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General Information (Unaudited) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 9 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Sep. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Mar. 31, 2016
Jun. 30, 2017
Sep. 30, 2017
Sep. 30, 2016
Oil And Gas Property Unevaluated Property Costs Transferred To Full Cost Method           $ 3,100     $ 3,200
Impairment of oil and gas properties     $ 0   $ 239     $ 0 $ 4,317
Grasberg Segment [Member]                  
Postemployment Benefits, Period Expense     9         113  
Foreign Plan [Member]                  
Defined Benefit Plan, Discount Rate 7.50% 8.25%              
Defined Benefit Plan, Rate of Compensation Increase 4.00% 8.00%   4.00%     4.00%    
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Long-term Rate of Return on Plan Assets 7.75%                
Increase (Decrease) in Projected Benefit Obligation             $ (145)    
Defined Benefit Plan, Plan Assets, Period Increase (Decrease)             $ (21)    
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Curtailment       $ 4       4  
Defined Benefit Plan, Funded (Unfunded) Status of Plan   $ (90) $ 36         $ 36