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Share Repurchase Program | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Share Repurchase Program | Share Repurchase Program Our Board of Directors has approved a series of plans authorizing repurchases of our common stock in the open market at prevailing market prices or in privately negotiated transactions, the most current of which on July 20, 2017, authorized repurchases of up to $4.0 billion through December 31, 2020. This share repurchase authorization replaced any existing share repurchase authorization plan. Approximately $3.3 billion of plan capacity remained available for repurchases as of June 30, 2018. The table below summarizes annual share repurchase activity under these plans (in millions, except per share amounts):
|  |  |  |  |  | Total cost of shares
|  |  |  |  |  | purchased as part of
|  | Total number of |  | Average price |  | publicly announced
Three months ended |  | shares purchased |  | paid per share |  | plans or programs
June 30, 2018 |  | 2.1 |  |  | $ | 95.83 |  |  | $ | 200 |
March 31, 2018 |  | 4.1 |  |  | $ | 97.70 |  |  | $ | 401 |
December 31, 2017 |  | 1.1 |  |  | $ | 93.24 |  |  | $ | 105 |
During July 2018, we repurchased an additional 1.9 million shares of our common stock for $200 million at an average price of $107.37 per share.

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- Definition The entire disclosure for treasury stock, including, but not limited to, average cost per share, description of share repurchase program, shares repurchased, shares held for each class of treasury stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -URI http://asc.fasb.org/subtopic&trid=2208821 + Details
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