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CAPITAL STOCK - Narrative (Details) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jan. 31, 2018	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 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	22,900,000	0	22,900,000
Aggregate cost of shares repurchased					$ 143,300,000
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)		45,500,000	0	45,500,000	0
Proceeds from sale of stock		$ 420,400,000		$ 420,400,000

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