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Credit Facilities and Debt (Summary of Debt Outstanding) (Details) - USD ($)
$ in Millions
Mar. 31, 2017
Dec. 31, 2016
Credit Facilities and Long-Term Debt :    
Debt issuance costs and unamortized discount $ (24) $ (24)
Long-term debt 2,126 2,108
Total debt 2,387 2,368
Commercial Paper, at Carrying Value 60 65
Short-term borrowings and current maturities of long-term debt 261 260
Senior Notes Due 2021, 4.875%    
Credit Facilities and Long-Term Debt :    
Senior Notes Due [1] 600 600
Senior Notes Due 2023, 2.250%    
Credit Facilities and Long-Term Debt :    
Senior Notes Due [1] 537 522
Senior Notes due 2026    
Credit Facilities and Long-Term Debt :    
Senior Notes Due 500 500
Senior Notes due 2046    
Credit Facilities and Long-Term Debt :    
Senior Notes Due 400 400
Commercial Paper [Member]    
Credit Facilities and Long-Term Debt :    
Senior Notes Due   65
Research and Development Facility Contract [Member]    
Credit Facilities and Long-Term Debt :    
Senior Notes Due 113 110
Term Loan [Member]    
Credit Facilities and Long-Term Debt :    
Senior Notes Due 161 157
Risk Sharing Finance Facility Agreement    
Credit Facilities and Long-Term Debt :    
Research and development facility agreement $ 40 $ 38
[1] The fair value of our Senior Notes was determined using quoted prices in active markets for identical securities, which are considered Level 1 inputs. The fair value of our Senior Notes due 2021 was $652 million and $651 million as of March 31, 2017 and December 31, 2016, respectively. The fair value of our Senior Notes due 2023 was $575 million and $555 million as of March 31, 2017 and December 31, 2016, respectively. The fair value of our Senior Notes due 2026 was $494 million and $487 million as of March 31, 2017 and December 31, 2016, respectively.The fair value of our Senior Notes due 2046 was $398 million and $397 million as of March 31, 2017 and December 31, 2016, respectively.