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Drilling Fleet (Disposal) (Details) $ / shares in Units, $ in Millions		3 Months Ended		6 Months Ended
	May 31, 2017 item	Jun. 30, 2017 USD ($) $ / shares	Jun. 30, 2016 USD ($) $ / shares	Jun. 30, 2017 USD ($) $ / shares	Jun. 30, 2016 USD ($) $ / shares	Dec. 31, 2016 USD ($)
Dispositions
Net cash proceeds from sale of assets				$ 329	$ 15
Gain (loss) on the sale of assets		$ (1,595)	$ (2)	(1,593)	(1)
Assets held for sale
Dispositions
Assets held for sale, included in other current assets		5		5		$ 6
Assets held for sale | Rig sales
Dispositions
Aggregate loss on impairment of assets held for sale		$ 17	$ 12	$ 17	$ 15
Aggregate loss on impairment of assets per diluted share | $ / shares		$ 0.04	$ 0.03	$ 0.04	$ 0.04
Aggregate loss on impairment of assets held for sale, tax effect		$ 0		$ 0
Aggregate loss on impairment of assets held for sale, net of tax					$ 14
Assets sold, not discontinued operations | Rig sales
Dispositions
Net cash proceeds from sale of assets			$ 8	3	11
Gain (loss) on the sale of assets			4	2	5
Assets sold, not discontinued operations | Sell of Standard Jackup and swamp barge market sectors
Dispositions
Number of High-Specification Jackups (in drilling units) | item	10
Number of High-Specification Jackup under construction (in drilling units) | item	5
Number of high specification jackups operated through contract completion or novation | item	3
Number of high specification jackups no longer operated | item	1
Net cash proceeds from sale of assets		319		319
Gain (loss) on the sale of assets		$ (1,600)		$ (1,600)
Gain (loss) on the sale of assets per diluted share | $ / shares		$ (4.08)		$ (4.08)
Gain (loss) on disposal of assets, tax effect		$ 0		$ 0
Disposal group operating income		9	8	27	22
Assets sold, not discontinued operations | Sale of other assets
Dispositions
Net cash proceeds from sale of assets		$ 6	$ 3	7	4
Gain (loss) on the sale of assets				$ 1	$ (6)

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Number of High-Specification Jackups. High-Specification Jackups are harsh environment and high-performance jackups. Jackups are self-elevating drilling platforms that have legs that can be lowered to the ocean floor to establish a foundation to support the drilling platform. These units are generally suited for water depths of 400 feet or less.

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Number of High-Specification Jackups under construction.

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Amount classified as assets attributable to disposal group held for sale or disposed of, expected to be disposed of within one year or the normal operating cycle, if longer.

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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.

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