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Basis of Financial Statements - Earnings Per Share (Details) - shares
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]        
Antidilutive securities excluded from computation of EPS, less than in 2021 (in shares) 1 2 1 1