STOCKHOLDERS' EQUITY - Treasury Stock Schedule (Details) - USD ($) shares in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 14, 2017	Feb. 14, 2017
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization				$ 3,000,000,000.0	$ 2,250,000,000.00
Value of shares repurchased	$ 1,090,000,000	$ 3,365,000,000	$ 104,000,000
February 2017 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization	$ 2,250,000,000
Shares repurchased in open market (in shares)	0	9,710	0
Value of shares repurchased	$ 0	$ 2,250,000,000	$ 0
December 2017 Authorization
Equity, Class of Treasury Stock [Line Items]
Share repurchase authorization	$ 3,000,000,000
Shares repurchased in open market (in shares)	3,070	3,280	0
Value of shares repurchased	$ 1,024,000,000	$ 800,000,000	$ 0
Excluding Employee Stock Plans and ASR
Equity, Class of Treasury Stock [Line Items]
Shares repurchased in open market (in shares)	3,070	12,990	0
Value of shares repurchased	$ 1,024,000,000	$ 3,050,000,000	$ 0