  |  |
Acquisition of noncontrolling interest in compulsory acquisition |  |  |  |  | $ 31 |
Ultra-deepwater floaters |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Number of mobile offshore drilling units | item |  |  |  |  | 23 |
Number of mobile offshore drilling units under construction | item |  |  |  |  | 2 |
Harsh environment floaters |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Number of mobile offshore drilling units | item |  |  |  |  | 12 |
Number of mobile offshore drilling units under construction | item |  |  |  |  | 1 |
Ocean Rig |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Number of mobile offshore drilling units | item |  |  |  |  | 11 |
Ocean Rig | Ultra-deepwater floaters |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Number of mobile offshore drilling units | item |  |  |  |  | 9 |
Number of mobile offshore drilling units under construction | item |  |  |  |  | 2 |
Ocean Rig | Harsh environment floaters |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Number of mobile offshore drilling units | item |  |  |  |  | 2 |
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 |  |  |  |  |
Maximum cash consideration | $ 1,170 |  |  |  |  |
Songa |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Business combination consideration (per share) | $ / shares |  |  | $ 10.99 |  |  |
Newly issued shares (in shares) | shares |  | 68.0 | 66.9 |  |  |
Number of mobile offshore drilling units | item |  |  | 7 |  |  |
Ownership interest (as a percent) |  |  | 97.70% |  |  |
Acquisition costs |  |  |  |  | $ 7 | $ 3
Aggregate consideration |  |  |  |  |  |
Aggregate fair value of shares issued as partial consideration for Songa shares |  |  | $ 735 |  |  |
Consideration transferred to Songa shareholders |  |  | 1,410 |  |  |
Total consideration |  |  | 1,761 |  |  |
Issuance of shares in acquisition transactions (in shares) | shares |  | 1.1 |  |  |  |
Cash payment to acquire noncontrolling interest |  | $ 8 |  |  |  |
Songa | Maximum |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Newly issued shares (in shares) | shares |  |  |  | 68.6 |  |
Songa | 0.50% Exchangeable Bonds due January 2023 |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Convertible debt |  | 9 | 854 |  |  |
Aggregate consideration |  |  |  |  |  |
Acquisition of noncontrolling interest in compulsory acquisition |  | $ 30 |  |  |  |
Songa | 0.50% Exchangeable Bonds, acquire Songa shares |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Convertible debt |  |  | 562 |  |  |
Aggregate consideration |  |  |  |  |  |
Aggregate fair value of Exchangeable Bonds issued |  |  | 675 |  |  |
Songa | 0.50% Exchangeable Bonds, settle Songa debt |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Convertible debt |  |  | 292 |  |  |
Aggregate consideration |  |  |  |  |  |
Aggregate fair value of Exchangeable Bonds issued |  |  | $ 351 |  |  |
Songa | Harsh environment floaters |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Number of mobile offshore drilling units | item |  |  | 5 |  |  |
Songa | High specification harsh environment floaters |  |  |  |  |  |
Business Combination |  |  |  |  |  |
Number of mobile offshore drilling units | item |  |  | 4 |  |  |

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