INCOME TAXES - Total Provision for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Current income taxes:
Federal	$ (2)	$ 1	$ (1)
State	0	0	0
Foreign	178	659	895
Total current income taxes	176	660	894
Deferred income taxes:
Federal	0	67	(65)
State	0	0	2
Foreign	(112)	(53)	(159)
Total deferred income taxes	(112)	14	(222)
Total	$ 64	$ 674	$ 672