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Share Repurchase Program
 9 Months Ended
Sep. 30, 2015
Equity [Abstract]  
Share Repurchase Program
15. Share Repurchase Program

During the third quarter of 2015 the Company completed its $3 billion share repurchase program. As shares were repurchased, they were constructively retired and returned to an unissued state. During the three months ended September 30, 2015, the Company repurchased 10.9 million shares under the program for an average price of $40.98 per share for an aggregate amount of $444 million. During the nine months ended September 30, 2015, the Company repurchased 44.0 million shares under the program for an average price of $50.53 per share for an aggregate amount of $2,221 million.