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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Income tax expense $ 256 $ 62 $ 43
Net income 793 699 415
Net income available to common stockholders 76 84 49
Comprehensive income available for common stockholders 87 80 39
Parent Company [Member]      
Loss before equity in income of subsidiary 92 (1)  
Undistributed Gain Loss of Subsidiaries 147 117 67
Income tax expense 163 32 18
Net income 76 84 49
Net income available to common stockholders 76 84 49
Cumulative translation adjustment, net of tax 11 (4) (10)
Comprehensive income available for common stockholders $ 87 $ 80 $ 39