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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Cash flows from operating activities    
Net income (loss) $ (469)us-gaap_ProfitLoss $ 466us-gaap_ProfitLoss
Adjustments to reconcile to net cash provided by operating activities:    
Amortization of drilling contract intangibles (4)rig_AmortizationOfDrillingContractIntangibles (4)rig_AmortizationOfDrillingContractIntangibles
Depreciation 291us-gaap_DepreciationDepletionAndAmortization 273us-gaap_DepreciationDepletionAndAmortization
Share-based compensation expense 19us-gaap_ShareBasedCompensation 28us-gaap_ShareBasedCompensation
Loss on impairment 936us-gaap_AssetImpairmentCharges 65us-gaap_AssetImpairmentCharges
Loss on disposal of assets, net 7us-gaap_GainLossOnSaleOfPropertyPlantEquipment 3us-gaap_GainLossOnSaleOfPropertyPlantEquipment
Loss on disposal of assets in discontinued operations, net   10us-gaap_DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax
Deferred income taxes (98)us-gaap_DeferredIncomeTaxExpenseBenefit (15)us-gaap_DeferredIncomeTaxExpenseBenefit
Other, net 12us-gaap_OtherNoncashIncomeExpense 12us-gaap_OtherNoncashIncomeExpense
Changes in deferred revenue, net (39)us-gaap_IncreaseDecreaseInDeferredRevenue (26)us-gaap_IncreaseDecreaseInDeferredRevenue
Changes in deferred costs, net 57us-gaap_IncreaseDecreaseInDeferredCharges 38us-gaap_IncreaseDecreaseInDeferredCharges
Changes in operating assets and liabilities (186)us-gaap_IncreaseDecreaseInOperatingCapital (714)us-gaap_IncreaseDecreaseInOperatingCapital
Net cash provided by operating activities 526us-gaap_NetCashProvidedByUsedInOperatingActivities 136us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash flows from investing activities    
Capital expenditures (201)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment (1,131)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from disposal of assets, net 7us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment 91us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Proceeds from disposal of assets in discontinued operations, net 2us-gaap_ProceedsFromDivestitureOfBusinesses 14us-gaap_ProceedsFromDivestitureOfBusinesses
Other, net   (12)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities (192)us-gaap_NetCashProvidedByUsedInInvestingActivities (1,038)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash flows from financing activities    
Repayments of debt (63)us-gaap_RepaymentsOfLongTermDebt (237)us-gaap_RepaymentsOfLongTermDebt
Proceeds from restricted cash investments 57us-gaap_ProceedsFromSaleOfRestrictedInvestments 107us-gaap_ProceedsFromSaleOfRestrictedInvestments
Deposits to restricted cash investments   (20)us-gaap_PaymentsToAcquireRestrictedInvestments
Distribution of qualifying additional paid-in capital (272)us-gaap_PaymentsOfCapitalDistribution (202)us-gaap_PaymentsOfCapitalDistribution
Distribution to holders of noncontrolling interest (7)us-gaap_PaymentsOfDividendsMinorityInterest  
Other, net (2)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities (2)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash used in financing activities (287)us-gaap_NetCashProvidedByUsedInFinancingActivities (354)us-gaap_NetCashProvidedByUsedInFinancingActivities
Net increase (decrease) in cash and cash equivalents 47us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease (1,256)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period 2,635us-gaap_CashAndCashEquivalentsAtCarryingValue 3,243us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period $ 2,682us-gaap_CashAndCashEquivalentsAtCarryingValue $ 1,987us-gaap_CashAndCashEquivalentsAtCarryingValue