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Consolidated Statements of Changes in Shareholders' Equity (Unaudited) - USD ($)
shares in Millions, $ in Millions
Total
Cumulative effect of change in accounting principle
Common Stock
Paid-in Capital
Retained Earnings (Accumulated Deficit)
Retained Earnings (Accumulated Deficit)
Cumulative effect of change in accounting principle
Accumulated Other Comprehensive Loss
Treasury Stock
Beginning balance (in shares) at Dec. 31, 2018     185.4         (4.7)
Beginning balance at Dec. 31, 2018 $ 5,864 $ (2) $ 2 $ 6,657 $ (464) $ (2) $ (34) $ (297)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income attributable to common shareholders 113       113      
Common stock issuances (in shares) [1]     0.2         (0.1)
Common stock issuances [1] 6     11       $ (5)
Repurchases of common stock (in shares)               (0.3)
Repurchases of common stock (36)             $ (36)
Net other comprehensive loss (13)           (13)  
Ending balance (in shares) at Mar. 31, 2019     185.6         (5.1)
Ending balance at Mar. 31, 2019 5,932   $ 2 6,668 (353)   (47) $ (338)
Beginning balance (in shares) at Dec. 31, 2018     185.4         (4.7)
Beginning balance at Dec. 31, 2018 5,864 $ (2) $ 2 6,657 (464) $ (2) (34) $ (297)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income attributable to common shareholders 523              
Net other comprehensive loss (12)              
Ending balance (in shares) at Sep. 30, 2019     185.9         (5.1)
Ending balance at Sep. 30, 2019 6,190   $ 2 6,695 (123)   (46) $ (338)
Beginning balance (in shares) at Mar. 31, 2019     185.6         (5.1)
Beginning balance at Mar. 31, 2019 5,932   $ 2 6,668 (353)   (47) $ (338)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income attributable to common shareholders 170       170      
Common stock issuances (in shares) [1]     0.1          
Common stock issuances [1] 15     15        
Dividends (90)       (90)      
Ending balance (in shares) at Jun. 30, 2019     185.7         (5.1)
Ending balance at Jun. 30, 2019 6,027   $ 2 6,683 (273)   (47) $ (338)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income attributable to common shareholders 240       240      
Common stock issuances (in shares) [1]     0.2          
Common stock issuances [1] 12     12        
Net other comprehensive loss 1           1  
Dividends (90)       (90)      
Ending balance (in shares) at Sep. 30, 2019     185.9         (5.1)
Ending balance at Sep. 30, 2019 6,190   $ 2 6,695 (123)   (46) $ (338)
Beginning balance (in shares) at Dec. 31, 2019     185.9         (5.1)
Beginning balance at Dec. 31, 2019 6,121   $ 2 6,700 (207)   (36) $ (338)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income attributable to common shareholders 124       124      
Common stock issuances (in shares) [1]     0.3         (0.1)
Common stock issuances [1] 3     13       $ (10)
Net other comprehensive loss (5)           (5)  
Ending balance (in shares) at Mar. 31, 2020     186.2         (5.2)
Ending balance at Mar. 31, 2020 6,243   $ 2 6,713 (83)   (41) $ (348)
Beginning balance (in shares) at Dec. 31, 2019     185.9         (5.1)
Beginning balance at Dec. 31, 2019 6,121   $ 2 6,700 (207)   (36) $ (338)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income attributable to common shareholders 564              
Net other comprehensive loss (2)              
Ending balance (in shares) at Sep. 30, 2020     186.4         (5.2)
Ending balance at Sep. 30, 2020 6,512   $ 2 6,739 157   (38) $ (348)
Beginning balance (in shares) at Mar. 31, 2020     186.2         (5.2)
Beginning balance at Mar. 31, 2020 6,243   $ 2 6,713 (83)   (41) $ (348)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income attributable to common shareholders 176       176      
Common stock issuances (in shares) [1]     0.2          
Common stock issuances [1] 17     17        
Net other comprehensive loss 2           2  
Dividends (100)       (100)      
Ending balance (in shares) at Jun. 30, 2020     186.4         (5.2)
Ending balance at Jun. 30, 2020 6,338   $ 2 6,730 (7)   (39) $ (348)
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income attributable to common shareholders 264       264      
Common stock issuances [1] 9     9        
Net other comprehensive loss 1           1  
Dividends (100)       (100)      
Ending balance (in shares) at Sep. 30, 2020     186.4         (5.2)
Ending balance at Sep. 30, 2020 $ 6,512   $ 2 $ 6,739 $ 157   $ (38) $ (348)
[1] Includes stock-based compensation, employee stock purchase plan and direct stock reinvestment and purchase plan activity.