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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, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Reconciliation of Basic Shares to Diluted Shares        
Basic (in shares) 503 509 504 508
Effect of dilutive securities (in shares) 6 8 6 9
Diluted (in shares) 509 517 510 517