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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Equity [Abstract]  
Summary of Shares Outstanding
 
Common Stock

 
Treasury Stock

 
Shares Outstanding

January 1, 2016
581,146,136

 
(314,270,127
)
 
266,876,009

Purchases
—

 
(10,725,869
)
 
(10,725,869
)
Issuances
—

 
1,180,020

 
1,180,020

December 31, 2016
581,146,136

 
(323,815,976
)
 
257,330,160

Purchases
—

 
(7,427,557
)
 
(7,427,557
)
Issuances
—

 
1,271,796

 
1,271,796

December 31, 2017
581,146,136

 
(329,971,737
)
 
251,174,399

Purchases
—

 
(15,877,364
)
 
(15,877,364
)
Issuances
—

 
564,399

 
564,399

December 31, 2018
581,146,136

 
(345,284,702
)
 
235,861,434