|
Supplemental Disclosures Required by Swiss Law (Details) (USD $)
In Billions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
|
| Supplemental Disclosures Required by Swiss Law | |||
| Personnel expenses recognized | $ 2.6 | $ 2.5 | $ 2.6 |
| Aggregate value of drilling rig fleet | $ 27.2 | $ 29.3 | |