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Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Short-term debt:    
Commercial paper notes, bearing a weighted-average interest rate of 0.43% and 0.46%, respectively $ 678 $ 734
Other short-term debt 3 3
Total short-term debt 681 1,287
Long-term debt:    
Senior notes, net of unamortized discount of $18 and $18, respectively 9,757 8,757
Unamortized discount 18 18
Commercial paper notes, bearing a weighted-average interest rate of 0.43% 208  
Other long-term debt 5 5
Total long-term debt 9,970 8,762
Total debt $ 10,651 $ 10,049
Commercial paper program    
Short-term debt:    
Weighted average interest rate, short-term (as a percent) 0.43% 0.46%
Long-term debt:    
Weighted average interest rate, long-term (as a percent) 0.43%  
5.25% senior notes due June 2015    
Debt    
Debt instrument, interest rate (as a percent)   5.25%
Short-term debt:    
Senior Notes, Current   $ 150
3.95% senior notes due September 2015    
Debt    
Debt instrument, interest rate (as a percent)   3.95%
Short-term debt:    
Senior Notes, Current   $ 400
5.88% senior notes due August 2016    
Debt    
Debt instrument, interest rate (as a percent) 5.88%  
Long-term debt:    
Senior Notes, Noncurrent $ 175