SHAREHOLDERS' EQUITY (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2017	Feb. 28, 2017	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	Feb. 28, 2015
Shareholder's Equity
Common stock, par value per share (in dollars per share)			$ 1.00		$ 1.00		$ 1.00
Common stock, shares authorized			800,000,000		800,000,000		800,000,000
Dividends declared per common share (in dollars per share)			$ 0.410	$ 0.370	$ 1.230	$ 1.110
Common Stock
Shareholder's Equity
Common stock, shares authorized to be repurchased								20,000,000
Remaining shares authorized to be repurchased			10,228,727		10,228,727
Amount of common stock to be repurchased under ASR agreement		$ 300
Shares received under ASR agreement	286,620	2,077,224
Shares received under the ASR agreement compared to the shares the company expected to receive (as a percent)		85.00%
Reacquired shares					2,315,345		4,707,629
Number of shares reacquired through the open market or private purchases					2,129,383		4,414,416
Number of shares that have been repurchased through the exercise of stock options and vesting of stock awards					185,962		293,213