EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2019	Dec. 31, 2018	Jul. 31, 2019
Statement [Line Items]
Common stock, authorized shares		200,000,000	200,000,000
Preferred stock, authorized shares		20,000,000	20,000,000
Common stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, par value (in dollars per share)		$ 0.01	$ 0.01
Preferred stock, outstanding shares		0	0
Common stock issuances
Balance at the beginning of the year (in shares)	48,650,420	48,650,420
Balance at the end of the year (in shares)		49,175,843	48,650,420
Accumulated Other Comprehensive Income (Loss)
Pension and post-retirement adjustments		$ 23	$ 6
Common Stock
Common stock issuances
Balance at the beginning of the year (in shares)	48,650,000	48,650,000	42,902,000
Common stock shares issued (in shares)		694,000	6,110,000
Common stock shares canceled (in shares)		(168,000)	(362,000)
Balance at the end of the year (in shares)		49,176,000	48,650,000
Colony Capital, Inc.
Statement [Line Items]
Warrant outstanding (in shares)		200,000		1,250,000
Warrant exercise price (in dollars per share)				$ 40
Term of tranche	5 years	5 years
Ares JV | Ares-led investor group
Common stock issuances
Common stock shares issued (in shares)			2,300,000