INCOME TAXES (Provision for (benefit from) income taxes) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	$ 23	$ (46)	$ 3
State	(3)	(1)	10
Foreign	462	1,445	1,426
Total current	482	1,398	1,439
Deferred income taxes:
Federal	(48)	106	(64)
State	(8)	8	(10)
Foreign	101	102	(89)
Total deferred	45	216	(163)
Adjustments	(12)	(504)	(393)
Operating loss carryforwards	(5)	(119)	0
Provision for income taxes	510	991	883
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	(123)	(393)
Federal Income Tax Expense (Benefit), Continuing Operations		22
Tax Cuts and Jobs Act of 2017, deferred tax assets, existing income tax expense (benefit)			272
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	121
Minimum Tax Credit Carryforwards [Member]
Deferred income taxes:
Federal Income Tax Expense (Benefit), Continuing Operations		76	$ 438
Foreign Income Tax Expense (Benefit), Continuing Operations		$ 47
Timok, Lower Zone [Member]
Current Income Tax Expense (Benefit), Continuing Operations [Abstract]
Federal	$ 53