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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Income Taxes      
Annual effective tax rate (as a percent) 25.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations 15.10%us-gaap_EffectiveIncomeTaxRateContinuingOperations  
Reconciliation of the differences between the income tax expense for the entity's continuing operations computed at the Swiss holding company statutory rate and the reported provision for income taxes      
Income tax expense $ 83us-gaap_IncomeTaxExpenseBenefit $ 80us-gaap_IncomeTaxExpenseBenefit  
Deferred taxes      
Valuation allowance for non-current deferred tax assets 395us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent   340us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Unrecognized tax benefits      
Unrecognized tax benefits, excluding interest and penalties 271rig_UnrecognizedTaxBenefitsExcludingInterestAndPenaltiesThatWouldImpactEffectiveTaxRate   265rig_UnrecognizedTaxBenefitsExcludingInterestAndPenaltiesThatWouldImpactEffectiveTaxRate
Interest and penalties 120us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued   120us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued
Unrecognized tax benefits, including interest and penalties $ 391rig_UnrecognizedTaxBenefitsIncludingInterestAndPenalties   $ 385rig_UnrecognizedTaxBenefitsIncludingInterestAndPenalties