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Drilling Fleet (Disposal) (Details) $ / shares in Units, $ in Millions |  | 12 Months Ended
--- | --- | ---
May 31, 2017 item | Dec. 31, 2019 USD ($) item | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares
Dispositions |  |  |  |
Number of mobile offshore drilling units | item |  | 45 |  |
Net cash proceeds from sale of assets |  | $ 70 | $ 43 | $ 350
Gain (loss) on the sale of assets |  | (12) |  | (1,603)
Assets held for sale, included in other current assets |  | 0 | 25 |
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 |  |  |
Disposal group operating income |  |  | 44 | 65
Assets sold, not discontinued operations | Rig sales |  |  |  |
Dispositions |  |  |  |
Net cash proceeds from sale of assets |  | 64 | 36 | 22
Gain (loss) on the sale of assets |  | 4 | $ 7 | $ 9
Gain (loss) on the sale of assets per diluted share | $ / shares |  |  | $ 0.01 | $ 0.01
Gain (loss) on disposal of assets, tax effect |  | 0 | $ 0 | $ 0
Assets sold, not discontinued operations | Other property and equipment |  |  |  |
Dispositions |  |  |  |
Net cash proceeds from sale of assets |  | 6 | 7 | 9
Gain (loss) on the sale of assets |  | $ (16) | $ (7) | $ (15)

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