Annual report pursuant to Section 13 and 15(d)

SHAREHOLDERS' EQUITY - Share Repurchase Program (Details)

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SHAREHOLDERS' EQUITY - Share Repurchase Program (Details) - 2017 Share Repurchase Program
shares in Millions
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Equity, Class of Treasury Stock [Line Items]  
Repurchase of common stock shares (in shares) | shares 19.4
Common Stock Repurchased And Retired Average Cost Per Share | $ / shares $ 13.38