CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY (Parenthetical) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Standards Update	us-gaap:AccountingStandardsUpdate201613Member	us-gaap:AccountingStandardsUpdate201602Member	us-gaap:AccountingStandardsUpdate201409Member
RETAINED EARNINGS (ACCUMULATED DEFICIT)
Cumulative effect of new accounting principle in period of adoption, tax	$ (1)		$ (49)