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STOCKHOLDERS' EQUITY - Additional Information (Details) - USD ($) shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Mar. 31, 2020	Mar. 31, 2016
Class of Stock [Line Items]
Shares repurchased and retired (in shares)	2.1	3.0	7.5	22.4
Value of shares repurchased and retired	$ 145,000,000	$ 201,000,000	$ 497,000,000	$ 1,600,000,000
Remaining authorized repurchase amount under stock repurchase programs	$ 6,300,000,000		$ 6,300,000,000
2016 Stock Repurchase Program
Class of Stock [Line Items]
Authorized amount under stock repurchase program						$ 12,000,000,000
2020 Stock Repurchase Program
Class of Stock [Line Items]
Authorized amount under stock repurchase program					$ 5,000,000,000

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