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Stock-Based Compensation (Details) - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Number of common shares reserved for issuance |  |  |  |  |  |  |
Total stock-based compensation expense | $ 19 | $ 30 | $ 37 | $ 47 | $ 100 | $ 96 | $ 90
Shares available for granting under the 2002 plan (in shares) |  |  |  |  | 31.4 | 30.3 |
Options outstanding (in shares) |  |  |  |  | 8.1 | 12.2 |
Total shares reserved for issuance (in shares) |  |  |  |  | 39.5 | 42.5 |
Employee Stock [Member] |  |  |  |  |  |  |
Number of common shares reserved for issuance |  |  |  |  |  |  |
Unrecognized compensation expense | 6 |  | 6 |  |  |  |
Total stock-based compensation expense | 3 | 6 | 9 | 9 |  |  |
Restricted Stock [Member] |  |  |  |  |  |  |
Number of common shares reserved for issuance |  |  |  |  |  |  |
Total stock-based compensation expense | $ 16 | $ 24 | $ 28 | $ 38 |  |  |
Director Deferred Stock Ownership Plan [Member] |  |  |  |  |  |  |
Number of common shares reserved for issuance |  |  |  |  |  |  |
Total shares reserved for issuance (in shares) |  |  |  |  | 0.1 |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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