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Business and Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 segment | Jan. 01, 2019 USD ($)
Fixed Assets |  |
Number of operating segments | segment | 1 |
ASU 2016-02 | Scenario, Forecast |  |
Fixed Assets |  |
Lease liability |  | $ 200
Right-of-use asset |  | $ 200
Equipment | Minimum |  |
Fixed Assets |  |
Estimated useful lives of office equipment, furniture and fixtures | 3 years |
Equipment | Maximum |  |
Fixed Assets |  |
Estimated useful lives of office equipment, furniture and fixtures | 10 years |
Computer software | Minimum |  |
Fixed Assets |  |
Estimated useful lives of office equipment, furniture and fixtures | 3 years |
Computer software | Maximum |  |
Fixed Assets |  |
Estimated useful lives of office equipment, furniture and fixtures | 5 years |
Buildings | Maximum |  |
Fixed Assets |  |
Estimated useful lives of office equipment, furniture and fixtures | 39 years |

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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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