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STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($) shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2016
Class of Stock [Line Items]
Shares repurchased and retired (in shares)	4.8	18.7
Value of shares repurchased and retired	$ 309,000,000	$ 1,300,000,000
Remaining authorized repurchase amount under stock repurchase programs	$ 6,500,000,000
2016 Stock Repurchase Program
Class of Stock [Line Items]
Authorized amount under stock repurchase program			$ 12,000,000,000.0
2020 Stock Repurchase Program
Class of Stock [Line Items]
Authorized amount under stock repurchase program		$ 5,000,000,000.0

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