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Computation of Earnings per Common Share - Computation of Basic and Diluted EPS (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Earnings Per Share [Abstract]        
Net income available to common shareholders $ 144 $ 97 $ 281 $ 189
Less: Dividends paid on and earnings allocated to participating securities (3) (1) (4) (3)
Earnings applicable to common stock $ 141 $ 96 $ 277 $ 186
Weighted average common shares outstanding 464,092,947 461,933,533 463,695,136 463,463,751
Basic earnings per common share $ 0.30 $ 0.21 $ 0.60 $ 0.40
Earnings applicable to common stock $ 141 $ 96 $ 277 $ 186
Potential dilutive common shares 801,591 555,960 698,385 487,317
Total shares for diluted earnings per common share computation 464,894,538 462,489,493 464,393,521 463,951,068
Diluted earnings per common share and common share equivalents $ 0.30 $ 0.21 $ 0.60 $ 0.40