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COMMITMENTS AND GUARANTEES (Contractual Obligations) (Details)
$ in Millions
Dec. 31, 2019
USD ($)
Unconditional purchase obligations [Line Items]  
Unconditional purchase obligations $ 3,600
2019 1,600
2020 731
2021 300
2022 274
2023 270
Thereafter 387
Copper concentrates  
Unconditional purchase obligations [Line Items]  
Unconditional purchase obligations 2,300
Cobalt  
Unconditional purchase obligations [Line Items]  
Unconditional purchase obligations 470
Electricity  
Unconditional purchase obligations [Line Items]  
Unconditional purchase obligations 382
Transportation  
Unconditional purchase obligations [Line Items]  
Unconditional purchase obligations $ 268