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Basis of Presentation and Significant Accounting Policies Adoption of New Accounting Standards (Details) - USD ($) $ in Millions | 12 Months Ended |  |
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Dec. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019
Operating Lease, Liability |  | $ 30 | $ 29
New Accounting Pronouncement or Change in Accounting Principle, Effect of Adoption, Quantification | $ 0 |  |

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- Definition Represents the quantification of the effect of adopting the new accounting standard or change in accounting principle expected by the entity to have a significant effect on the entity's financial statements. + 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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