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Earnings Per Share - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 14, 2018
Mar. 02, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Earnings Per Share [Line Items]          
Stock options and equity instruments other than options granted in period (in shares) 20,760 231,162,000      
Exercise price (in dollars per share) $ 40.74 $ 41.97      
Number of shares of common stock equal to one unit (in shares)         1
Stock repurchased during period (in shares)     70,107    
Stock repurchased during period, value     $ 2.7    
Treasury stock acquired, weighted average cost per share (in dollars per share)     $ 39.10    
Employee Stock Option [Member]          
Earnings Per Share [Line Items]          
Weighted average number of stock options excluded form computation of diluted earnings per share (in shares)     128,777,000 175,026,000  
Employee Stock Option [Member]          
Earnings Per Share [Line Items]          
Stock options granted in period (in shares)   128,777,000      
Performance Shares [Member]          
Earnings Per Share [Line Items]          
Equity instruments other than options granted in shares (in shares)   58,078,000      
Restricted Stock Units [Member]          
Earnings Per Share [Line Items]          
Equity instruments other than options granted in shares (in shares)   44,307,000      
Minimum [Member]          
Earnings Per Share [Line Items]          
Vesting period (in months) 12 months 12 months      
Maximum [Member]          
Earnings Per Share [Line Items]          
Vesting period (in months) 36 months 36 months      
Deferred Compensation, Share-based Payments [Member]          
Earnings Per Share [Line Items]          
Number of units allocated to deferred compensation plan (in shares)     5,331.000   5,331.000