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Income Taxes (Deferred Tax Assets and Deferred Tax Liabilities) (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred Tax Liabilities:    
Differences between book and tax basis of property $ (2,364)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ (2,178)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Other taxable temporary differences (302)us-gaap_DeferredTaxLiabilitiesOther (337)us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liability (2,666)us-gaap_DeferredTaxLiabilities (2,515)us-gaap_DeferredTaxLiabilities
Deferred Tax Assets:    
Operating loss carryforwards 2,224us-gaap_DeferredTaxAssetsOperatingLossCarryforwards 2,108us-gaap_DeferredTaxAssetsOperatingLossCarryforwards
Capital loss carryforwards 137us-gaap_DeferredTaxAssetsCapitalLossCarryforwards 103us-gaap_DeferredTaxAssetsCapitalLossCarryforwards
Bad debt and other book provisions 221us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals 277us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccruals
Retirement costs 275us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits 291us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Tax credit carryforwards 58aes_DeferredTaxAssetsTaxCreditCarryforwardsGross 38aes_DeferredTaxAssetsTaxCreditCarryforwardsGross
Other deductible temporary differences 363us-gaap_DeferredTaxAssetsOther 420us-gaap_DeferredTaxAssetsOther
Total gross deferred tax asset 3,278us-gaap_DeferredTaxAssetsGross 3,237us-gaap_DeferredTaxAssetsGross
Less: valuation allowance (997)us-gaap_DeferredTaxAssetsValuationAllowance (1,090)us-gaap_DeferredTaxAssetsValuationAllowance
Total net deferred tax asset 2,281us-gaap_DeferredTaxAssetsNet 2,147us-gaap_DeferredTaxAssetsNet
Net deferred tax asset (liability) $ (385)us-gaap_DeferredTaxAssetsLiabilitiesNet $ (368)us-gaap_DeferredTaxAssetsLiabilitiesNet