SHAREHOLDERS' EQUITY - Preferred Shares Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	Jan. 17, 2020	Nov. 07, 2016	May 20, 2013
Series D 5.50% Preferred Shares
Class of Stock [Line Items]
Preferred shares, aggregate liquidation value issued			$ 225
Preferred shares, dividend rate			5.50%
Preferred shares, par value per share (in usd per share)			$ 0.0125
Preferred shares, liquidation preference per share (in usd per share)			25.00
Preferred shares, redemption price per share (in usd per share)			$ 25.00
Preferred shares, number of shares redeemed (in shares)	9,000,000
Preferred shares, aggregate liquidation value outstanding	$ 225
Series E 5.50% Preferred Shares
Class of Stock [Line Items]
Preferred shares, aggregate liquidation value issued		$ 550
Preferred shares, dividend rate		5.50%
Preferred shares, par value per share (in usd per share)		$ 0.0125
Preferred shares, liquidation preference per share (in usd per share)		2,500
Preferred shares, redemption price per share (in usd per share)		$ 2,500