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Drilling Fleet (Disposal) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Dispositions
Net cash proceeds from sale of assets			$ 16	$ 36
Gain (loss) on the sale of assets	$ 1	$ (15)		(20)
Assets sold, not discontinued operations | Rig sales
Dispositions
Net cash proceeds from sale of assets		1	11	25
Gain (loss) on the sale of assets	3	1	8	7
Assets sold, not discontinued operations | Sale of other assets
Dispositions
Net cash proceeds from sale of assets	1	2	5	8
Gain (loss) on the sale of assets	(2)	$ (16)	(8)	$ (27)
Assets held for sale
Dispositions
Aggregate carrying amount of assets held for sale	$ 6		$ 6		$ 8

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Amount classified as property, plant and equipment attributable to disposal group held for sale or disposed of.

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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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