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General Information (Unaudited) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Oil And Gas Property Unevaluated Property Costs Transferred To Full Cost Method     $ 3,100   $ 3,200  
Impairment of oil and gas properties $ 0 $ 291   $ 0 $ 4,078  
Foreign Pension Plan [Member]            
Defined Benefit Plan, Discount Rate       7.50%   8.25%
Defined Benefit Plan, Rate of Compensation Increase 4.00%     4.00%   8.00%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Return on Assets       7.75%    
Increase (Decrease) in Projected Benefit Obligation       $ (145)    
Defined Benefit Plan, Fair Value of Plan Assets, Period Increase (Decrease)       (21)    
Defined Benefit Plan, Recognized Net Gain (Loss) Due to Curtailments $ (4)          
Defined Benefit Plan, Funded Status of Plan 34     34    
Grasberg Segment [Member]            
Postemployment Benefits, Period Expense $ 83     $ 104