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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]
Retained Earnings [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Accumulated Other Comprehensive (Loss) Income [Member]
Cumulative Effect, Period of Adoption, Adjustment [Member]
Non-controlling Interests [Member]
Total stockholders' equity, beginning balance at Dec. 31, 2017 $ 865 $ 2 $ (116) $ 837 $ 579   $ (442)   $ 5
Total stockholders' equity, beginning balance (Accounting Standards Update 2018-02 [Member]) at Dec. 31, 2017           $ 9   $ (9)  
Shares, beginning balance at Dec. 31, 2017   185,343,034 2,386,406            
Common stock issued - compensation plans (in shares)   783,346              
Exercise of stock options, net 16     16          
Exercise of stock options, net (in shares)   1,078,187              
Purchases of treasury stock, at cost (634)   $ (634)            
Purchases of treasury stock at cost (in shares)     14,050,098            
Shares issued under employee stock purchase plan (in shares)     (12,411)            
Stock-based compensation expense 24     24          
Cancellation of unissued stock awards withheld to cover taxes (17)     (17)          
Net income (loss) 996       995       1
Dividends (117)       (117)        
Other comprehensive income (loss) (113)           (113)    
Total stockholders' equity, ending balance at Dec. 31, 2018 1,020 $ 2 $ (750) 860 1,466   (564)   6
Shares, ending balance at Dec. 31, 2018   187,204,567 16,424,093            
Common stock issued - compensation plans       1 (1)        
Common stock issued - compensation plans (in shares)   1,098,542              
Exercise of stock options, net 9     9          
Exercise of stock options, net (in shares)   590,369              
Purchases of treasury stock, at cost (322)   $ (322)            
Purchases of treasury stock at cost (in shares)     8,895,142            
Stock-based compensation expense 19     19          
Cancellation of unissued stock awards withheld to cover taxes (30)     (30)          
Net income (loss) (52)       (52)        
Dividends (164)       (164)        
Other comprehensive income (loss) 215           215    
Total stockholders' equity, ending balance at Dec. 31, 2019 695 $ 2 $ (1,072) 859 1,249   (349)   6
Shares, ending balance at Dec. 31, 2019   188,893,478 25,319,235            
Common stock issued - compensation plans       1 (1)        
Common stock issued - compensation plans (in shares)   222,665              
Exercise of stock options, net 16     16          
Exercise of stock options, net (in shares)   1,123,740              
Stock-based compensation expense 16     16          
Cancellation of unissued stock awards withheld to cover taxes (2)     (2)          
Net income (loss) 219       219        
Dividends (164)       (164)        
Dividends to non-controlling interests (4)               (4)
Other comprehensive income (loss) 39           39    
Total stockholders' equity, ending balance at Dec. 31, 2020 $ 815 $ 2 $ (1,072) $ 890 $ 1,303   $ (310)   $ 2
Shares, ending balance at Dec. 31, 2020   190,239,883 25,319,235