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Consolidated Statements of Changes in Stockholders' Equity Consolidated Statement of Changes in Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Common Stocks
Additional Paid-in Capital
Retained Earnings
Treasury Stock, at Cost
AOCI Attributable to Parent [Member]
Additional Paid in Capital     $ 9,894      
Treasury Stock, Value         $ (1,598)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (79)         $ (79)
Common Stock, Shares, Outstanding   453,290        
Treasury Stock, Shares, Acquired   49,518        
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs 801          
Treasury Stock, Retired, Cost Method, Amount     0   0  
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures   2,003        
Stock Issued During Period, Shares, Share-based Compensation, Forfeited   439        
Dividends, Common Stock, Cash       $ 290    
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition     (64)      
Balance at beginning of period at Dec. 31, 2013       10,683    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Allocated Share-based Compensation Expense 98          
Net Income (Loss) Attributable to Parent 798     798    
Treasury stock acquired         1,796  
Stock Issued During Period, Value, Treasury Stock Reissued         82  
Return of shares under incentive and stock compensation plans to treasury stock (30)       (16)  
Total other comprehensive income 1,007         1,007
Balance at end of period at Dec. 31, 2014 18,720     11,191    
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs 801          
Stock Issued During Period, Shares, Conversion of Units   19,080        
Common Stock, Value, Issued   $ 5        
Additional Paid in Capital     9,123      
Treasury Stock, Value         (2,527)  
Retained Earnings (Accumulated Deficit)       11,191    
Accumulated Other Comprehensive Income (Loss), Net of Tax 928         928
Common Stock, Shares, Outstanding   424,416        
Treasury Stock, Shares, Acquired   28,431        
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs     90      
Treasury Stock, Retired, Cost Method, Amount     0   0  
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures   4,877        
Stock Issued During Period, Shares, Share-based Compensation, Forfeited   1,311        
Dividends, Common Stock, Cash       323    
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition     (165)      
Allocated Share-based Compensation Expense 78   78      
Net Income (Loss) Attributable to Parent 1,682     1,682    
Treasury stock acquired         1,250  
Stock Issued During Period, Value, Treasury Stock Reissued         184  
Return of shares under incentive and stock compensation plans to treasury stock (42)       (54)  
Total other comprehensive income (1,257)         (1,257)
Balance at end of period at Dec. 31, 2015 17,642          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs         90  
Stock Issued During Period, Shares, Conversion of Units   2,270        
Common Stock, Value, Issued 5 $ 5        
Additional Paid in Capital 8,973   8,973      
Treasury Stock, Value (3,557)       (3,557)  
Retained Earnings (Accumulated Deficit) 12,550     12,550    
Accumulated Other Comprehensive Income (Loss), Net of Tax (329)         (329)
Common Stock, Shares, Outstanding   401,821        
Treasury Stock, Shares, Acquired   30,782        
Adjustments to Additional Paid in Capital, Stock Issued, Issuance Costs     16      
Treasury Stock, Retired, Cost Method, Amount     (3,646)   3,647  
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures   3,766        
Stock Issued During Period, Shares, Share-based Compensation, Forfeited   1,243        
Dividends, Common Stock, Cash       332    
Adjustments to Additional Paid in Capital, Share-based Compensation, Employee Stock Purchase Program, Requisite Service Period Recognition     (143)      
Allocated Share-based Compensation Expense 81   74      
Net Income (Loss) Attributable to Parent 896     896    
Treasury stock acquired         1,330  
Stock Issued During Period, Value, Treasury Stock Reissued         153  
Return of shares under incentive and stock compensation plans to treasury stock (9)       (54)  
Total other comprehensive income (8)         (8)
Balance at end of period at Dec. 31, 2016 16,903          
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Adjustments to Additional Paid in Capital, Stock Issued, Own-share Lending Arrangement, Issuance Costs         16  
Stock Issued During Period, Shares, Conversion of Units   387        
Common Stock, Value, Issued 4 $ 4        
Additional Paid in Capital 5,247   $ 5,247      
Treasury Stock, Value (1,125)       $ (1,125)  
Retained Earnings (Accumulated Deficit) 13,114     $ 13,114    
Accumulated Other Comprehensive Income (Loss), Net of Tax $ (337)         $ (337)
Common Stock, Shares, Outstanding   373,949