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Additional Information (Schedule of Additional Information) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Research and development expense $ 167us-gaap_ResearchAndDevelopmentExpense $ 153us-gaap_ResearchAndDevelopmentExpense $ 136us-gaap_ResearchAndDevelopmentExpense
Advertising expense 30us-gaap_AdvertisingExpense 7us-gaap_AdvertisingExpense 6us-gaap_AdvertisingExpense
Interest expense 857us-gaap_InterestExpense 1,053us-gaap_InterestExpense 1,128us-gaap_InterestExpense
Interest income (49)us-gaap_InterestIncomeOther (4)us-gaap_InterestIncomeOther (2)us-gaap_InterestIncomeOther
Interest expense (income), net 808us-gaap_InterestIncomeExpenseNet 1,049us-gaap_InterestIncomeExpenseNet 1,126us-gaap_InterestIncomeExpenseNet
Rent expense $ 52us-gaap_LeaseAndRentalExpense $ 49us-gaap_LeaseAndRentalExpense $ 49us-gaap_LeaseAndRentalExpense