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Debt - Components (Details) - USD ($)
$ in Millions
Mar. 31, 2016
Dec. 31, 2015
Short-term debt:    
Total short-term debt $ 715 $ 999
Long-term debt:    
Senior notes, net of unamortized discount and debt issuance costs of $74 and $77, respectively 9,126 9,698
Noncurrent portion of other long-term debt 27 677
Total long-term debt 9,153 10,375
Total debt 9,868 11,374
Senior notes    
Long-term debt:    
Unamortized discounts and debt issuance costs 74 77
Senior notes, net of unamortized discount and debt issuance costs of $74 and $77, respectively 9,126 9,698
5.88% senior notes due August 2016    
Short-term debt:    
Current portion of long-term notes and other debt $ 175  
Long-term debt:    
Debt instrument, interest rate (as a percent) 5.88%  
6.13% senior notes due January 2017    
Short-term debt:    
Current portion of long-term notes and other debt $ 400  
Long-term debt:    
Debt instrument, interest rate (as a percent) 6.13%  
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 $ 137 $ 696
Weighted average interest rate, short-term (as a percent) 0.90% 1.10%
Long-term debt:    
Noncurrent portion of other long-term debt $ 23 $ 672
Weighted average interest rate, long-term (as a percent) 0.90% 1.10%
Senior secured hedged inventory facility    
Short-term debt:    
Short-term notes and borrowings   $ 300
Weighted average interest rate, short-term (as a percent)   1.40%