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Capital Stock (Tables)
12 Months Ended
Dec. 31, 2021
Class of Stock Disclosures [Abstract]  
Schedule of Common Stock
Shares of authorized common stock are 6.0 billion; issued, repurchased and outstanding shares were as follows:
Shares IssuedShares
Repurchased
Shares
Outstanding
Balances, January 1, 20192,109,316,331 (554,736,610)1,554,579,721 
Issuance of stock awards1,314,942 1,314,942 
Balances, December 31, 20192,109,316,331 (553,421,668)1,555,894,663 
Issuance of stock awards1,479,068 1,479,068 
Balances, December 31, 20202,109,316,331 (551,942,600)1,557,373,731 
Repurchase of shares(8,514,629)(8,514,629)
Issuance of stock awards1,310,891 1,310,891 
Balances, December 31, 20212,109,316,331 (559,146,338)1,550,169,993