EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended
	Sep. 23, 2019	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Income available for common shareholders		$ 371	$ 136
Weighted average common shares outstanding, basic (in shares)		529,000,000	526,000,000
Add incremental shares from assumed conversions:
Employee share-based compensation (in shares)		0	1,000,000
Chapter 11-realted settlements		119,000,000	0
Weighted average common shares outstanding, diluted (in shares)		648,000,000	527,000,000
Total income per common share, diluted (in dollars per share)		$ 0.57	$ 0.25
Equity raise	$ 9,000
Backstop commitment premium, common stock, shares		119,000,000.0
Backstop commitment premium, common stock, additional share cap (in shares)		19,909,091