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OTHER LIABILITIES, INCLUDING EMPLOYEE BENEFITS (Defined Contribution Plan) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Defined Contribution Plan Disclosure [Line Items]      
Liabilities $ 28,060 $ 33,769  
Accounts payable and accrued liabilities 2,393 3,232  
Other liabilities 1,745 1,641  
Costs charged to operations for employee savings plans and defined contribution plans 78 98 $ 79
Costs capitalized to oil and gas properties for employee savings plans and defined benefit contribution plans 4 13 $ 11
401K Plan      
Defined Contribution Plan Disclosure [Line Items]      
Liabilities $ 47 78  
Accounts payable and accrued liabilities   35  
Other liabilities   $ 43