Annual report pursuant to Section 13 and 15(d)

Stock-based Compensation Plans - Stock Options, Narrative (Details)

v3.10.0.1
Stock-based Compensation Plans - Stock Options, Narrative (Details) - $ / shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Options outstanding (in shares) 0 16,600,000
Options outstanding (in dollars per share)   $ 43.44
Options exercised (in shares) 2,100,000  
Options forfeited (in shares) 14,500,000  
Options exercised (in dollars per share) $ 30.71  
Options forfeited (in dollars per share) $ 45.29