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INCOME TAXES (Provision for (benefit from) income taxes) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal $ (53) $ 23 $ (46)
State 1 (3) (1)
Foreign 816 462 1,445
Total current 764 482 1,398
Deferred income taxes:      
Federal (3) (48) 106
State (5) (8) 8
Foreign 306 101 102
Total deferred 298 45 216
Adjustments (37) (12) (504)
Operating loss carryforwards (81) (5) (119)
Provision for income taxes 944 510 991
Tax Cuts and Jobs Act of 2017, change in tax rate, provisional income tax expense (benefit)     29
Tax Cuts and Jobs Act of 2017, provisional income tax expense (benefit) 0 0 (123)
Reserve for Taxes, Other than Income Taxes [Member]      
Deferred income taxes:      
Tax Cuts and Jobs Act of 2017, provisional income tax expense (benefit)   29  
Alternative Minimum Tax Credit      
Deferred income taxes:      
Tax Cuts and Jobs Act of 2017, provisional income tax expense (benefit)     123
Minimum Tax Credit Carryforwards [Member]      
Deferred income taxes:      
Federal Income Tax Expense (Benefit), Continuing Operations     76
Foreign Income Tax Expense (Benefit), Continuing Operations     $ 47
Timok, Lower Zone [Member]      
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]      
Federal $ (53) $ 53