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Capital Stock - Authorized Common Stock Repurchase Programs (Details) - shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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) (561,531,524)    
Balance at December 31 (in shares) (577,363,557) (561,531,524)  
Class A Common Stock, no par value      
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) (561,531,524) (545,537,923) (508,401,694)
Shares repurchased (in shares) (25,071,845) (30,902,465) (47,258,884)
Exercise of stock options and issuance of other stock awards (in shares) 9,239,812 14,908,864 10,122,655
Balance at December 31 (in shares) (577,363,557) (561,531,524) (545,537,923)
Shares Outstanding      
Balance at January 1 (in shares) 1,435,006,254 1,450,999,855 1,488,136,084
Shares repurchased (in shares) (25,071,845) (30,902,465) (47,258,884)
Exercise of stock options and issuance of other stock awards (in shares) 9,239,812 14,908,864 10,122,655
Balance at December 31 (in shares) 1,419,174,221 1,435,006,254 1,450,999,855