STOCKHOLDERS' EQUITY - Share Repurchases (Details) - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jul. 30, 2019	Nov. 28, 2018	Dec. 21, 2017	Dec. 14, 2017
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization				$ 3,000,000,000	$ 3,000,000,000.0	$ 3,000,000,000.0	$ 3,000,000,000
Cost of repurchases	$ 1,820,000,000	$ 1,070,000,000	$ 1,090,000,000
Excluding Employee Stock Plans and ASR
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)	3,800	3,400	3,070
Cost of repurchases	$ 1,750,000,000	$ 1,000,000,000	$ 1,024,000,000
December 2017 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization	$ 3,000,000,000
Shares repurchased (in shares)	0	0	3,070
Cost of repurchases	$ 0	$ 0	$ 1,024,000,000
July 2019 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization	$ 3,000,000,000
Shares repurchased (in shares)	3,800	3,400	0
Cost of repurchases	$ 1,750,000,000	$ 1,000,000,000	$ 0