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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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