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Income Taxes (Schedule Of Income Tax Expense (Benefit)) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Current income tax expense (benefit):      
United States federal, current income tax expense (benefit) $ 152us-gaap_CurrentFederalTaxExpenseBenefit $ 73us-gaap_CurrentFederalTaxExpenseBenefit $ 60us-gaap_CurrentFederalTaxExpenseBenefit
Various states, current income tax expense (benefit) 18us-gaap_CurrentStateAndLocalTaxExpenseBenefit (5)us-gaap_CurrentStateAndLocalTaxExpenseBenefit (3)us-gaap_CurrentStateAndLocalTaxExpenseBenefit
Canada and various provinces, current income tax expense (benefit) 307us-gaap_CurrentForeignTaxExpenseBenefit 4us-gaap_CurrentForeignTaxExpenseBenefit (5)us-gaap_CurrentForeignTaxExpenseBenefit
Total current tax (benefit) expense 477us-gaap_CurrentIncomeTaxExpenseBenefit 72us-gaap_CurrentIncomeTaxExpenseBenefit 52us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit):      
United States federal, deferred income tax expense (benefit) 1,610us-gaap_DeferredFederalIncomeTaxExpenseBenefit 198us-gaap_DeferredFederalIncomeTaxExpenseBenefit (188)us-gaap_DeferredFederalIncomeTaxExpenseBenefit
Various states, deferred income tax expense (benefit) 93us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 59us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit 34us-gaap_DeferredStateAndLocalIncomeTaxExpenseBenefit
Canada and various provinces, deferred income tax expense (benefit) 188us-gaap_DeferredForeignIncomeTaxExpenseBenefit (160)us-gaap_DeferredForeignIncomeTaxExpenseBenefit (30)us-gaap_DeferredForeignIncomeTaxExpenseBenefit
Total deferred tax expense (benefit) 1,891us-gaap_DeferredIncomeTaxExpenseBenefit 97us-gaap_DeferredIncomeTaxExpenseBenefit (184)us-gaap_DeferredIncomeTaxExpenseBenefit
Total income tax expense (benefit) $ 2,368us-gaap_IncomeTaxExpenseBenefit $ 169us-gaap_IncomeTaxExpenseBenefit $ (132)us-gaap_IncomeTaxExpenseBenefit