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Provision for Income Taxes Deferred Tax Table (Details) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Deferred tax liabilities:    
Property, plant, and equipment $ 4us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment $ 102us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Undistributed earnings of foreign subsidiaries 0us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings 75us-gaap_DeferredTaxLiabilitiesUndistributedForeignEarnings
Investments 5,472us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates 3,663us-gaap_DeferredTaxLiabilitiesInvestmentInNoncontrolledAffiliates
Other 10us-gaap_DeferredTaxLiabilitiesOther 0us-gaap_DeferredTaxLiabilitiesOther
Total deferred tax liabilities 5,486us-gaap_DeferredIncomeTaxLiabilities 3,840us-gaap_DeferredIncomeTaxLiabilities
Deferred tax assets:    
Accrued liabilities 178us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities 126us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Minimum tax credits 137us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax 66us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax
Foreign tax credit 251us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign 42us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsForeign
Federal loss carryovers 134us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic 0us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
State losses and credits 250us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal 194us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
Other 97us-gaap_DeferredTaxAssetsOther 91us-gaap_DeferredTaxAssetsOther
Total deferred tax assets 1,047us-gaap_DeferredTaxAssetsGross 519us-gaap_DeferredTaxAssetsGross
Less valuation allowance 206us-gaap_DeferredTaxAssetsValuationAllowance 181us-gaap_DeferredTaxAssetsValuationAllowance
Net deferred tax assets 841us-gaap_DeferredTaxAssetsNet 338us-gaap_DeferredTaxAssetsNet
Overall net deferred tax liabilities $ 4,645us-gaap_DeferredTaxLiabilities $ 3,502us-gaap_DeferredTaxLiabilities