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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Income tax expense $ 71 $ 256 $ 62
Net income 1,125 793 699
Net income available to common stockholders 169 76 84
Comprehensive income available for common stockholders 156 87 80
Parent Company [Member]      
Loss before equity in income of subsidiary 2 92 (1)
Undistributed Gain Loss of Subsidiaries 206 147 117
Income tax expense 39 163 32
Net income 169 76 84
Net income available to common stockholders 169 76 84
Cumulative translation adjustment, net of tax (13) 11 (4)
Comprehensive income available for common stockholders $ 156 $ 87 $ 80