SHAREHOLDERS' EQUITY - Summary of Stock Repurchase Activity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Stock Repurchase [Roll Forward]
Number of shares repurchased (in shares)	33,438,176
Cost of Shares Repurchased	$ 82	$ 106
Number of shares repurchased (in shares)	34,196,625
Treasury Stock
Stock Repurchase [Roll Forward]
Number of shares repurchased (in shares)	16,418,950
Cost of Shares Repurchased	$ 1,258
Average price paid per share (in usd per share)	$ 76.60
Repurchase of common stock (in shares)	769,935
Cost of Shares Repurchased	$ 82	$ 106
Average price paid per share (in usd per share)	$ 106.60
Number of shares repurchased (in shares)	17,188,885
Cost of Shares Repurchased	$ 1,340
Average price paid per share (in usd per share)	$ 77.95