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Impairment of Long-Lived Assets - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 9 Months Ended |
|---|---|---|
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Sep. 30, 2014
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Sep. 30, 2014
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| Impaired Assets to be Disposed of by Method Other than Sale [Line Items] | ||
| Impairment loss recognized related to Drilling rigs | $ 109 | $ 109 |
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Diamond Offshore [Member]
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| Impaired Assets to be Disposed of by Method Other than Sale [Line Items] | ||
| Fair value of rigs | 17 | 17 |
| Impairment loss after tax and non controlling interest | $ 55 | $ 55 |