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Schedule I—Condensed Financial Information of Registrant (Parent Company Only) (Condensed Statements Of Comprehensive Income) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income tax expense $ 62 $ 43 $ 47
Net income 699 415 459
Net income available to common stockholders 84 49 45
Comprehensive income available for common stockholders 80 39 30
Parent Company [Member]      
Loss before equity in income of subsidiary (1)    
Undistributed Gain Loss of Subsidiaries 117 67 63
Income tax expense 32 18 18
Net income 84 49 45
Net income available to common stockholders 84 49 45
Cumulative translation adjustment, net of tax (4) (10) (15)
Comprehensive income available for common stockholders $ 80 $ 39 $ 30