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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Operating revenues    
Contract drilling revenues $ 2,000us-gaap_RevenueOilAndGasServices $ 2,292us-gaap_RevenueOilAndGasServices
Other revenues 43us-gaap_OtherSalesRevenueNet 47us-gaap_OtherSalesRevenueNet
Total operating revenues 2,043us-gaap_Revenues 2,339us-gaap_Revenues
Costs and expenses    
Operating and maintenance 1,084us-gaap_ContractRevenueCost 1,269us-gaap_ContractRevenueCost
Depreciation 291us-gaap_CostOfServicesDepreciationAndAmortization 273us-gaap_CostOfServicesDepreciationAndAmortization
General and administrative 46us-gaap_GeneralAndAdministrativeExpense 57us-gaap_GeneralAndAdministrativeExpense
Total costs and expenses 1,421us-gaap_CostsAndExpenses 1,599us-gaap_CostsAndExpenses
Loss on impairment (936)us-gaap_AssetImpairmentCharges (65)us-gaap_AssetImpairmentCharges
Loss on disposal of assets, net (7)us-gaap_GainLossOnDispositionOfAssets (3)us-gaap_GainLossOnDispositionOfAssets
Operating income (loss) (321)us-gaap_OperatingIncomeLoss 672us-gaap_OperatingIncomeLoss
Other income (expense), net    
Interest income 6us-gaap_InvestmentIncomeInterest 10us-gaap_InvestmentIncomeInterest
Interest expense, net of amounts capitalized (116)us-gaap_InterestExpense (126)us-gaap_InterestExpense
Other, net 47us-gaap_OtherNonoperatingIncomeExpense (2)us-gaap_OtherNonoperatingIncomeExpense
Total other income (expense), net (63)us-gaap_NonoperatingIncomeExpense (118)us-gaap_NonoperatingIncomeExpense
Income (loss) from continuing operations before income tax expense (384)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments 554us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
Income tax expense 83us-gaap_IncomeTaxExpenseBenefit 80us-gaap_IncomeTaxExpenseBenefit
Income (loss) from continuing operations (467)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest 474us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest
Loss (loss) from discontinued operations, net of tax (2)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity (8)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity
Net income (loss) (469)us-gaap_ProfitLoss 466us-gaap_ProfitLoss
Net income (loss) attributable to noncontrolling interest 14us-gaap_NetIncomeLossAttributableToNoncontrollingInterest 10us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Net income (loss) attributable to controlling interest $ (483)us-gaap_NetIncomeLoss $ 456us-gaap_NetIncomeLoss
Earnings (loss) per share-basic    
Earnings (loss) from continuing operations (in dollars per share) $ (1.32)us-gaap_IncomeLossFromContinuingOperationsPerBasicShare $ 1.27us-gaap_IncomeLossFromContinuingOperationsPerBasicShare
Earnings (loss) from discontinued operations (in dollars per share) $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare
Earnings (loss) per share (in dollars per share) $ (1.33)us-gaap_EarningsPerShareBasic $ 1.25us-gaap_EarningsPerShareBasic
Earnings (loss) per share-diluted    
Earnings (loss) from continuing operations (in dollars per share) $ (1.32)us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare $ 1.27us-gaap_IncomeLossFromContinuingOperationsPerDilutedShare
Earnings (loss) from discontinued operations (in dollars per share) $ (0.01)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare $ (0.02)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare
Earnings (loss) per share (in dollars per share) $ (1.33)us-gaap_EarningsPerShareDiluted $ 1.25us-gaap_EarningsPerShareDiluted
Weighted-average shares outstanding    
Basic (in shares) 363us-gaap_WeightedAverageNumberOfSharesOutstandingBasic 361us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares) 363us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding 361us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding