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Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill
Loss on impairment of goodwill	$ 462		$ 462
Loss on impairment of goodwill, tax effect			0
Contract intangibles
Contract intangible assets		$ 608	795
Capitalized interest
Capitalized interest costs on construction work in progress		38	37	$ 116
Functional currency
Net foreign currency exchange gain (loss)		2	(38)	$ (6)
Materials and supplies
Materials and supplies, allowance for obsolescence		127	134
Restricted cash accounts and investments
Restricted cash investment		558	552
Restricted cash investments classified as current		558	551
Restricted cash investments classified in other assets			1
Assets held for sale
Assets held for sale, included in other current assets		$ 0	$ 25
Property and equipment
Property and equipment as a percentage of total assets		78.00%
Drilling rig units | Minimum
Property and equipment
Estimated original useful life		30 years
Drilling rig units | Maximum
Property and equipment
Estimated original useful life		35 years
Buildings and improvements | Minimum
Property and equipment
Estimated original useful life		2 years
Buildings and improvements | Maximum
Property and equipment
Estimated original useful life		30 years
Machinery and equipment | Minimum
Property and equipment
Estimated original useful life		4 years
Machinery and equipment | Maximum
Property and equipment
Estimated original useful life		20 years

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