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Quarterly Results (Unaudited) (Explanatory) (Details) - USD ($) $ in Millions	3 Months Ended					6 Months Ended		9 Months Ended	12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Dec. 31, 2018	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Aggregate loss on impairment of assets held for sale									$ 578
Operating lease impairment		$ 26							26
Loss on retirement of debt									(41)	$ (3)	$ (55)
Gain on termination of construction contracts	$ 132								132
Acquisition costs					$ 24		$ 24			24	4
Loss on impairment of goodwill				$ 462						462
Rig sales
Aggregate loss on impairment of assets held for sale		$ 583						$ 999		999	$ 1,400
Ocean Rig
Bargain purchase gain			$ 10			$ 11			$ 11	$ 10

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This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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In a business combination in which the amount of net identifiable assets acquired and liabilities assumed exceeds the aggregate consideration transferred or to be transferred (as defined), this element represents the amount of gain recognized by the entity.

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Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform.

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Difference between the fair value of payments made and the carrying amount of debt which is extinguished prior to maturity.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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