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Income Taxes (Effective Income Tax Rate) (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]        
Impairment of Long-Lived Assets Held-for-use $ 352us-gaap_ImpairmentOfLongLivedAssetsHeldForUse $ 495us-gaap_ImpairmentOfLongLivedAssetsHeldForUse $ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse $ 0us-gaap_ImpairmentOfLongLivedAssetsHeldForUse
Statutory income tax rate   7.83%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 7.83%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 7.83%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Income tax benefit (provision)   $ (284)us-gaap_IncomeTaxExpenseBenefit $ (144)us-gaap_IncomeTaxExpenseBenefit $ (462)us-gaap_IncomeTaxExpenseBenefit