SPECIAL ITEMS Other Special Items (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other Special Items [Line Items]
Special items—other	$ 0	$ 0	$ 45
Settlement Fee [Member]
Other Special Items [Line Items]
Special items—other	20
One-time Bonus Payment [Member]
Other Special Items [Line Items]
Special items—other	$ 25