CAPITAL STOCK - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Jan. 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Jun. 30, 2019
Class of Stock [Line Items]
Authorized amount of stock available for repurchase (up to)						$ 1,500,000,000	$ 1,500,000,000
Shares repurchased (in shares)		0	4,800,000	0	27,700,000
Aggregate cost of shares repurchased			$ 31,300,000		$ 174,700,000
Preferred stock, par value (USD per share)		$ 0.01		$ 0.01		$ 0.01
Preferred stock, redemption price (in dollars per share)		$ 25.00		$ 25.00
At-the-market Sale Program
Class of Stock [Line Items]
Aggregate stock offering price (up to)	$ 1,500,000,000
Sale of stock, shares issued (in shares)		5,600,000	0	51,100,000	0
Proceeds from sale of stock		$ 49,000,000		$ 469,500,000