Commitments And Contingencies (Details) (USD $)	9 Months Ended
	Sep. 30, 2011
Commitments And Contingencies [Abstract]
Indemnification provisions period for losses relating to breaches of representation and warranties, in months	nine
Aggregate amount of quantifiable indemnification agreements in effect for sales of business entities, assets and third party loans	$ 719,000,000
Number of drillships	3
Aggregate cost of the drillships	1,800,000,000
Number of installments	2
Amount of first installments paid	$ 478,000,000