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Stock Repurchase Program	6 Months Ended
Stock Repurchase Program	Jun. 30, 2019
Stock Repurchase Program [Abstract]
Stock Repurchase Program	Stock Repurchase Program We repurchased and retired 5.7 million shares and 4.8 million shares of Common Stock under our stock repurchase program in the first six months of 2019 and 2018, respectively, at a cost of $1.1 billion and $700 million, respectively. Since the beginning of 2006, we have repurchased and retired 191.3 million shares at a total cost of $15.2 billion.