SHAREHOLDERS' EQUITY - Stock Repurchase (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Sep. 30, 2014
Equity [Abstract]
Number of shares authorized to be repurchased for retirement (in shares)				50,000,000
Remaining number of shares authorized to be repurchased (in shares)	12,900,000
Repurchase and retirement of common stock (in shares)	14,900,000	17,200,000	6,700,000
Repurchase and retirement of common stock to offset the dilutive impact of the grant of long-term stock awards (in shares)	1,100,000	741,000	1,700,000
Repurchase and retirement of common stock	$ 459	$ 456	$ 158