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Subsequent Events (Details) - Subsequent Event - USD ($)
$ / shares in Units, $ in Millions
6 Months Ended
Aug. 03, 2017
Dec. 31, 2017
Jul. 05, 2017
Subsequent Event [Line Items]      
Cash dividend declared (in dollars per share) $ 0.16    
Stock repurchase program, additional amount authorized to be repurchased $ 750    
Illinois Department of Revenue      
Subsequent Event [Line Items]      
Effective income tax rate, state and local   7.00% 5.25%