| **Earnings Per Share - (Details) - shares shares in Millions**                                                                                                                                                                                                                                                                                                                                                                                                                         | 3 Months Ended | 6 Months Ended |
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| **Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                               |                |           |   |   |   |
| Weighted average common shares outstanding for basic and diluted loss per share                                                                                                                                                                                                                                                                                                                                                                                                        |                | 438            | 438 | 440 | 438 |
| Anti-dilutive shares excluded from diluted loss per share (1)                                                                                                                                                                                                                                                                                                                                                                                                                          |                |           |   |   |   |
| **Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                               |                |           |   |   |   |
| Anti-dilutive shares excluded from diluted loss per share (1)                                                                                                                                                                                                                                                                                                                                                                                                                          | [1]            | 1              | 2 | 1 | 2 |
| Future potentially dilutive shares excluded from diluted loss per share (2)                                                                                                                                                                                                                                                                                                                                                                                                            |                |           |   |   |   |
| **Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]**                                                                                                                                                                                                                                                                                                                                                                                               |                |           |   |   |   |
| Earnings Per Share, Potentially Dilutive Securities                                                                                                                                                                                                                                                                                                                                                                                                                                    | [2]            | 6              | 2 | 7 | 2 |
|                                                                                                                                                                                                                                                                                                                                                                                                                                                                                        |
| [1]The calculation of diluted loss per share for both the three and six months ended June 30, 2016 excludes shares potentially issuable under stock-based incentive compensation plans and the employee stock purchase plan, as their effect, if included, would have been anti-dilutive.[2]Options where the exercise price exceeds the average market price are excluded from the calculation of diluted net loss or earnings per share because their effect would be anti-dilutive. |

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| - Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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| - Definition
Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would have been antidilutive for the period presented.
+ References
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| - Definition
Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.
+ References
Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1448-109256Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Weighted-Average Number of Common Shares Outstanding -URI http://asc.fasb.org/extlink&oid=6528421
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