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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Schedule of Authorized Common Stock Repurchase Programs Shares of Common Stock issued, in treasury and outstanding were:
 
 
 
Shares Issued
 
Treasury Shares
 
Shares
Outstanding
Balance at January 1, 2016
 
1,996,537,778

 
(416,504,624
)
 
1,580,033,154

Shares repurchased
 
—

 
(61,972,713
)
 
(61,972,713
)
Exercise of stock options and issuance of
   other stock awards
 
—

 
10,305,100

 
10,305,100

Balance at December 31, 2016
 
1,996,537,778

 
(468,172,237
)
 
1,528,365,541

Shares repurchased
 
—

 
(50,598,902
)
 
(50,598,902
)
Exercise of stock options and issuance of
   other stock awards
 
—

 
10,369,445

 
10,369,445

Balance at December 31, 2017
 
1,996,537,778

 
(508,401,694
)
 
1,488,136,084

Shares repurchased
 
—

 
(47,258,884
)
 
(47,258,884
)
Exercise of stock options and issuance of
   other stock awards
 
—

 
10,122,655

 
10,122,655

Balance at December 31, 2018
 
1,996,537,778

 
(545,537,923
)
 
1,450,999,855