CAPITAL STOCK - Additional Information (Details) $ / shares in Units, $ in Millions	1 Months Ended	2 Months Ended	3 Months Ended		94 Months Ended
	Mar. 31, 2020 $ / shares	Mar. 12, 2020 $ / shares	Mar. 31, 2021 USD ($) $ / shares shares	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2021 $ / shares shares	Dec. 31, 2018 shares	Dec. 31, 2014 shares	Dec. 31, 2013 shares
Equity [Abstract]
Common stock, conversion ratio			1		1
Options and restricted stock, anti-dilutive (in shares)			4,000,000.0	5,500,000
Common stock share purchase, shares (in shares)						40,000,000	40,000,000	40,000,000
Treasury shares acquired (in shares)			0		40,000,000
Treasure stock acquired, average price (in USD per share) | $ / shares					$ 79.18
Payments of dividend on common stock | $			$ 9	$ 94
Common stock, dividends, per share (in USD per share) | $ / shares	$ 0.025	$ 0.25	$ 0.025	$ 0.025