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Share Repurchase Programs | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Share Repurchase Programs | 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 $3,895 million of plan capacity remained available for repurchases as of December 31, 2017. 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
Year ended |  | shares purchased |  | paid per share |  | plans or programs
December 31, 2017 |  | 1 |  |  | $ | 93.24 |  |  | $ | 105 |
December 31, 2016 |  | — |  |  | $ | — |  |  | $ | — |
December 31, 2015 |  | 5 |  |  | $ | 66.10 |  |  | $ | 300 |
There were no share repurchases in 2016. During January and February 2018, we repurchased an additional 4 million shares of our common stock for $401 million at an average price of $97.70 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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