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Earnings Per Share (Tables)
3 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the calculation of basic and diluted earnings per share:

 BasicDiluted
 First Quarter
 2021202020212020
($ in millions, except per share amounts,
shares in millions)
Net income$673 $381 $673 $381 
Dividend equivalent payments(1)(1)— (1)
Income available to common stockholders$672 $380 $673 $380 
Weighted-average shares outstanding251.4 257.3 251.4 257.3 
Dilutive effect of outstanding options and share-settled awards  1.2 1.4 
Adjusted weighted-average shares outstanding  252.6 258.7 
Earnings per share$2.67 $1.48 $2.66 $1.47