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Stockholders' Equity
 12 Months Ended
Dec. 31, 2023
Stockholders' Equity Note [Abstract]  
Stockholders' Equity Stockholders' Equity
Retirement of Treasury Stock
In December 2023, we retired 53 million shares of treasury stock and returned these shares to the status of unissued shares of common stock.
The following table summarizes the changes in shares of Common Stock outstanding and Treasury Stock:
Common Stock OutstandingTreasury Stock
Balance at December 31, 2020171,975,188 151,362,724 
Issuance of treasury stock2,756,207 (2,756,207)
Balance at December 31, 2021174,731,395 148,606,517 
Repurchases of common stock(2,750,000)2,750,000 
Issuance of treasury stock2,049,192 (2,049,192)
Balance at December 31, 2022174,030,587 149,307,325 
Retirement of treasury stock
— (53,000,000)
Issuance of treasury stock2,335,246 (2,335,246)
Balance at December 31, 2023176,365,833 93,972,079 
At December 31, 2023, 31,471,987 shares were reserved for issuance under our stock plans and dividend reinvestment program.