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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, 2021
Dec. 31, 2020
Dec. 31, 2019
Income tax expense $ 151 $ 77 $ 68
Net income 1,636 1,179 1,089
Net income available to common stockholders 308 195 161
Comprehensive income available for common stockholders 286 221 165
Parent Company [Member]      
Loss before equity in income of subsidiary   (3) (2)
Undistributed Gain Loss of Subsidiaries 383 237 208
Income tax expense 75 39 45
Net income 308 195 161
Net income available to common stockholders 308 195 161
Cumulative translation adjustment, net of tax (22) 26 4
Comprehensive income available for common stockholders $ 286 $ 221 $ 165