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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

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