CAPITAL STOCK - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended		6 Months Ended		85 Months Ended
	Mar. 31, 2020	Mar. 12, 2020	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2018	Dec. 31, 2014
Equity [Abstract]
Options and restricted stock, anti-dilutive (in shares)			5,200,000	5,000,000.0	5,400,000	5,300,000
Payments of dividend on common stock			$ 10	$ 94	$ 104	$ 188
Common stock, dividends, per share (in USD per share)	$ 0.025	$ 0.25	$ 0.025	$ 0.25	$ 0.05	$ 0.50
Number of shares authorized to be repurchased (in shares)								40,000,000	40,000,000
Number of shares repurchased during period (in shares)					0		40,000,000
Average price of shares repurchased during period (in USD per share)							$ 79.18