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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Earnings Per Share [Abstract]      
Net income $ 272 $ 212 $ 192
Weighted average shares of common stock outstanding (in shares) 67 70 70
Basic (in dollars per share) $ 4.03 $ 3.04 $ 2.72
Net income $ 272 $ 212 $ 192
Dilutive effect of stock options and restricted stock units (in shares) 1 1 2
Weighted average shares of common stock outstanding (in shares) 68 71 72
Diluted (in dollars per share) $ 3.99 $ 2.99 $ 2.65
Common stock equivalents excluded from income per diluted share because of their anti-dilutive effect (in shares) 1 1 1