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Stock Repurchase Program
9 Months Ended
Sep. 30, 2019
Stock Repurchase Program [Abstract]  
Stock Repurchase Program Stock Repurchase Program
 
We repurchased and retired 8.4 million shares of Common Stock under our stock repurchase program during the first nine months of 2019, at a cost of $1.6 billion. During the first nine months of 2018, we repurchased and retired 12.8 million shares (5.7 million under an accelerated share repurchase program and 7.1 million shares under our ongoing program) at a cost of $2.1 billion.

Since the beginning of 2006, we have repurchased and retired 194.0 million shares at a total cost of $15.7 billion.