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GUARANTOR FINANCIAL STATEMENTS (Condensed Consolidating Balance Sheet) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
ASSETS        
Assets, Current $ 9,303 $ 7,915    
Property, plant, equipment and mine development costs, net 29,818 29,584    
Total assets 42,144 40,809 $ 42,216  
LIABILITIES AND EQUITY        
Liabilities, Current 3,417 3,209    
Long-term debt, less current portion 9,677 9,821    
Environmental and asset retirement obligations, less current portion 3,705 3,630    
Other liabilities 2,269 2,491    
Total liabilities 23,476 23,361    
Equity:        
Stockholders’ equity 10,174 9,298    
Noncontrolling interests 8,494 8,150    
Total equity 18,668 17,448 $ 17,892 $ 11,296
Total liabilities and equity $ 42,144 $ 40,809