Quarterly report pursuant to Section 13 or 15(d)

Intangible Assets (Details)

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Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]    
Amortization of Intangible Assets $ 32us-gaap_AmortizationOfIntangibleAssets $ 36us-gaap_AmortizationOfIntangibleAssets
Remainder of 2015 103us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseRemainderOfFiscalYear  
2016 159us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo  
2017 118us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearThree  
2018 106us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFour  
2019 $ 96us-gaap_FiniteLivedIntangibleAssetsAmortizationExpenseYearFive