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Restructuring Restructuring Other Related Charges (Details) $ in Millions | 12 Months Ended | 24 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 Employee
Other Related Charges [Abstract] |  |  |
Other Nonrecurring Expense |  | $ 7 |
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost |  | $ 2 |
Charges related to voluntary termination program | $ 16 |  |
Charges related to voluntary termination program, Number of Positions Eliminated | Employee |  |  | 358

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- Definition Amount of other expense that is infrequent in occurrence or unusual in nature. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=114868883&loc=SL114871943-224233 + Details
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- Definition Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. + References No definition available. + Details
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