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Debt - Components (Details) - USD ($)
$ in Millions
Sep. 30, 2016
Dec. 31, 2015
Short-term debt:    
Total short-term debt $ 1,384 $ 999
Long-term debt:    
Senior notes, net of unamortized discounts and debt issuance costs of $70 and $77, respectively 9,130 9,698
Other long-term debt 504 677
Total long-term debt 9,634 10,375
Total debt 11,018 11,374
Senior notes    
Long-term debt:    
Unamortized discounts and debt issuance costs 70 77
Senior notes, net of unamortized discounts and debt issuance costs of $70 and $77, respectively 9,130 9,698
Other    
Long-term debt:    
Other long-term debt $ 4 $ 5
Commercial paper notes    
Long-term debt:    
Weighted average interest rate, long-term 1.30% 1.10%
Other long-term debt $ 500 $ 672
Commercial paper notes    
Short-term debt:    
Weighted average interest rate, short-term 1.30% 1.10%
Short-term debt $ 256 $ 696
Other    
Short-term debt:    
Other short-term debt $ 3 $ 3
Senior secured hedged inventory facility | Credit facility    
Short-term debt:    
Weighted average interest rate, short-term 1.50% 1.40%
Short-term debt $ 725 $ 300
6.13% senior notes due January 2017 | Senior notes    
Short-term debt:    
Debt instrument, interest rate 6.13%  
Senior notes, current $ 400