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Organization and Basis of Presentation Accounting (Policies) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
Basis of Accounting [Text Block] | Basis of Presentation The accompanying consolidated and combined financial statements and notes are prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP"). All intercompany transactions and balances have been eliminated. The accompanying consolidated financial statements include the accounts of JBG SMITH and our wholly owned subsidiaries and those other entities, including JBG SMITH LP, in which we have a controlling financial interest, including where we have been determined to be the primary beneficiary of a variable interest entity ("VIE"). See Note 7 for additional information on our VIEs. The portions of the equity and net income of consolidated subsidiaries that are not attributable to JBG SMITH are presented separately as amounts attributable to noncontrolling interests in our consolidated and combined financial statements. References to the financial statements refer to our consolidated and combined financial statements as of December 31, 2019 and 2018, and for each of the three years in the period ended December 31, 2019. References to our balance sheets refer to our consolidated balance sheets as of December 31, 2019 and 2018. References to our statements of operations refer to our consolidated and combined statements of operations for each of the three years in the period ended December 31, 2019. References to our statements of comprehensive income (loss) refer to our consolidated and combined statements of comprehensive income (loss) for each of the three years in the period ended December 31, 2019. References to our statements of cash flows refer to our consolidated and combined statements of cash flows for each of the three years in the period ended December 31, 2019.

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- Definition The entire disclosure for the basis of accounting, or basis of presentation, used to prepare the financial statements (for example, US Generally Accepted Accounting Principles, Other Comprehensive Basis of Accounting, IFRS). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -URI http://asc.fasb.org/topic&trid=2122369 + Details
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