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Stockholders' Equity
 12 Months Ended
Dec. 31, 2021
Stockholders' Equity Note [Abstract]  
Stockholders' Equity Stockholders' Equity
The following table summarizes the changes in shares of Common Stock outstanding and Treasury Stock:
Common Stock OutstandingTreasury Stock
Balance at December 31, 2018187,675,082 135,662,830 
Repurchases of common stock(18,595,315)18,595,315 
Issuance of treasury stock1,276,797 (1,276,797)
Conversions to common stock92,379 (92,379)
Balance at December 31, 2019170,448,943 152,888,969 
Issuance of treasury stock1,526,245 (1,526,245)
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 
At December 31, 2021, 36,722,032 shares were reserved for issuance under our stock plans and dividend reinvestment program.