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Capital Stock
12 Months Ended
Dec. 31, 2017
Class of Stock Disclosures [Abstract]  
Capital Stock
Capital Stock:

Shares of authorized common stock are 6.0 billion; issued, repurchased and outstanding shares were as follows:
 
Shares Issued
 
Shares
Repurchased
 
Shares
Outstanding
Balances, January 1, 2015
2,109,316,331

 
(562,416,635
)
 
1,546,899,696

Issuance of stock awards
 
 
2,444,373

 
2,444,373

Balances, December 31, 2015
2,109,316,331

 
(559,972,262
)
 
1,549,344,069

Issuance of stock awards
 
 
2,041,478

 
2,041,478

Balances, December 31, 2016
2,109,316,331

 
(557,930,784
)
 
1,551,385,547

Issuance of stock awards
 
 
1,832,215

 
1,832,215

Balances, December 31, 2017
2,109,316,331

 
(556,098,569
)
 
1,553,217,762



At December 31, 2017, 31,246,310 shares of common stock were reserved for stock awards under PMI’s stock plans, and 250 million shares of preferred stock, without par value, were authorized but unissued. PMI currently has no plans to issue any shares of preferred stock.