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Earnings Per Share
 12 Months Ended
Dec. 31, 2024
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The following table provides the calculation of earnings per share and the reconciliation of earnings per share and earnings per diluted share for the years ended December 31:
($ in millions, except per share data)202420232022
Net income available to common shareholders$2,155 2,212 2,330 
Less: Income allocated to participating securities— — 2 
Net income allocated to common shareholders2,155 2,212 2,328 
Average common shares outstanding - basic682 684 689 
Effect of dilutive stock-based awards5 4 6 
Average common shares outstanding - diluted687 688 695 
Earnings per share - basic3.16 3.23 3.38 
Earnings per share - diluted3.14 3.22 3.35 
Anti-dilutive stock-based awards excluded from diluted shares1 6 3