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Shareholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2015
Equity [Abstract]  
Summary of Shares Outstanding
The following table summarizes the shares outstanding for the three years ended December 31, 2015:
 
Common
Stock
 
Treasury
Stock
 
Shares
Outstanding
Balance, Jan. 1, 2013
581,146,136

 
(274,013,542
)
 
307,132,594

Increase in treasury stock due to separation and merger transaction (Note 2)
—

 
(21,650,454
)
 
(21,650,454
)
Purchases
—

 
(11,491,058
)
 
(11,491,058
)
Issuances
—

 
3,301,682

 
3,301,682

Balance, Dec. 31, 2013
581,146,136

 
(303,853,372
)
 
277,292,764

Purchases
—

 
(7,626,382
)
 
(7,626,382
)
Issuances
—

 
2,298,184

 
2,298,184

Balance, Dec. 31, 2014
581,146,136

 
(309,181,570
)
 
271,964,566

Purchases
—

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

 
1,904,215

 
1,904,215

Balance, Dec. 31, 2015
581,146,136

 
(314,270,127
)
 
266,876,009