The aggregate value for the disposal group, including a component of the entity (discontinued operations), carrying value (net of accumulated depreciation and any write-downs) of property, plant and equipment and other current assets that are held for sale apart from normal operations and anticipated to be sold in less than one year.

No definition available.

Discontinued Operations (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended					12 Months Ended								0 Months Ended	1 Months Ended		12 Months Ended					12 Months Ended							1 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Customer relationships	Dec. 31, 2012 Trade name intangible asset	Dec. 31, 2013 Sell of Standard Jackup and swamp barge market sectors	Dec. 31, 2012 Sell of Standard Jackup and swamp barge market sectors drillingunit	Dec. 31, 2012 GSF Adriatic II and GSF Rig 136	Nov. 30, 2012 Shelf Drilling Holdings, Ltd	Jun. 30, 2013 Shelf Drilling Holdings, Ltd	Sep. 30, 2012 Shelf Drilling Holdings, Ltd	Dec. 31, 2013 Shelf Drilling Holdings, Ltd	Dec. 31, 2012 Shelf Drilling Holdings, Ltd	Dec. 31, 2013 Shelf Drilling Holdings, Ltd drillingunit	Dec. 31, 2012 Shelf Drilling Holdings, Ltd	Nov. 30, 2012 Shelf Drilling Holdings, Ltd drillingunit	Dec. 31, 2013 Shelf Drilling Holdings, Ltd Minimum	Dec. 31, 2013 Shelf Drilling Holdings, Ltd Maximum	Dec. 31, 2013 Standard jackups GSF Rig 134, GSF Rig 127, D.R. Stewart, GSF Adriatic VIII, Interocean III, Trident IV A and Trident VI and related equipment	Dec. 31, 2012 Standard jackups GSF Adriatic II, GSF Rig 103, GSF Rig 136, Roger W. Mowell, Transocean Nordic, Transocean Shelf Explorer and Trident 17 and related equipment	Dec. 31, 2011 High-Specification Jackup Trident 20	Dec. 31, 2012 Challenger Minerals	Dec. 31, 2011 Challenger Minerals	May 31, 2012 Challenger Minerals (North Sea)	Dec. 31, 2011 Challenger Minerals (North Sea)	Dec. 31, 2012 Challenger Minerals Inc. and Challenger Minerals (Ghana) Limited	Dec. 31, 2011 Challenger Minerals Inc. and Challenger Minerals (Ghana) Limited	Dec. 31, 2011 Standard Jackups George H. Galloway and GSF Britannia, GSF Labrador and swamp barge Searex IV	Dec. 31, 2011 Standard Jackups George H. Galloway and GSF Britannia, GSF Labrador and swamp barge Searex IV Maximum	Dec. 31, 2011 Standard Jackups George H. Galloway, GSF Adriatic IX, GSF Britannia, GSF Labrador, and Transocean Mercury and swamp barge Searex IV and related equipment and ownership interest in Joides Resolution
Summarized results of discontinued operations
Operating revenues						$ 796	$ 1,055	$ 1,171
Operating and maintenance expense						(800)	(990)	(871)
Depreciation and amortization expense							(183)	(342)
Loss on impairment of assets in discontinued operations						(14)	(986)	(38)			(14)		(29)														(10)	(6)					(28)
Gain (loss) on disposal of assets in discontinued operations, net						54	82	183																		169					9	(4)
Other income, net						5		18
Income (loss) from discontinued operations before income tax expense						41	(1,022)	121
Income tax expense						(40)	(5)	(36)
Income (loss) from discontinued operations, net of tax						1	(1,027)	85
Assets
Rigs and related equipment, net		104					104
Materials and supplies, net		71				18	71					8							18	63
Other related assets		4				1	4
Assets held for sale		179				19	179
Liabilities
Deferred revenue		32				8	32
Other liabilities		3					3
Other current liabilities		35				8	35
Summarized results of Discontinued Operations
Goodwill allocated to disposal group												112
Number of Standard Jackups (in drilling units)												7							7
Aggregate carrying amounts of assets associated with disposal group												112
Impairment loss per diluted share from discontinued operations, net of tax											$ 0.04		$ 0.08														$ 0.02	$ 0.02			$ 0.02	$ 0.02	$ 0.09
Impairment costs for certain shipyard projects and other obligations required pursuant to the sale agreement																60
Legal and financial advisory costs																17
Long live assets impairment loss		3	878	12	93							744
Long live assets impairment loss per diluted share from discontinued operations, net of tax												$ 2.09
Long live assets impairment loss, tax effect											0	0	0																					1
Goodwill impairment loss							112					112
Goodwill impairment loss per diluted share from discontinued operations, net of tax							$ 0.31					$ 0.31
Impairment costs relating to postemployment benefits																		20
Number of Drilling Units Sold																					38
Proceeds from disposal of assets, net						174	191	14						568			64	30						140	198	259			10						187
Non-cash proceeds from sale of assets														195
Proceeds from disposal of discontinued operations non-cash estimated fair value							194							194
Proceeds from sale of preference shares						185									185
Recognized loss on sale of preference shares																	10
Recognized loss on sale of preference shares per diluted share (in dollars per share)																	$ 0.03
Period for which Standard Jackups are agreed to be operated under operating agreements																						9 months	27 months
Aggregate gain (loss) on disposal of assets, net						7	36	(12)									11	8						44	74										32
Gain (loss) on sale of assets, net of tax																		(5)														14
Aggregate gain on sale of assets per diluted share (in dollars per share)																	$ 0.03	$ 0.01						$ 0.12	$ 0.20	$ 0.52						$ 0.05			$ 0.10
Expected transition services offering period																							18 months
Term of letters of credit																							3 years
Maximum financial support																			125
Letters of credit issued under committed and uncommitted credit lines																			104	113
Maximum additional financial support, excluding parent guarantees																			65
Aggregate gain (loss) on disposal of assets, tax effect																	0							0	0	0					0				0
Recognized aggregate net loss on disposal of assets unrelated to dispositions of rigs																								(1)	(9)										(1)
Impairment loss on indefinite-lived intangible asset									31	39
Loss on impairment of assets held for sale net of tax									20	25
Loss on impairment of assets per diluted share									$ 0.06	$ 0.07
Loss on impairment of assets held for sale	37																										11	10
Proceeds from disposal of discontinued operations, net						204	789	447																						24	13
(Gain) loss on disposal of assets in discontinued operations, tax effect																															$ 0