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Earnings Per Share - Antidilutive Stock Options Excluded from Diluted Earnings Per Share Calculation (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Stock Options        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive securities excluded from diluted earnings per share calculation (in shares) 2 1 2 1