STOCKHOLDERS' EQUITY - Treasury Stock Narrative (Details) - USD ($) $ in Millions	6 Months Ended
Jun. 30, 2021	Jun. 30, 2020
Equity [Abstract]
Repurchase of common stock	$ 95	$ 270
Treasury stock purchased (in shares)	2,244,924

Number of shares that have been repurchased during the period and are being held in treasury.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration