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Consolidated Statements of Stockholders' Equity - USD ($)
$ in Millions
Total
Common Stock [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Balance at Dec. 31, 2013   $ 16 $ (1,592) $ 16,579 $ (8,570) $ 106
Balance (Shares) at Dec. 31, 2013   1,560,302,634        
Net income (loss) $ (119)       (119)  
Other comprehensive income (loss), net of tax            
Foreign currency translation adjustment (22)         (22)
Net change in unrealized gains and losses on derivative financial instruments, net of tax 78         78
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments and Tax 0          
Net change in unrealized costs associated with certain retirement plans 18         (18)
Impact of stock-based compensation plans, net of tax (Shares)   14,715,602        
Stock Issued During Period, Value, New Issues   $ 0        
Impact of stock-based compensation plans, net of tax       124    
Acquisition of treasury stock     (125)      
Balance (Shares) at Dec. 31, 2014   1,575,018,236        
Balance at Dec. 31, 2014   $ 16 (1,717) 16,703 (8,689) 144
Net income (loss) (239)       (239)  
Other comprehensive income (loss), net of tax            
Foreign currency translation adjustment (16)         (16)
Net change in unrealized gains and losses on derivative financial instruments, net of tax (67)         (67)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments and Tax 0          
Net change in unrealized costs associated with certain retirement plans $ (27)         27
Impact of stock-based compensation plans, net of tax (Shares)   19,195,550        
Stock Issued During Period, Value, New Issues   $ 0        
Impact of stock-based compensation plans, net of tax       157    
Balance (Shares) at Dec. 31, 2015 1,594,213,786 1,594,213,786        
Balance at Dec. 31, 2015 $ 6,320 $ 16 (1,717) 16,860 (8,927) 88
Other comprehensive income (loss), net of tax            
ProfitLossDueToRounding         1  
Net income (loss) 347       347  
Foreign currency translation adjustment (25)         (25)
Net change in unrealized gains and losses on derivative financial instruments, net of tax (45)         (45)
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments and Tax (6)         (6)
Net change in unrealized costs associated with certain retirement plans $ 11         (11)
Impact of stock-based compensation plans, net of tax (Shares)   15,457,031        
Stock Issued During Period, Value, New Issues          
Impact of stock-based compensation plans, net of tax       153    
Balance (Shares) at Dec. 31, 2016 1,609,670,817 1,609,670,817        
Balance at Dec. 31, 2016 $ 6,733 $ 16 $ (1,717) 17,014 (8,581) $ 1
Other comprehensive income (loss), net of tax            
ProfitLossDueToRounding       $ 1 $ (1)