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Condensed Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($)
shares in Thousands, $ in Millions
Total
Preferred Stock [Member]
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
AOCI Attributable to Parent [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Cumulative effect of accounting changes, net of tax         $ 5   $ (5)
Adjusted balance, beginning of period         9,647   658
Beginning balance at Dec. 31, 2017       $ 4,379 9,642 $ (1,194) 663
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of shares under incentive and stock compensation plans       (74)      
Stock-based compensation plans expense       61      
Issuance of shares for warrant exercise       (3)   3  
Net income $ 597       597    
Dividends declared on preferred stock 0       0    
Dividends declared on common stock         (88)    
Treasury stock acquired           0  
Issuance of shares under incentive and stock compensation plans           81  
Net shares acquired related to employee incentive and stock compensation plans           (31)  
Total other comprehensive income (loss)             (897)
Ending balance at Mar. 31, 2018 $ 13,143 $ 0 $ 4 4,363 10,156 (1,141) (239)
Preferred Shares Outstanding, beginning of period at Dec. 31, 2017   0          
Preferred Shares Outstanding, end of period at Mar. 31, 2018   0          
Common Shares Outstanding, beginning of period (in thousands) at Dec. 31, 2017     356,835        
Stock Issued or Granted During Period, Share-based Compensation [Abstract]              
Treasury stock acquired     0        
Issuance of shares under incentive and stock compensation plans     1,770        
Return of shares under incentive and stock compensation plans to treasury stock     (595)        
Issuance of shares for warrant exercise     67        
Common Shares Outstanding, at end of period at Mar. 31, 2018     358,077        
Stock Issued or Granted During Period, Share-based Compensation [Abstract]              
Cash dividends declared per common share $ 0.25            
Cash dividends declared per preferred share $ 0            
Cumulative effect of accounting changes, net of tax         0   0
Adjusted balance, beginning of period         11,055   (1,579)
Beginning balance at Dec. 31, 2018 $ 13,101     4,378 11,055 (1,091) (1,579)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of shares under incentive and stock compensation plans       (68)      
Stock-based compensation plans expense       55      
Issuance of shares for warrant exercise       (36)   36  
Net income 630       630    
Dividends declared on preferred stock 5       (5)    
Dividends declared on common stock         (108)    
Treasury stock acquired           0  
Issuance of shares under incentive and stock compensation plans           71  
Net shares acquired related to employee incentive and stock compensation plans           (30)  
Total other comprehensive income (loss)             694
Ending balance at Mar. 31, 2019 $ 14,340 $ 334 $ 4 $ 4,329 $ 11,572 $ (1,014) $ (885)
Preferred Shares Outstanding, beginning of period at Dec. 31, 2018   13,800          
Preferred Shares Outstanding, end of period at Mar. 31, 2019   13,800          
Common Shares Outstanding, beginning of period (in thousands) at Dec. 31, 2018     359,151        
Stock Issued or Granted During Period, Share-based Compensation [Abstract]              
Treasury stock acquired     0        
Issuance of shares under incentive and stock compensation plans   0 1,534        
Return of shares under incentive and stock compensation plans to treasury stock     (601)        
Issuance of shares for warrant exercise     781        
Common Shares Outstanding, at end of period at Mar. 31, 2019     360,865        
Stock Issued or Granted During Period, Share-based Compensation [Abstract]              
Cash dividends declared per common share $ 0.30            
Cash dividends declared per preferred share $ 375.00