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Supplemental Financial Information Supplemental Financial Information (Major Customers) (Details)		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue from External Customer [Line Items]
Document Period End Date		Dec. 31, 2018
Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		100.00%	100.00%	100.00%
TOTAL [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	[1]	15.00%	22.00%	13.00%
Saudi Aramco [Member] [Domain] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		11.00%	9.00%	6.00%
Petrobras [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		8.00%	11.00%	9.00%
BP [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage	[1]	7.00%	15.00%	12.00%
Other Customers [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		59.00%	43.00%	60.00%
Floaters [Member] | BP [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		27.00%	78.00%	76.00%
Other Rigs [Member] | BP [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		53.00%		17.00%
Jackups Member | BP [Member] | Customer Concentration Risk [Member] | Sales Revenue, Services, Net [Member]
Revenue from External Customer [Line Items]
Concentration Risk, Percentage		20.00%		7.00%
[1] For the years ended December 31, 2018, 2017 and 2016, all Total and Petrobras revenues were attributable to the Floater segment.

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