v2.4.0.8

Drilling Fleet (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		1 Months Ended	6 Months Ended
	Jun. 30, 2014 drillingunit item	Jun. 30, 2013	Jun. 30, 2014 drillingunit item	Jun. 30, 2013	Oct. 31, 2011 Aker Drilling	Jun. 30, 2013 Transocean Siam Driller	Jun. 30, 2013 Transocean Andaman	Jun. 30, 2013 Transocean Ao Thai	Jun. 30, 2014 Deepwater Asgard	Jun. 30, 2013 Deepwater Asgard	Jun. 30, 2014 Deepwater Invictus	Jun. 30, 2013 Deepwater Invictus	Jun. 30, 2014 Deepwater Thalassa	Jun. 30, 2013 Deepwater Thalassa	Jun. 30, 2014 Deepwater Proteus	Jun. 30, 2013 Deepwater Proteus	Jun. 30, 2014 Deepwater Conqueror	Jun. 30, 2014 Deepwater Pontus	Jun. 30, 2013 Deepwater Pontus	Jun. 30, 2014 Deepwater Poseidon	Jun. 30, 2013 Deepwater Poseidon	Jun. 30, 2014 High-Specification Jackup TBN1	Jun. 30, 2014 High-Specification Jackup TBN2	Jun. 30, 2014 High-Specification Jackup TBN3	Jun. 30, 2014 High-Specification Jackup TBN4	Jun. 30, 2014 Ultra-Deepwater drillship TBN1	Jun. 30, 2014 High Specification Jackup TBN5	Jun. 30, 2014 Ultra-Deepwater drillship TBN2	Jun. 30, 2014 Other construction projects and capital additions	Jun. 30, 2013 Other construction projects and capital additions	Jun. 30, 2014 Other property and equipment	Jun. 30, 2013 Other property and equipment	Jun. 30, 2014 Deepwater Asgard and Deepwater Invictus drillingunit	Jun. 30, 2014 Deepwater Thalassa, Deepwater Proteus, Deepwater Pontus and Deepwater Poseidon drillingunit
Changes in construction work in progress, including capital expenditures and other capital additions, such as capitalized interest
Construction work in progress, at beginning of period			$ 2,710	$ 2,010
Total capital expenditures	351	352	1,482	840		74	82	13	272	24	477	25	58	84	21	82	109	83	4	80	3	3	2	2	2	28	2	27	316	449
Changes in accrued capital expenditures			(76)	(29)
Property and equipment placed into service						(236)	(242)																								(350)	(506)
Construction work in progress, at end of period	3,766	1,837	3,766	1,837
Number of Ultra-Deepwater Floaters under construction	2		2																														2	4
Acquisition of construction work in progress					$ 272
Number of High Specification Jackups under construction	5		5

X

- Definition

Represents the estimated fair value of initial investment in the construction project.

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No definition available.

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The change in accrued but unpaid capital expenditures.

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Number of High-Specification Jackups under construction.

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Number of Ultra-Deepwater Floaters under construction.

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- Definition

Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133



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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

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Amount of reclassification, impairment, donation, or other change to long-lived, physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 360

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (a)

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