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Debt (Schedule of Debt) (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
May 26, 2015
Debt Instrument [Line Items]      
Total debt $ 3,779 $ 3,611  
Less: short-term debt including current maturities 309 143  
Long-term debt 3,470 3,468  
Senior notes | 5.9% Senior Notes, due 2017      
Debt Instrument [Line Items]      
Long-term debt $ 400 399  
Interest rate 5.90%    
Unamortized debt discount and issuance costs $ 1    
Senior notes | 2.5% Senior Notes, due 2018      
Debt Instrument [Line Items]      
Long-term debt $ 398 398  
Interest rate 2.50%    
Unamortized debt discount and issuance costs $ 2    
Senior notes | 3.3% Senior Notes, due 2020      
Debt Instrument [Line Items]      
Long-term debt $ 695 695  
Interest rate 3.30%    
Unamortized debt discount and issuance costs $ 5    
Senior notes | 4.0% Senior Notes, due 2025      
Debt Instrument [Line Items]      
Long-term debt $ 690 690  
Interest rate 4.00%   4.00%
Unamortized debt discount and issuance costs $ 10    
Senior notes | 4.4% Senior Notes, due 2026      
Debt Instrument [Line Items]      
Long-term debt $ 891 890  
Interest rate 4.40%    
Unamortized debt discount and issuance costs $ 9    
Senior notes | 6.55% Senior Notes, due 2037      
Debt Instrument [Line Items]      
Long-term debt $ 396 $ 396  
Interest rate 6.55%    
Unamortized debt discount and issuance costs $ 4