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Capital Stock - Authorized Common Stock Repurchase Programs (Details) - shares
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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) (508,401,694)    
Balance at December 31 (in shares) (545,537,923) (508,401,694)  
Common Class A      
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) (508,401,694) (468,172,237) (416,504,624)
Shares repurchased (in shares) (47,258,884) (50,598,902) (61,972,713)
Exercise of stock options and issuance of other stock awards (in shares) 10,122,655 10,369,445 10,305,100
Balance at December 31 (in shares) (545,537,923) (508,401,694) (468,172,237)
Shares Outstanding      
Balance at January 1 (in shares) 1,488,136,084 1,528,365,541 1,580,033,154
Shares repurchased (in shares) (47,258,884) (50,598,902) (61,972,713)
Exercise of stock options and issuance of other stock awards (in shares) 10,122,655 10,369,445 10,305,100
Balance at December 31 (in shares) 1,450,999,855 1,488,136,084 1,528,365,541