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RECLAMATION AND REMEDIATION - Reconciliation of Obligation (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Change in reclamation liability          
Balance at beginning of period       $ 2,316 $ 2,144
Additions, changes in estimates and other       18 6
Payments, net       (28) (22)
Accretion expense   $ 38 $ 26 96 75
Balance at end of period $ 2,203 3,134 2,203 3,134 2,203
Change in remediation liability          
Balance at beginning of period       279 304
Additions, changes in estimates and other       37 6
Payments, net       (36) (29)
Accretion expense   1 2 6 4
Balance at end of period 285 $ 466 $ 285 466 $ 285
Con Mine          
Change in remediation liability          
Additions, changes in estimates and other       11  
Idarado Site [Member]          
Change in remediation liability          
Additions, changes in estimates and other $ 8        
Individually Immaterial Disposals [Member]          
Change in reclamation liability          
Acquisitions and divestitures       (10)  
Goldcorp [Member]          
Change in reclamation liability          
Acquisitions and divestitures       768  
Change in remediation liability          
Acquisitions and divestitures       180  
Nevada Gold Mines LLC NGM [Member]          
Change in reclamation liability          
Acquisitions and divestitures       (26)  
Dawn Mine [Member]          
Change in remediation liability          
Additions, changes in estimates and other       26  
Mule Canyon Mine [Member]          
Change in reclamation liability          
Additions, changes in estimates and other       9  
Northumberland Mine [Member]          
Change in reclamation liability          
Additions, changes in estimates and other       $ 4