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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

X

- 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.

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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

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Amount of lessee's right to use underlying asset under operating lease.

+ References

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-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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