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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-based compensation | Stock-based compensation for the periods ended June 30 is as follows:
(in millions) | Three Months |  | Six Months
| 2017 |  | 2016 |  | 2017 |  | 2016
Stock option expense | $ | — |  |  | $ | 2 |  |  | $ | 2 |  |  | $ | 4 |
Restricted stock and unit awards expense | 21 |  |  | 18 |  |  | 39 |  |  | 30 |
Total stock-based compensation expense | $ | 21 |  |  | $ | 20 |  |  | $ | 41 |  |  | $ | 34 |

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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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