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Consolidated Statement of Changes in Stockholders' Equity - USD ($)
$ in Millions
Total
Preferred Stock, end of period
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock, at cost
Accumulated Other Comprehensive Income (Loss), net of tax
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Cumulative effect of accounting changes, net of tax         $ 0   $ 0
Adjusted balance beginning of period         12,550   (329)
Beginning balance at Dec. 31, 2015   $ 0   $ 8,973 12,550 $ (3,557) (329)
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Issuance of shares under incentive and stock compensation plans       (143)      
Stock-based compensation plans expense       74      
Tax benefit on employee stock options and share-based awards       5      
Issuance of shares for warrant exercise       (16)   16  
Treasury stock retired       3,646   3,647  
Net income (loss) $ 896       896    
Dividends declared on preferred stock 0       0    
Dividends declared on common stock         (332)    
Treasury stock acquired           (1,330)  
Issuance of shares under incentive and stock compensation plans           153  
Net shares acquired related to employee incentive and stock compensation plans           (54)  
Total other comprehensive income (loss)             (8)
Ending balance at Dec. 31, 2016 $ 16,903 $ 0 $ 4 5,247 13,114 (1,125) (337)
Common Shares Outstanding, beginning of period (in thousands) at Dec. 31, 2015     401,821,000        
Common Shares Outstanding              
Treasury stock acquired     (30,782,000)        
Issuance of shares under incentive and stock compensation plans     3,766,000        
Return of shares under incentive and stock compensation plans to treasury stock     (1,243,000)        
Issuance of shares for warrant exercise     387,000        
Common Shares Outstanding, end of period at Dec. 31, 2016     373,949,000        
Preferred Shares Outstanding, beginning of period at Dec. 31, 2015   0          
Preferred Shares Outstanding, end of period at Dec. 31, 2016   0          
Preferred Shares Outstanding              
Cash dividends declared per common share $ 0.86            
Issuance of preferred stock   $ 0          
Cumulative effect of accounting changes, net of tax         0   0
Adjusted balance beginning of period         13,114   (337)
Issuance of preferred shares 0            
Issuance of shares under incentive and stock compensation plans       (76)      
Stock-based compensation plans expense       104      
Tax benefit on employee stock options and share-based awards       0      
Issuance of shares for warrant exercise       (67)   67  
Treasury stock retired       829   829  
Net income (loss) $ (3,131)       (3,131)    
Dividends declared on preferred stock 0       0    
Dividends declared on common stock         (341)    
Treasury stock acquired           (1,028)  
Issuance of shares under incentive and stock compensation plans           100  
Net shares acquired related to employee incentive and stock compensation plans           (37)  
Total other comprehensive income (loss)             1,000
Ending balance at Dec. 31, 2017 $ 13,494 $ 0 $ 4 4,379 9,642 (1,194) 663
Common Shares Outstanding              
Treasury stock acquired     (20,218,000)        
Issuance of shares under incentive and stock compensation plans     2,301,000        
Return of shares under incentive and stock compensation plans to treasury stock     (747,000)        
Issuance of shares for warrant exercise     1,550,000        
Common Shares Outstanding, end of period at Dec. 31, 2017     356,835,000        
Preferred Shares Outstanding, end of period at Dec. 31, 2017   0          
Preferred Shares Outstanding              
Cash dividends declared per common share $ 0.94            
Issuance of preferred stock   $ 0          
Cumulative effect of accounting changes, net of tax         5   (5)
Adjusted balance beginning of period         9,647   658
Issuance of preferred shares 0            
Issuance of shares under incentive and stock compensation plans       (110)      
Stock-based compensation plans expense       123      
Tax benefit on employee stock options and share-based awards       0      
Issuance of shares for warrant exercise       (14)   14  
Treasury stock retired       0   0  
Net income (loss) $ 1,807       1,807    
Dividends declared on preferred stock (6)       6    
Dividends declared on common stock         (393)    
Treasury stock acquired           0  
Issuance of shares under incentive and stock compensation plans           132  
Net shares acquired related to employee incentive and stock compensation plans           (43)  
Total other comprehensive income (loss)             (2,237)
Ending balance at Dec. 31, 2018 $ 13,101 $ 334 $ 4 $ 4,378 $ 11,055 $ (1,091) $ (1,579)
Common Shares Outstanding              
Treasury stock acquired     0        
Issuance of shares under incentive and stock compensation plans     2,856,000        
Return of shares under incentive and stock compensation plans to treasury stock     (849,000)        
Issuance of shares for warrant exercise     309,000        
Common Shares Outstanding, end of period at Dec. 31, 2018     359,151,000        
Preferred Shares Outstanding, end of period at Dec. 31, 2018   13,800,000          
Preferred Shares Outstanding              
Cash dividends declared per common share $ 1.10            
Issuance of preferred stock   $ 334          
Issuance of preferred shares 13,800,000