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Industry Segments (Details)
$ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
segment
Mar. 31, 2018
USD ($)
Segment Information    
Number of operating segments | segment 3  
Net sales $ 4,004 $ 3,763
Pre-tax operating profit (loss) 856 1,047
Income taxes (225) (339)
Net income (loss) 631 708
Operating segments | Oil and Gas    
Segment Information    
Net sales 2,351 2,454
Pre-tax operating profit (loss) 484 750
Income taxes 0 0
Net income (loss) 484 750
Operating segments | Chemical    
Segment Information    
Net sales 1,059 1,154
Pre-tax operating profit (loss) 265 298
Income taxes 0 0
Net income (loss) 265 298
Operating segments | Midstream and Marketing    
Segment Information    
Net sales 816 389
Pre-tax operating profit (loss) 279 179
Income taxes 0 0
Net income (loss) 279 179
Corporate and Eliminations    
Segment Information    
Net sales (222) (234)
Pre-tax operating profit (loss) (172) (180)
Income taxes (225) (339)
Net income (loss) $ (397) $ (519)