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Significant Accounting Policies (Details) (USD $) In Millions, except Per Share data, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Share-based compensation expense |  |
Share-based compensation expense | $ 19 us-gaap_AllocatedShareBasedCompensationExpense | $ 28 us-gaap_AllocatedShareBasedCompensationExpense
Capitalized interest |  |
Capitalized interest costs on construction work in progress | 26 us-gaap_InterestCostsCapitalized | 34 us-gaap_InterestCostsCapitalized
Property and equipment |  |
Property and equipment as a percentage of total assets | 76.00%rig_PropertyAndEquipmentAsPercentageOfTotalAssets |
Drilling rig units |  |
Property and equipment |  |
Increase in depreciation expense due to adjustment in salvage value | 30 rig_ChangeInEstimateDepreciationIncreaseDecreaseDuringPeriod / us-gaap_PropertyPlantAndEquipmentByTypeAxis = rig_DrillingRigsMember |
Increase in depreciation expense due to adjustment in salvage value, net of tax | 28 rig_ChangeInEstimateDepreciationIncreaseDecreaseDuringPeriodNetOfTax / us-gaap_PropertyPlantAndEquipmentByTypeAxis = rig_DrillingRigsMember |
Increase in depreciation expense due to adjustment in salvage value per diluted per share | $ 0.08 rig_ChangeInEstimateDepreciationIncreaseDecreaseDuringPeriodPerShareDiluted / us-gaap_PropertyPlantAndEquipmentByTypeAxis = rig_DrillingRigsMember |
Increase in depreciation expense in 2015 due to adjustment in salvage value | 76 rig_ChangeInEstimateDepreciationIncreaseDecreaseForCurrentFiscalYear / us-gaap_PropertyPlantAndEquipmentByTypeAxis = rig_DrillingRigsMember |
Increase in depreciation expense in 2015 due to adjustment in salvage value, net of tax | $ 73 rig_ChangeInEstimateDepreciationIncreaseDecreaseForCurrentFiscalYearNetOfTax / us-gaap_PropertyPlantAndEquipmentByTypeAxis = rig_DrillingRigsMember |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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