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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current Income Tax Expense [Abstract]      
Federal $ 136us-gaap_CurrentFederalTaxExpenseBenefit $ 201us-gaap_CurrentFederalTaxExpenseBenefit $ 160us-gaap_CurrentFederalTaxExpenseBenefit
State 19us-gaap_CurrentStateAndLocalTaxExpenseBenefit 20us-gaap_CurrentStateAndLocalTaxExpenseBenefit 22us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Total current expense 155us-gaap_CurrentIncomeTaxExpenseBenefit 221us-gaap_CurrentIncomeTaxExpenseBenefit 182us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred Income Tax Expense (Benefit) [Abstract]      
Federal (24)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (75)us-gaap_DeferredFederalIncomeTaxExpenseBenefit (69)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Total deferred benefit (24)us-gaap_DeferredIncomeTaxExpenseBenefit (75)us-gaap_DeferredIncomeTaxExpenseBenefit (69)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense 131us-gaap_IncomeTaxExpenseBenefit 146us-gaap_IncomeTaxExpenseBenefit 113us-gaap_IncomeTaxExpenseBenefit
Income Tax Reconciliation [Abstract]      
Income before income taxes 383us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 415us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest 392us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Federal statutory income tax rate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Expected federal income tax expense 134us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 145us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate 137us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Increase (decrease) in tax expense resulting from:      
State income tax expense, net of federal income tax 12us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 13us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 14us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Amortization of investment tax credit 0us-gaap_IncomeTaxReconciliationTaxCreditsInvestment 0us-gaap_IncomeTaxReconciliationTaxCreditsInvestment (1)us-gaap_IncomeTaxReconciliationTaxCreditsInvestment
Decrease in settled and uncertain tax positions 0cehe_IncomeTaxReconciliationTaxSettlementsAndUncertainIncomeTaxPositions (5)cehe_IncomeTaxReconciliationTaxSettlementsAndUncertainIncomeTaxPositions (26)cehe_IncomeTaxReconciliationTaxSettlementsAndUncertainIncomeTaxPositions
Other, net (15)us-gaap_IncomeTaxReconciliationOtherReconcilingItems (7)us-gaap_IncomeTaxReconciliationOtherReconcilingItems (11)us-gaap_IncomeTaxReconciliationOtherReconcilingItems
Total (3)cehe_IncomeTaxReconciliationChangeInTaxExpense 1cehe_IncomeTaxReconciliationChangeInTaxExpense (24)cehe_IncomeTaxReconciliationChangeInTaxExpense
Total income tax expense 131us-gaap_IncomeTaxExpenseBenefit 146us-gaap_IncomeTaxExpenseBenefit 113us-gaap_IncomeTaxExpenseBenefit
Effective tax rate 34.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 35.20%us-gaap_EffectiveIncomeTaxRateContinuingOperations 28.80%us-gaap_EffectiveIncomeTaxRateContinuingOperations
Tax benefits recognized (6)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions (5)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions (26)us-gaap_TaxAdjustmentsSettlementsAndUnusualProvisions
Deferred Tax Assets and Liabilities [Abstract]      
Allowance for doubtful accounts 1us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts 1us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts  
Other 1cehe_DeferredTaxAssetsCurrentOther 2cehe_DeferredTaxAssetsCurrentOther  
Total current deferred tax assets 2us-gaap_DeferredTaxAssetsGrossCurrent 3us-gaap_DeferredTaxAssetsGrossCurrent  
Employee benefits 92us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits 80us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits  
Other 19cehe_DeferredTaxAssetsNoncurrentOther 17cehe_DeferredTaxAssetsNoncurrentOther  
Total non-current deferred tax assets 111us-gaap_DeferredTaxAssetsGrossNoncurrent 97us-gaap_DeferredTaxAssetsGrossNoncurrent  
Total deferred tax assets 113us-gaap_DeferredTaxAssetsGross 100us-gaap_DeferredTaxAssetsGross  
Depreciation (1) 1,284cehe_DeferredTaxLiabilitiesDepreciation [1] 1,163cehe_DeferredTaxLiabilitiesDepreciation [1]  
Regulatory assets, net (1) 828us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities [1] 954us-gaap_DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities [1]  
Total deferred tax liabilities (1) 2,112us-gaap_DeferredIncomeTaxLiabilities [1] 2,117us-gaap_DeferredIncomeTaxLiabilities [1]  
Accumulated deferred income taxes, net (1) 1,999us-gaap_DeferredTaxLiabilities [1] 2,017us-gaap_DeferredTaxLiabilities [1]  
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Unrecognized Tax Benefits, beginning of year 0us-gaap_UnrecognizedTaxBenefits 0us-gaap_UnrecognizedTaxBenefits 44us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits related to prior years [Abstract]      
Reductions 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions 0us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions (46)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
Unrecognized Tax Benefits Current Year Tax Positions Abstract      
Unrecognized Tax Benefits, Increase Resulting from Settlements with Taxing Authorities 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities 0us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities 2us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromSettlementsWithTaxingAuthorities
Unrecognized Tax Benefits, end of year $ 0us-gaap_UnrecognizedTaxBenefits $ 0us-gaap_UnrecognizedTaxBenefits $ 0us-gaap_UnrecognizedTaxBenefits
[1] For tax year ended December 31, 2013, the amounts are presented after the effect of the revisions to the prior period financial statement discussed in Note 2(n).