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Condensed Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2018
Dec. 31, 2017
Current assets:    
Trade receivables, allowance for doubtful accounts $ 28 $ 63
FIS stockholders' equity:    
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 200,000,000 200,000,000
Preferred stock, shares issued (in shares) 0 0
Preferred stock, shares outstanding (in shares) 0 0
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 600,000,000 600,000,000
Common stock, shares issued (in shares) 433,000,000 432,000,000
Treasury stock, shares (in shares) 102,000,000 99,000,000