v2.4.0.8

Impairments (Details 2) (USD $) In Millions, except Per Share data, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012
Impairment of definite-lived intangible assets |
Impairment loss on definite-lived intangible asset | $ 22
Customer relationships |
Impairment of definite-lived intangible assets |
Impairment loss on definite-lived intangible asset | 22
Impairment loss on finite-lived intangible asset, continuing operations | $ 17
Impairment loss on long-lived assets per diluted share, continuing operations | $ 0.05

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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value charge to continuing operations, net of tax + References No definition available. + Details
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Namespace Prefix: | rig_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The loss from impairment charge to continuing operations on assets per each share of dilutive common stock during the reporting period. + References No definition available. + Details
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Namespace Prefix: | rig_
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Period Type: | duration

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- Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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