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Consolidated Statements of Stockholders' Equity - USD ($)
shares in Millions, $ in Millions
Total
Stock-Based Compensation on Tender Offer [Member]
Common Stock [Member]
Additional Paid in Capital [Member]
Additional Paid in Capital [Member]
Stock-Based Compensation on Tender Offer [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Retained Earnings (Loss) [Member]
Total Company Stockholders' Equity [Member]
Total Company Stockholders' Equity [Member]
Stock-Based Compensation on Tender Offer [Member]
Noncontrolling Interests [Member]
Beginning Balance at Dec. 31, 2014 $ 20,772   $ 4 $ 8,341   $ (834) $ 13,181 $ 20,692   $ 80
Beginning Balance, shares at Dec. 31, 2014     419              
Net income (loss) (767)           (769) (769)   2
Other comprehensive income (loss), net (719)         (719)   (719)    
Cash dividends, per common share (710)           (710) (710)    
Noncontrolling interest (5)                 (5)
Stock-based compensation 109     109       109    
Common stock issued 7     7       7    
Common stock issued, shares     1              
Withholding taxes (5)     (5)       (5)    
Share repurchases, value (2,221)     (446)     (1,775) (2,221)    
Share repurchases, shares     (44)              
Excess tax benefit from stock-based compensation (1)     (1)       (1)    
Ending Balance at Dec. 31, 2015 16,460   $ 4 8,005   (1,553) 9,927 16,383   77
Ending Balance, shares at Dec. 31, 2015     376              
Net income (loss) (2,416)           (2,412) (2,412)   (4)
Other comprehensive income (loss), net 101         101   101    
Cash dividends, per common share (230)           (230) (230)    
Noncontrolling interest (10)                 (10)
Stock-based compensation 87     87       87    
Common stock issued 4     4       4    
Common stock issued, shares     2              
Stock issued in acquisition 18     18       18    
Stock issued in acquisition, shares     1              
Withholding taxes (4)     (4)       (4)    
Excess tax benefit from stock-based compensation (7)     (7)       (7)    
Ending Balance at Dec. 31, 2016 14,003   $ 4 8,103   (1,452) 7,285 13,940   63
Ending Balance, shares at Dec. 31, 2016     379              
Net income (loss) (236)           (237) (237)   1
Other comprehensive income (loss), net 342         342   342    
Cash dividends, per common share (76)           (76) (76)    
Adoption of new accounting standards (5)     1     (6) (5)    
Noncontrolling interest 2                 2
Stock-based compensation 105 $ 20   105 $ 20     105 $ 20  
Common stock issued 13     13       13    
Common stock issued, shares     1              
Withholding taxes (8)     (8)       (8)    
Ending Balance at Dec. 31, 2017 $ 14,160   $ 4 $ 8,234   $ (1,110) $ 6,966 $ 14,094   $ 66
Ending Balance, shares at Dec. 31, 2017     380