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Earnings Per Share
 9 Months Ended
Sep. 30, 2023
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The following table sets forth the calculation of basic and diluted earnings per share:

 BasicDiluted
 Third Quarter
 2023202220232022
($ in millions, except per share amounts,
shares in millions)
Net income$478 $958 $478 $958 
Dividend equivalent payments(1)— (1)— 
Income available to common stockholders$477 $958 $477 $958 
Weighted-average shares outstanding226.4 233.2 226.4 233.2 
Dilutive effect of outstanding options and share-settled awards  0.6 0.8 
Adjusted weighted-average shares outstanding  227.0 234.0 
Earnings per share$2.11 $4.11 $2.10 $4.10 
 BasicDiluted
 First Nine Months
 2023202220232022
($ in millions, except per share amounts,
shares in millions)
Net income$1,300 $2,480 $1,300 $2,480 
Dividend equivalent payments(2)(1)(2)(1)
Income available to common stockholders$1,298 $2,479 $1,298 $2,479 
Weighted-average shares outstanding227.2 236.4 227.2 236.4 
Dilutive effect of outstanding options and share-settled awards  0.6 0.8 
Adjusted weighted-average shares outstanding 227.8 237.2 
Earnings per share$5.71 $10.49 $5.70 $10.45 

During the third quarters and first nine months of 2023 and 2022, dividend equivalent payments were made to certain holders of stock options and RSUs.  For purposes of computing basic earnings per share, dividend equivalent payments made to holders of stock options and RSUs were deducted from net income to determine income available to common stockholders. For purposes of computing diluted earnings per share, we evaluate on a grant-by-grant basis those stock options and RSUs receiving dividend equivalent payments under the two-class and treasury stock methods to determine which method is more dilutive for each grant. For those grants for which the two-class method was more dilutive, net income was reduced by dividend equivalent payments to determine income available to common stockholders. The dilution calculations exclude options having exercise prices exceeding the average market price of Common Stock as follows: 0.1 million in the third quarters and first nine months ended September 30, 2023 and 2022.