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Share Repurchase Programs (Tables) | 12 Months Ended
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Dec. 31, 2017
Equity [Abstract] |
Summary of Annual Stock Repurchased | 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 |

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- Definition Tabular disclosure of 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 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23315-112656 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23309-112656 + Details
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