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Basis of Financial Statements - Earnings Per Share (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Antidilutive securities excluded from computation of EPS, less than, amount (shares) 1 1 1