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INCOME AND MINING TAXES - Tax Rate Reconciliation (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Reconciling item, percentage      
U.S. Federal statutory tax rate (as a percent) 21.00% 21.00% 35.00%
Re-measurement due to the Tax Cuts and Jobs Act (as a percent)   (2.00%) 29.00%
Tax Restructuring related to the Tax Cuts and Jobs Act (as a percent)   (4.00%) 38.00%
Percentage depletion (as a percent) (1.00%) (7.00%) (8.00%)
Change in valuation allowance on deferred tax assets (as a percent) (8.00%) 24.00% 7.00%
Rate differential for foreign earnings indefinitely reinvested (as a percent) 4.00% 15.00%  
Mining and other taxes (as a percent) 3.00% 9.00% 4.00%
Uncertain tax position reserve adjustment (as a percent) 2.00% (5.00%)  
U.S. tax effect of noncontrolling interest attributable to non-U.S. investees (1.00%) (4.00%)  
Effect of foreign earnings, net of credits (as a percent) (2.00%) (2.00%)  
Tax impact of foreign exchange (as a percent) (3.00%)    
Other (as a percent) 4.00% 3.00%  
Income and mining tax expense (as a percent) 23.00% 52.00% 105.00%
Reconciling item, amount      
Income (loss) before income and mining tax and other items $ 3,693 $ 738 $ 1,072
Tax at statutory rate (776) (155) (375)
Re-measurement due to the Tax Cuts and Jobs Act   14 (312)
Tax restructuring related to the Tax Cuts and Jobs Act   34 (394)
Percentage depletion 55 49 81
Change in valuation allowance on deferred tax assets 296 (175) (80)
Rate differential for foreign earnings indefinitely reinvested (140) (111)  
Mining and other taxes (90) (63) (41)
Uncertain tax position reserve adjustment (70) 34 (4)
U.S. tax effect of noncontrolling interest attributable to non-U.S. investees 28 26 (1)
Effect of foreign earnings, net of credits (73) (18) (4)
Tax impact of foreign exchange 96    
Other (158) (21) 3
Income and mining tax benefit (expense) $ (832) $ (386) $ (1,127)