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Franchises, Goodwill and Other Intangible Assets Future Amortization Expense (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Nine months ending December 31, 2015 $ 201us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 236us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 202us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 168us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 132us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive  
Thereafter 201us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseAfterYearFive  
Net carrying amount $ 1,140us-gaap_FiniteLivedIntangibleAssetsNet $ 1,196us-gaap_FiniteLivedIntangibleAssetsNet