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Equity And Earnings Per Share (Basic Table) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Basic earnings per share:        
Net income available for common stockholders $ 20 $ 22 $ 80 $ 32
Weighted average shares of common stock outstanding:        
Weighted Average Number of Shares Outstanding, Basic 67,083,654 62,458,655 65,351,842 60,152,525
Basic earnings per share $ 0.30 $ 0.35 $ 1.22 $ 0.53
Common Class A        
Weighted average shares of common stock outstanding:        
Weighted Average Number of Shares Outstanding, Basic 67,083,554 62,458,555 65,351,742 60,152,425
Common Class B        
Weighted average shares of common stock outstanding:        
Weighted Average Number of Shares Outstanding, Basic 100 100 100 100