Condensed Consolidating Financial Information (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014	Mar. 31, 2014	Dec. 31, 2013
Assets
Cash and cash equivalents	$ 2,682	$ 2,635	$ 1,987	$ 3,243
Other current assets	3,161rig_OtherAssetsCurrentLessCash	3,366rig_OtherAssetsCurrentLessCash
Total current assets	5,843us-gaap_AssetsCurrent	6,001us-gaap_AssetsCurrent
Property and equipment, net	20,566us-gaap_PropertyPlantAndEquipmentNet	21,538us-gaap_PropertyPlantAndEquipmentNet
Other assets	696	874
Total assets	27,105us-gaap_Assets	28,413us-gaap_Assets
Liabilities and equity
Debt due within one year	1,024us-gaap_LongTermDebtCurrent	1,033us-gaap_LongTermDebtCurrent
Other current liabilities	2,149	2,737
Total current liabilities	3,173us-gaap_LiabilitiesCurrent	3,770us-gaap_LiabilitiesCurrent
Long-term debt	8,996us-gaap_LongTermDebtNoncurrent	9,059us-gaap_LongTermDebtNoncurrent
Other long-term liabilities	1,415rig_OtherLiabilitiesNoncurrentLessDebt	1,591rig_OtherLiabilitiesNoncurrentLessDebt
Total long-term liabilities	10,411us-gaap_LiabilitiesNoncurrent	10,650us-gaap_LiabilitiesNoncurrent
Commitments and contingencies
Redeemable noncontrolling interest	11	11
Total equity	13,510	13,982	17,175	16,685
Total liabilities and equity	27,105	28,413
Reportable Entity \| Parent Guarantor
Assets
Cash and cash equivalents	19	16	27	4
Other current assets	3	12
Total current assets	22	28
Investment in affiliates	13,210	13,952
Total assets	13,232	13,980
Liabilities and equity
Other current liabilities	6	287
Total current liabilities	6	287
Other long-term liabilities	25	22
Total long-term liabilities	25	22
Commitments and contingencies
Total equity	13,201	13,671
Total liabilities and equity	13,232	13,980
Reportable Entity \| Subsidiary Issuer
Assets
Cash and cash equivalents	1,160	842	710	1,617
Other current assets	741	757
Total current assets	1,901	1,599
Investment in affiliates	30,270	30,925
Other assets	4,241	3,899
Total assets	36,412	36,423
Liabilities and equity
Debt due within one year	896	898
Other current liabilities	465	473
Total current liabilities	1,361	1,371
Long-term debt	22,217	21,486
Other long-term liabilities	285	280
Total long-term liabilities	22,502	21,766
Commitments and contingencies
Total equity	12,549	13,286
Total liabilities and equity	36,412	36,423
Reportable Entity \| Other Subsidiaries
Assets
Cash and cash equivalents	1,503	1,777	1,250	1,622
Other current assets	4,908	5,228
Total current assets	6,411	7,005
Property and equipment, net	20,566	21,538
Other assets	26,637	25,883
Total assets	53,614	54,426
Liabilities and equity
Debt due within one year	128	135
Other current liabilities	4,169	4,608
Total current liabilities	4,297	4,743
Long-term debt	16,961	16,481
Other long-term liabilities	1,105	1,289
Total long-term liabilities	18,066	17,770
Commitments and contingencies
Redeemable noncontrolling interest	11	11
Total equity	31,240	31,902
Total liabilities and equity	53,614	54,426
Consolidating adjustments
Assets
Other current assets	(2,491)	(2,631)
Total current assets	(2,491)	(2,631)
Investment in affiliates	(43,480)	(44,877)
Other assets	(30,182)	(28,908)
Total assets	(76,153)	(76,416)
Liabilities and equity
Other current liabilities	(2,491)	(2,631)
Total current liabilities	(2,491)	(2,631)
Long-term debt	(30,182)	(28,908)
Total long-term liabilities	(30,182)	(28,908)
Commitments and contingencies
Total equity	(43,480)	(44,877)
Total liabilities and equity	$ (76,153)	$ (76,416)

Sum of the carrying amounts, as of the balance sheet date, of all current assets, less cash and cash equivalents, that are expected to be realized or consumed within one year (or the normal operating cycle, if longer). Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

No definition available.