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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - ASSET IMPAIRMENTS (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Crude oil supply agreements termination costs $ 160 $ 160    
Asset impairments and related items   825 $ 10,239 $ 7,379
Libya        
Impairments of assets   61    
Oil and Gas | United States        
Impairments and related charges of exiting operations   (44) [1] 1,862 3,253
Impairments related to decline in commodity prices and changes in future development plans   15 1,428 1,381
Rig termination charges     192  
Other asset impairment related charges   5 204 119
Oil and Gas | Latin America        
Impairments related to decline in commodity prices   9 559 57
Oil and Gas | Middle East and North Africa        
Impairments of exiting operations   61 1,658 918
Impairments related to decline in commodity prices     2,833 91
Chemical        
Impairments of assets     121 149
Midstream and Marketing        
Other asset impairment related charges   160 216 40
Impairments of assets     814  
Corporate        
Severance, spin-off and allowance for doubtful accounts   541 125 13
Corporate | Joslyn oil sands project        
Impairments of assets       805
Corporate | California Resources Corporation        
Other-than-temporary impairment of investment   $ 78 $ 227 $ 553
[1] A portion of the 2015 charges are reported in the Midstream and Marketing segment.