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Capital Stock - Authorized Common Stock Repurchase Programs (Details) - shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Shares Issued      
Balance at January 1 (in shares) 1,996,537,778    
Balance at December 31 (in shares) 1,996,537,778 1,996,537,778  
Treasury Shares      
Balance at January 1 (in shares) (577,363,557)    
Balance at December 31 (in shares) (604,907,239) (577,363,557)  
Common Stock      
Shares Issued      
Balance at January 1 (in shares) 1,996,537,778 1,996,537,778 1,996,537,778
Exercise of stock options and issuance of other stock awards (in shares) 0 0 0
Balance at December 31 (in shares) 1,996,537,778 1,996,537,778 1,996,537,778
Treasury Shares      
Balance at January 1 (in shares) (577,363,557) (561,531,524) (545,537,923)
Shares repurchased (in shares) (35,384,366) (25,071,845) (30,902,465)
Exercise of stock options and issuance of other stock awards (in shares) 7,840,684 9,239,812 14,908,864
Balance at December 31 (in shares) (604,907,239) (577,363,557) (561,531,524)
Shares Outstanding      
Balance at January 1 (in shares) 1,419,174,221 1,435,006,254 1,450,999,855
Shares repurchased (in shares) (35,384,366) (25,071,845) (30,902,465)
Exercise of stock options and issuance of other stock awards (in shares) 7,840,684 9,239,812 14,908,864
Balance at December 31 (in shares) 1,391,630,539 1,419,174,221 1,435,006,254