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Earnings Per Share - Reconciliation of Basic Shares to Diluted Shares (Details) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Reconciliation of Basic Shares to Diluted Shares        
Basic (in shares) 509 510 508 511
Effect of dilutive securities (in shares) 8 9 9 9
Diluted (in shares) 517 519 517 520