Quarterly report pursuant to Section 13 or 15(d)

Earnings Per Share (Computation of Basic and Diluted EPS) (Details)

v3.10.0.1
Earnings Per Share (Computation of Basic and Diluted EPS) (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Earnings Per Share [Abstract]          
Net income $ 21 $ 48 $ 61 $ 81 $ 230
Basic weighted average shares outstanding (in shares) 99.9 99.8 99.8 99.8  
Stock Options and restricted stock units (RSUs) (in shares) 0.1 0.0 0.0 0.0  
Diluted weighted average shares outstanding (in shares) 100.0 99.8 99.8 99.8  
Earnings per share          
Basic (in usd per share) $ 0.21 $ 0.48 $ 0.61 $ 0.81  
Diluted (in usd per share) $ 0.21 $ 0.48 $ 0.61 $ 0.81  
Dividends:          
Aggregate dividends paid to shareholders $ 27 $ 0 $ 27 $ 0