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Earnings Per Share - Narrative (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities (in shares) 3 3   4
Maximum        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities (in shares)     1