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Basis of presentation and significant accounting policies and practices (Tables)
3 Months Ended
Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]  
Schedule of Earnings Per Share
Computation and reconciliation of earnings per common share are as follows (shares in millions):
 For Three Months Ended March 31,
 20212020
Net IncomeSharesEPSNet IncomeSharesEPS
Basic EPS:      
Net income$1,753   $1,174   
Income allocated to RSUs(8)  (6)  
Income allocated to common stock$1,745 922 $1.89 $1,168 931 $1.25 
Dilutive effect of stock compensation plans13  12 
Diluted EPS: 
Net income$1,753  $1,174 
Income allocated to RSUs(8) (6)
Income allocated to common stock$1,745 935 $1.87 $1,168 943 $1.24