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Debt - Components (Details) - USD ($)
$ in Millions
Jun. 30, 2016
Dec. 31, 2015
Short-term debt:    
Total short-term debt $ 1,302 $ 999
Long-term debt:    
Senior notes, net of unamortized discounts and debt issuance costs of $72 and $77, respectively 9,128 9,698
Noncurrent portion of other long-term debt 358 677
Total long-term debt 9,486 10,375
Total debt 10,788 11,374
Senior notes    
Long-term debt:    
Unamortized discounts and debt issuance costs 72 77
Senior notes, net of unamortized discounts and debt issuance costs of $72 and $77, respectively $ 9,128 9,698
5.88% senior notes due August 2016    
Debt    
Debt instrument, interest rate (as a percent) 5.88%  
Short-term debt:    
Current portion of long-term notes and other debt $ 175  
6.13% senior notes due January 2017    
Debt    
Debt instrument, interest rate (as a percent) 6.13%  
Short-term debt:    
Current portion of long-term notes and other debt $ 400  
Other    
Short-term debt:    
Current portion of long-term notes and other debt 3 3
Long-term debt:    
Noncurrent portion of other long-term debt 4 5
Commercial paper program    
Short-term debt:    
Short-term notes and borrowings $ 172 $ 696
Weighted average interest rate, short-term (as a percent) 1.30% 1.10%
Long-term debt:    
Noncurrent portion of other long-term debt $ 354 $ 672
Weighted average interest rate, long-term (as a percent) 1.30% 1.10%
Senior secured hedged inventory facility    
Short-term debt:    
Short-term notes and borrowings $ 552 $ 300
Weighted average interest rate, short-term (as a percent) 1.40% 1.40%