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Drilling Fleet (Disposal) (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
May 31, 2017 item | Sep. 30, 2018 USD ($) item | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) item $ / shares | Sep. 30, 2017 USD ($) $ / shares | Dec. 31, 2017 USD ($)
Dispositions |  |  |  |  |  |
Number of mobile offshore drilling units | item |  | 41 |  | 41 |  |
Net cash proceeds from sale of assets |  |  |  | $ 37 | $ 330 |
Gain (loss) on the sale of assets |  | $ (6) | $ (9) |  | (1,602) |
Assets held for sale, included in other current assets |  | 26 |  | $ 26 |  | $ 22
Assets sold, not discontinued operations | High specification jackups |  |  |  |  |  |
Dispositions |  |  |  |  |  |
Number of mobile offshore drilling units | item | 10 |  |  |  |  |
Number of mobile offshore drilling units under construction | item | 5 |  |  |  |  |
Net cash proceeds from sale of assets |  |  |  |  | 319 |
Gain (loss) on the sale of assets |  |  |  |  | $ (1,600) |
Gain (loss) on the sale of assets per diluted share | $ / shares |  |  |  |  | $ (4.08) |
Gain (loss) on disposal of assets, tax effect |  |  |  |  | $ 0 |
Number of high specification jackups operated through contract completion or novation | item | 3 |  |  | 1 |  |
Disposal group operating income |  | $ 10 | 19 | $ 42 | 46 |
Assets sold, not discontinued operations | Rig sales |  |  |  |  |  |
Dispositions |  |  |  |  |  |
Net cash proceeds from sale of assets |  |  |  | 31 |  |
Gain (loss) on the sale of assets |  |  |  | $ 6 |  |
Gain (loss) on the sale of assets per diluted share | $ / shares |  |  |  | $ 0.02 |  |
Gain (loss) on disposal of assets, tax effect |  |  |  | $ 0 |  |
Assets sold, not discontinued operations | Other property and equipment |  |  |  |  |  |
Dispositions |  |  |  |  |  |
Net cash proceeds from sale of assets |  |  | 1 | 6 | 8 |
Gain (loss) on the sale of assets |  |  | $ (9) | $ (6) | (8) |
Assets sold, not discontinued operations | Midwater floaters |  |  |  |  |  |
Dispositions |  |  |  |  |  |
Net cash proceeds from sale of assets |  |  |  |  | 3 |
Gain (loss) on the sale of assets |  |  |  |  | $ 2 |

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