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Equity And Earnings Per Share (Basic Table) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Basic earnings per share:      
Net income available for common stockholders $ 84 $ 49 $ 45
Weighted average shares of common stock outstanding:      
Weighted Average Number of Shares Outstanding, Basic 66,013,247 61,043,071 56,492,381
Basic earnings per share $ 1.28 $ 0.80 $ 0.79
Common Class A      
Weighted average shares of common stock outstanding:      
Weighted Average Number of Shares Outstanding, Basic 66,013,147 61,042,971 56,492,281
Common Class B      
Weighted average shares of common stock outstanding:      
Weighted Average Number of Shares Outstanding, Basic 100 100 100