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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2025
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
 Second Quarter
 2025202420252024
($ in millions, except per share amounts,
shares in millions)
Net income$768 $737 $768 $737 
Dividend equivalent payments(1)(1)— (1)
Income available to common stockholders$767 $736 $768 $736 
Weighted-average shares outstanding225.0 226.0 225.0 226.0 
Dilutive effect of outstanding options and share-settled awards  0.2 0.4 
Adjusted weighted-average shares outstanding  225.2 226.4 
Earnings per share$3.41 $3.26 $3.41 $3.25 
 BasicDiluted
 First Six Months
 2025202420252024
($ in millions, except per share amounts,
shares in millions)
Net income$1,518 $790 $1,518 $790 
Dividend equivalent payments(2)(2)(1)(2)
Income available to common stockholders$1,516 $788 $1,517 $788 
Weighted-average shares outstanding225.5 225.9 225.5 225.9 
Dilutive effect of outstanding options and share-settled awards  0.3 0.4 
Adjusted weighted-average shares outstanding 225.8 226.3 
Earnings per share$6.72 $3.49 $6.72 $3.48