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		6 Months Ended			6 Months Ended				1 Months Ended		3 Months Ended	6 Months Ended				6 Months Ended		3 Months Ended	6 Months Ended		1 Months Ended		3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012	Jun. 30, 2012 Customer relationships	Jun. 30, 2012 Trade name intangible asset	Jun. 30, 2013 Sell of Standard Jackup and swamp barge market sectors	Dec. 31, 2012 Sell of Standard Jackup and swamp barge market sectors	Jun. 30, 2013 Shelf Drilling Holdings, Ltd	Nov. 30, 2012 Shelf Drilling Holdings, Ltd	Jun. 30, 2013 Shelf Drilling Holdings, Ltd	Jun. 30, 2013 Shelf Drilling Holdings, Ltd	Jun. 30, 2013 Shelf Drilling Holdings, Ltd drillingunit	Dec. 31, 2012 Shelf Drilling Holdings, Ltd	Nov. 30, 2012 Shelf Drilling Holdings, Ltd drillingunit	Jun. 30, 2013 Shelf Drilling Holdings, Ltd Minimum	Jun. 30, 2013 Shelf Drilling Holdings, Ltd Maximum	Jun. 30, 2013 Standard Jackups D.R. Stewart, Interocean III and GSF Adriatic VIII and related equipment	Jun. 30, 2013 Standard Jackups D.R. Stewart, Interocean III and GSF Adriatic VIII and related equipment	Jun. 30, 2012 Challenger Minerals	Apr. 30, 2012 Challenger Minerals Inc.	May 31, 2012 Challenger Minerals (North Sea)	Jun. 30, 2012 Challenger Minerals (North Sea)	Jun. 30, 2012 Challenger Minerals (North Sea)	Jun. 30, 2012 GSF Adriatic II and GSF Rig 136	Jun. 30, 2012 GSF Adriatic II and GSF Rig 136	Jun. 30, 2012 Standard Jackups, GSF Adriatic II, GSF Rig 136, Roger W. Mowell, Transocean Nordic and Transocean Shelf Explorer	Jun. 30, 2012 Standard Jackups, GSF Adriatic II, GSF Rig 136, Roger W. Mowell, Transocean Nordic and Transocean Shelf Explorer
Summarized results of discontinued operations
Operating revenues	$ 229	$ 248	$ 469	$ 478
Operating and maintenance expense	(233)	(255)	(482)	(478)
Depreciation and amortization expense		(65)		(135)
Loss on impairment of assets in discontinued operations, net		(12)		(105)																	(4)					(12)	(29)
Gain on disposal of assets in discontinued operations, net	3	72	18	71																				10	10
Income (loss) from discontinued operations before income tax expense	(1)	(12)	5	(169)
Income tax benefit (expense)	(9)	12	(15)	33
Income (loss) from discontinued operations, net of tax	(10)		(10)	(136)
Assets
Rigs and related equipment, net	59		59		104
Materials and supplies, net	68		68		71			4	8
Other related assets	7		7		4
Assets held for sale	134		134		179
Liabilities
Deferred revenue	57		57		32
Other liabilities					3
Other current liabilities	57		57		35
Summarized results of Discontinued Operations
Aggregate carrying amounts of assets associated with disposal group								63	112					64	63
Impairment loss per diluted share from discontinued operations, net of tax																					$ 0.01					$ 0.03	$ 0.08
Long live assets impairment loss, tax effect																				0						0	0	0	0
Number of Drilling Units Sold																38
Period for which Standard Jackups are agreed to be operated under operating agreements																	9 months	27 months
Number of Standard Jackups (in drilling units)														24
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														102	113	113
Maximum additional financial support, excluding parent guarantees														65
Proceeds from disposal of assets, net	3	1	4	8							568									63								145	179
Non-cash proceeds from sale of assets											196
Proceeds from disposal of discontinued operations non-cash estimated fair value											194
Cash proceeds received from the sale of preference shares	185		185							185
Recognized loss on sale of preference shares												10	10
Recognized loss on sale of preference shares per diluted share (in dollars per share)												$ 0.03	$ 0.03
Aggregate gain (loss) on disposal of assets, net	(2)	(7)	(9)	(10)																15								64	64
Aggregate gains on sale of assets per diluted share																				$ 0.04								$ 0.18	$ 0.18
Aggregate gain (loss) on disposal of assets, tax effect																				0								0	0
Recognized aggregate net gains (losses) on disposal of unrelated assets																			3	3								(2)	(3)
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																					6
Proceeds from disposal of discontinued operations, net		$ 160	$ 63	$ 194																		$ 7	$ 10