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Summary of Significant Accounting Policies Property, Plant and Equipment (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019
Building |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 30 years |
Leasehold Improvements | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 20 years |
Furniture and Fixtures | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 3 years |
Furniture and Fixtures | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 7 years |
Software |  |
Property, Plant and Equipment [Line Items] |  |
Capitalized Computer Software, Net | $ 118 | $ 118
Software | Minimum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 1 year |
Software | Maximum |  |
Property, Plant and Equipment [Line Items] |  |
Property, Plant and Equipment, Useful Life | 5 years |

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- Definition The carrying amount of capitalized computer software costs net of accumulated amortization as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 985 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6501960&loc=d3e128462-111756 + Details
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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. + Details
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- Definition 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. + References No definition available. + Details
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- Details
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- Details
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- Details
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- Details
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