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CONDENSED CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($)
shares in Millions, $ in Millions
Total
Preferred Stock
Preferred Stock
Preferred Class A [Member]
Preferred Stock
Preferred Class B [Member]
Common Stock
Additional Paid-in Capital
Accumulated Deficit
Accumulated Other Comprehensive Loss
Balance, at Dec. 31, 2014 $ 5,375 $ 0     $ 3 $ 7,350 $ (1,729) $ (249)
Balance, (in shares) at Dec. 31, 2014         289      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 268           268  
Other comprehensive income (loss) 150             150
Conversion of convertible debentures 30         30    
Conversion of convertible debentures, shares         3      
Exercise of stock options and related tax effects 2         2    
Repurchases of common stock (50)         (50)    
Repurchases of common stock, shares         (2)      
Issuance of common stock for share-based compensation, net of shares withheld to pay taxes (10)         (10)    
Issuance of common stock for share-based compensation, net of shares withheld to pay taxes, shares         1      
Share-based compensation 34         34    
Balance, at Dec. 31, 2015 5,799 0     $ 3 7,356 (1,461) (99)
Balance, (in shares) at Dec. 31, 2015         291      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Net income 552           552  
Other comprehensive income (loss) (38)             (38)
Conversion of convertible debentures 5         5    
Conversion of convertible debentures, shares         1      
Exercise of stock options and related tax effects 4         4    
Issuance of preferred stock 394   $ 394          
Repurchases of common stock (452)         (452)    
Repurchases of common stock, shares         (19)      
Issuance of common stock for share-based compensation, net of shares withheld to pay taxes (22)         (22)    
Issuance of common stock for share-based compensation, net of shares withheld to pay taxes, shares         1      
Share-based compensation 30         30    
Balance, at Dec. 31, 2016 6,272 394     $ 3 6,921 (909) (137)
Balance, (in shares) at Dec. 31, 2016         274      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Cumulative effect of accounting change 3           3  
Net income 614           614  
Other comprehensive income (loss) 111             111
Conversion of convertible debentures 3         3    
Exercise of stock options and related tax effects 1         1    
Issuance of preferred stock 295     $ 295        
Preferred stock dividends (25)           (25)  
Repurchases of common stock (362)         (362)    
Repurchases of common stock, shares         (9)      
Issuance of common stock for share-based compensation, net of shares withheld to pay taxes (22)         (22)    
Issuance of common stock for share-based compensation, net of shares withheld to pay taxes, shares         2      
Share-based compensation 41         41    
Balance, at Dec. 31, 2017 $ 6,931 $ 689     $ 3 $ 6,582 $ (317) $ (26)
Balance, (in shares) at Dec. 31, 2017         267