SHAREHOLDERS' EQUITY (Details) $ in Millions	1 Months Ended					6 Months Ended	12 Months Ended
	May 31, 2016 shares	Feb. 29, 2016 USD ($) shares	Apr. 30, 2015 shares	Feb. 28, 2015 USD ($) shares	Aug. 31, 2011 shares	Jun. 30, 2016 agreement shares	Dec. 31, 2015 shares
Shareholder's Equity
Authorized amount of share repurchase program | $				$ 1,000
Number of accelerated repurchase agreements | agreement						2
Common Stock
Shareholder's Equity
Common stock, shares authorized to be repurchased				20,000,000
Amount of common stock to be repurchased under ASR agreement | $		$ 300		$ 300
Shares received under ASR agreement	232,012	2,459,490	555,511	2,066,293
Shares received under the ASR agreement compared to the shares the company expected to receive (as a percent)		85.00%		80.00%
Remaining shares authorized to be repurchased						17,423,858
Reacquired shares						5,654,877	6,267,699
Number of shares reacquired through the open market						5,474,701
Number of shares that have been repurchased through the exercise of stock options and vesting of stock awards						180,176	398,704
Common Stock | Nalco
Shareholder's Equity
Additional shares authorized to be repurchased contingent upon merger					10,000,000