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Capital Stock (Tables)
 12 Months Ended
Dec. 31, 2016
Class of Stock Disclosures [Abstract]  
Schedule of Common 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, 2014
2,109,316,331

 
(520,313,919
)
 
1,589,002,412

Repurchase of shares
 
 
(45,206,473
)
 
(45,206,473
)
Issuance of stock awards and exercise of stock options
 
 
3,103,757

 
3,103,757

Balances, December 31, 2014
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