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Drilling Fleet (Details 2) (Sale of Deepwater Floater Sedco 709, the Midwater Floaters GSF Aleutian Key, C Kirk Rhein Jr. and Sedco 703 along with related equipment, USD $) In Millions, unless otherwise specified	Jun. 30, 2013
Sale of Deepwater Floater Sedco 709, the Midwater Floaters GSF Aleutian Key, C Kirk Rhein Jr. and Sedco 703 along with related equipment
Assets held for sale
Aggregate carrying amount of assets held for sale	$ 9

X

- Definition

Long-lived assets that are held for sale apart from normal operations and anticipated to be sold in less than one year.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 20

-Section 45

-Paragraph 10

-URI http://asc.fasb.org/extlink&oid=6892542&loc=d3e1107-107759



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 144

-Paragraph 46

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Details

Name:	us-gaap_LongLivedAssetsHeldForSaleLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration