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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2022
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share Calculation
The following table sets forth the calculation of basic and diluted earnings per share:
 
 BasicDiluted
 202220212020202220212020
 ($ in millions except per share amounts, shares in millions)
Net income$3,270 $3,005 $2,013 $3,270 $3,005 $2,013 
Dividend equivalent payments(2)(2)(3)(1)— (2)
Income available to common stockholders$3,268 $3,003 $2,010 $3,269 $3,005 $2,011 
Weighted-average shares outstanding234.8 246.9 255.1 234.8 246.9 255.1 
Dilutive effect of outstanding options      
and share-settled awards   0.8 1.2 1.5 
Adjusted weighted-average shares outstanding   235.6 248.1 256.6 
Earnings per share$13.92 $12.16 $7.88 $13.88 $12.11 $7.84