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CONSOLIDATED STATEMENT OF STOCKHOLDERS’ EQUITY - USD ($)
shares in Millions, $ in Millions
Total
Common Stock
Additional Paid-in Capital
Accumulated Other Comprehensive Loss
Retained Earnings
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Adoption of ASU | Topic 606 $ 6       $ 6
Adoption of ASU | ASU 2018-02 $ 1       1
Beginning Balance (in shares) at Dec. 31, 2017 59 60      
Beginning Balance at Dec. 31, 2017 $ 1,337 $ 0 $ 1,044 $ (5) 298
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 107       107
1.625% Convertible Notes exchange transaction (in shares)   2      
1.625% Convertible Notes exchange transaction 108   108    
Other comprehensive loss, net (7)     (7)  
Share-based compensation 1   1    
Ending Balance (in shares) at Mar. 31, 2018   62      
Ending Balance at Mar. 31, 2018 $ 1,553 $ 0 $ 1,153 $ (12) $ 412