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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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