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Equity And Earnings Per Share (Basic Table) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Basic earnings per share:        
Net income available for common stockholders $ 27 $ 23 $ 60 $ 10
Weighted average shares of common stock outstanding:        
Weighted Average Number of Shares Outstanding, Basic 64,967,364 59,481,778 64,476,421 58,980,348
Basic earnings per share $ 0.41 $ 0.38 $ 0.93 $ 0.17
Common Class A        
Weighted average shares of common stock outstanding:        
Weighted Average Number of Shares Outstanding, Basic 64,967,264 59,481,678 64,476,321 58,980,248
Common Class B        
Weighted average shares of common stock outstanding:        
Weighted Average Number of Shares Outstanding, Basic 100 100 100 100