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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2016
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based compensation | Stock-based compensation for the three months ended March 31 is as follows:
(in millions) | 2016 |  | 2015
Stock option expense 1 | $ | 2 |  |  | $ | 6 |
Restricted stock and unit awards expense | 12 |  |  | 12 |
Total stock-based compensation expense | $ | 14 |  |  | $ | 18 |
1 | There were a minimal amount of stock options granted in 2015. During 2015, the Company stopped granting stock options.

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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