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Earnings Per Share (Tables)
12 Months Ended
Dec. 31, 2024
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
 202420232022202420232022
 ($ in millions except per share amounts, shares in millions)
Net income$2,622 $1,827 $3,270 $2,622 $1,827 $3,270 
Dividend equivalent payments(3)(3)(2)(2)(3)(1)
Income available to common stockholders$2,619 $1,824 $3,268 $2,620 $1,824 $3,269 
Weighted-average shares outstanding226.1 226.9 234.8 226.1 226.9 234.8 
Dilutive effect of outstanding options      
and share-settled awards   0.3 0.5 0.8 
Adjusted weighted-average shares outstanding   226.4 227.4 235.6 
Earnings per share$11.58 $8.04 $13.92 $11.57 $8.02 $13.88