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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 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
 Second Quarter
 2021202020212020
($ in millions, except per share amounts,
shares in millions)
Net income$819 $392 $819 $392 
Dividend equivalent payments— — — — 
Income available to common stockholders$819 $392 $819 $392 
Weighted-average shares outstanding248.9 255.4 248.9 255.4 
Dilutive effect of outstanding options and share-settled awards  1.1 1.3 
Adjusted weighted-average shares outstanding  250.0 256.7 
Earnings per share$3.29 $1.53 $3.28 $1.53 
 BasicDiluted
 First Six Months
 2021202020212020
($ in millions, except per share amounts,
shares in millions)
Net income$1,492 $773 $1,492 $773 
Dividend equivalent payments(1)(1)— (1)
Income available to common stockholders$1,491 $772 $1,492 $772 
Weighted-average shares outstanding250.1 256.3 250.1 256.3 
Dilutive effect of outstanding options and share-settled awards  1.2 1.4 
Adjusted weighted-average shares outstanding 251.3 257.7 
Earnings per share$5.96 $3.01 $5.94 $3.00