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- Reconciliation of Deferred Taxes to Deferred Taxes Shown In Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Disclosure Reconciliation Of Deferred Taxes To Deferred Taxes Shown In Balance Sheet [Abstract]      
Reducing in Tax Loss Carryforward Due To Realization Foreign Tax Loss $ 12ten_ReducinginTaxLossCarryforwardDueToRealizationForeignTaxLoss $ 6ten_ReducinginTaxLossCarryforwardDueToRealizationForeignTaxLoss  
Valuation allowance 139us-gaap_DeferredTaxAssetsValuationAllowance 135us-gaap_DeferredTaxAssetsValuationAllowance  
Balance Sheet:      
Current portion - deferred tax asset 81us-gaap_DeferredTaxAssetsNetCurrent 71us-gaap_DeferredTaxAssetsNetCurrent  
Non-current portion - deferred tax asset 143us-gaap_DeferredTaxAssetsNetNoncurrent 125us-gaap_DeferredTaxAssetsNetNoncurrent  
Current portion - deferred tax liability shown in other current liabilities (4)us-gaap_DeferredTaxLiabilitiesCurrent (3)us-gaap_DeferredTaxLiabilitiesCurrent  
Non-current portion - deferred tax liability (18)us-gaap_DeferredTaxLiabilitiesNoncurrent (28)us-gaap_DeferredTaxLiabilitiesNoncurrent  
Net deferred tax assets 202us-gaap_DeferredTaxAssetsLiabilitiesNet 165us-gaap_DeferredTaxAssetsLiabilitiesNet  
Income tax expense 131us-gaap_IncomeTaxExpenseBenefit 122us-gaap_IncomeTaxExpenseBenefit 19us-gaap_IncomeTaxExpenseBenefit
Impact on earnings related to reversal of valuation allowance $ 11ten_ImpactOnEarningsRelatedToReversalOfValuationAllowance