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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Summary of Shares Outstanding
 
Common Stock

 
Treasury Stock

 
Shares Outstanding

January 1, 2015
581,146,136

 
(309,181,570
)
 
271,964,566

Purchases
—

 
(6,992,772
)
 
(6,992,772
)
Issuances
—

 
1,904,215

 
1,904,215

December 31, 2015
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