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Industry Segments (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
segment
Segment Information        
Number of operating segments | segment     3 3
Net sales $ 4,083 $ 3,060 $ 7,846 $ 6,017
Pre-tax operating profit (loss) 1,150 792 2,197 987
Income taxes (302) (285) (641) (363)
Net income (loss) 848 507 1,556 624
Gain on sale of assets 10 512 43 512
Operating segments | Oil and Gas        
Segment Information        
Net sales 2,531 1,848 4,985 3,742
Pre-tax operating profit (loss) 780 627 1,530 847
Net income (loss) 780 627 1,530 847
Operating segments | Chemical        
Segment Information        
Net sales 1,176 1,156 2,330 2,224
Pre-tax operating profit (loss) 317 230 615 400
Net income (loss) 317 230 615 400
Operating segments | Midstream and Marketing        
Segment Information        
Net sales 603 270 992 481
Pre-tax operating profit (loss) 250 119 429 72
Net income (loss) 250 119 429 72
Operating segments | Midstream and Marketing | Equity investment        
Segment Information        
Non-cash fair value gain   94   94
Corporate and Eliminations        
Segment Information        
Net sales (227) (214) (461) (430)
Pre-tax operating profit (loss) (197) (184) (377) (332)
Income taxes (302) (285) (641) (363)
Net income (loss) $ (499) (469) $ (1,018) (695)
South Texas operations | Domestic oil and gas assets        
Segment Information        
Gain on sale of assets   $ 510   $ 510