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EARNINGS PER SHARE - Reconciliation of Numerators and Denominators Used to Calculate Basic EPS and Diluted EPS (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]                      
Net income $ 147 $ 167 $ 174 $ 151 $ 215 $ 111 $ 95 $ 83 $ 639 $ 504 $ 215
Weighted average shares of common stock outstanding (shares)                 133 149 168
Dilutive effect stock-based awards (shares)                 1 1 1
Diluted weighted average shares of common stock outstanding (shares)                 134 150 169
Basic earnings per share attributable to common stockholders (USD per share) $ 1.15 $ 1.28 $ 1.30 $ 1.09 $ 1.52 $ 0.75 $ 0.63 $ 0.53 $ 4.81 $ 3.38 $ 1.28
Diluted earnings per share attributable to common stockholders (USD per share) $ 1.14 $ 1.27 $ 1.29 $ 1.08 $ 1.51 $ 0.75 $ 0.63 $ 0.52 $ 4.78 $ 3.36 $ 1.27