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Drilling Fleet (Disposal) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2020 USD ($) item	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Dispositions
Number of mobile offshore drilling units | item	41
Net cash proceeds from sale of assets	$ 1	$ 12
Gain (loss) on the sale of assets	(1)	$ 7
Assets held for sale, included in other current assets	5		$ 0
Assets sold, not discontinued operations | Rig sales
Dispositions
Net cash proceeds from sale of assets	11
Gain (loss) on the sale of assets	1
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
Gain (loss) on the sale of assets	$ (6)

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