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

X

- Definition

Increase (decrease) in depreciation expense during the period due changes in the assumption in the estimate. The change in the assumption can include change in the estimated life and salvage value.

+ References

No definition available.

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Increase (decrease) in depreciation expense during the period due changes in the assumption in the estimate, net of tax. The change in the assumption can include change in the estimated life and salvage value.

+ References

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- Definition

Increase (decrease) in depreciation expense per each share of dilutive common stock during the period due to changes in the assumption in the estimate. The change in the assumption can include change in the estimated life and salvage value.

+ References

No definition available.

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- Definition

Increase (decrease) in depreciation expense in the current fiscal year due changes in the assumption in the estimate. The change in the assumption can include change in the estimated life and salvage value.

+ References

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Increase (decrease) in depreciation expense in the current fiscal year due changes in the assumption in the estimate, net of tax. The change in the assumption can include change in the estimated life and salvage value.

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- Definition

Percentage of total assets represented by property and equipment at end of period.

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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

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-SubTopic 10

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- Definition

Amount of interest capitalized during the period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Allowance for Funds Used during Construction

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