Basis of Presentation and Summary of Significant Accounting Policies (Policies)	9 Months Ended
Sep. 30, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. The condensed consolidated balance sheet as of December 31, 2018 included herein was derived from the audited consolidated financial statements as of that date but does not include all of the information and notes required by GAAP for complete financial statements. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the audited consolidated financial statements and the related notes thereto as of and for the year ended December 31, 2018, included in the Company’s final prospectus filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, as amended (“the Securities Act”), on May 13, 2019 (“the Prospectus”). In the opinion of management, these financial statements include all adjustments, which are of a normal recurring nature, necessary for a fair statement of the financial position, results of operations, cash flows and the change in equity for the periods presented. There have been no changes to the Company’s significant accounting policies described in the Prospectus that have had a material impact on the Company’s condensed consolidated financial statements and related notes, except for the adoption of the new accounting standard related to lease accounting.
Basis of Consolidation	Basis of Consolidation The condensed consolidated financial statements of the Company include the accounts of the Company and entities consolidated under the variable interest and voting models. All intercompany balances and transactions have been eliminated. Refer to Note 16 - Variable Interest Entities ("VIEs") for further information.
Use of Estimates	Use of Estimates The preparation of the Company’s unaudited condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions, which affect the reported amounts in the financial statements and accompanying notes. Estimates are based on historical experience, where applicable, and other assumptions which management believes are reasonable under the circumstances. On an ongoing basis, the Company evaluates its estimates, including those related to the incremental borrowing rate (“IBR”) applied in lease accounting, accounts receivable allowances, fair values of investments and other financial instruments, useful lives of amortizable long-lived assets and intangible assets, stock-based compensation, income and non-income taxes, insurance reserves, and contingent liabilities. These estimates are inherently subject to judgment and actual results could differ from those estimates.
Leases	Leases The Company accounts for leases in accordance with Accounting Standards Codification (“ASC “) 842, Leases (“ASC 842”), which requires lessees to recognize leases on-balance sheet and disclose key information about leasing arrangements. The Company adopted ASC 842 along with all subsequent ASU clarifications and improvements that are applicable to the Company, on January 1, 2019, using the modified retrospective transition method and used the effective date as the date of initial application. Consequently, financial information is not updated and the disclosures required under ASC 842 are not provided for dates and periods before January 1, 2019. ASC 842 provides a number of optional practical expedients in transition. The Company elected the “package of practical expedients,” which permits the Company not to reassess under ASC 842 its prior conclusions about lease identification, lease classification and initial direct costs. The Company also made a policy election not to separate non-lease components from lease components, therefore, it accounts for lease and non-lease components as a single lease component. The Company determines if a contract contains a lease based on whether it has the right to obtain substantially all of the economic benefits from the use of an identified asset and whether it has the right to direct the use of an identified asset in exchange for consideration, which relates to an asset which the Company does not own. Right of use (“ROU”) assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. ROU assets are recognized as the lease liability, adjusted for lease incentives received. Lease liabilities are recognized at the present value of the future lease payments at the lease commencement date. The interest rate used to determine the present value of the future lease payments is the Company’s IBR, because the interest rate implicit in most of the Company’s leases is not readily determinable. The IBR is a hypothetical rate based on the Company’s understanding of what its credit rating would be to borrow and resulting interest the Company would pay to borrow an amount equal to the lease payments in a similar economic environment over the lease term on a collateralized basis. Lease payments may be fixed or variable, however, only fixed payments or in-substance fixed payments are included in the Company’s lease liability calculation. Variable lease payments are recognized in operating expenses in the period in which the obligation for those payments are incurred. The lease term of operating and finance leases vary from less than a year to 76 years. The Company has leases that include one or more options to extend the lease term for up to 14 years as well as options to terminate the lease within one year. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise such options. Operating leases are included in operating lease right-to-use assets, operating lease liabilities, current and operating lease liabilities, non-current on the Company’s condensed consolidated balance sheets. Finance leases are included in property and equipment, net, accrued and other current liabilities, and other long-term liabilities on the Company’s condensed consolidated balance sheets. As of September 30, 2019, less than 11% of the Company’s ROU assets were generated from leased assets outside of the U.S.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents as of September 30, 2019 consisted of cash held in checking and savings accounts as well as investments in money market funds. The Company considers all highly-liquid investments purchased with an original or remaining maturity of three months or less at the date of purchase to be cash equivalents. Cash includes amounts collected on behalf of, but not yet remitted to Partners, which are included in accrued and other current liabilities on the consolidated balance sheets.
Recent Accounting Pronouncements	Recently Adopted Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which requires lessees to recognize leases on-balance sheet and disclose key information about leasing arrangements. Upon adoption of the new leasing standard on January 1, 2019, the Company recognized ROU assets of $888 million and lease liabilities of $963 million. The Company reassessed the build-to-suit leases that no longer meet the control-based build-to-suit model and derecognized $392 million in build-to-suit assets, $350 million corresponding financing obligation, and recorded $9 million of deferred tax liability. The initial cash contribution to the Mission Bay 3 & 4 joint venture that was previously reported as a defeasance of a build-to-suit financing obligation of $60 million was derecognized by reclassifying it as an increase to the Mission Bay 3 & 4 equity method investment. The $9 million difference between the total derecognized assets and total derecognized liabilities was recorded in the opening balance of accumulated deficit, net of tax, as of January 1, 2019. In July 2017, the FASB issued ASU 2017-11, “Earnings Per Share (Topic 260); Distinguishing Liabilities from Equity (Topic 480); Derivatives and Hedging (Topic 815): (Part I) Accounting for Certain Financial Instruments with Down Round Features, (Part II) Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling Interests with a Scope Exception” to simplify the accounting for certain instruments with down round features. The amendments require companies to disregard the down round feature when assessing whether the instrument is indexed to its own stock, for purposes of determining liability or equity classification. Further, companies that provide earnings per share (“EPS”) data will adjust the basic EPS calculation for the effect of the feature when triggered and will also recognize the effect of the trigger within equity. The Company adopted this new standard as of January 1, 2019 and applied the changes retrospectively. The adoption of the new standard did not have a material impact on the Company’s condensed consolidated financial statements. In June 2018, the FASB issued ASU 2018-07, “Improvements to Non-Employee Share-Based Payment Accounting,” which expands the scope of Topic 718, to include share-based payments issued to non-employees for goods or services. The new standard supersedes Subtopic 505-50. The Company adopted the new standard effective January 1, 2019 on a modified retrospective basis. The new standard did not have a material impact on the Company’s condensed consolidated financial statements. In November 2018, the FASB issued ASU 2018-18, "Collaborative arrangements: Clarifying the interaction between Topic 808 and Topic 606" to clarify the interaction between the accounting guidance for collaborative arrangements and revenue from contracts with customers. The Company early adopted this guidance effective July 1, 2019 on a retrospective basis and only applied it to contracts that were incomplete as of the adoption date. The new standard did not have a material impact on the Company's condensed consolidated financial statements for the current or previous reported periods herein. Recently Issued Accounting Pronouncements Not Yet Adopted In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” to require the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. The standard also amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. The standard is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement,” which modifies the disclosure requirements in ASC 820, “Fair Value Measurement” (“ASC 820”). The new standard is effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. An entity is permitted to early adopt any removed or modified disclosures upon issuance of this ASU and delay adoption of the additional disclosures until their effective date. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements. In August 2018, the FASB issued ASU 2018-15, “Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract,” which aligns the requirements for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use-software. The standard is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements. In October 2018, the FASB issued ASU 2018-17, “Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities,” which amends the guidance for determining whether a decision-making fee is a variable interest and requires organizations to consider indirect interests held through related parties under common control on a proportional basis rather than as the equivalent of a direct interest in its entirety. The standard is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements.
Non-Controlling Interest	The redeemable non-controlling interests are classified in mezzanine equity as each are redeemable on an event that is not solely in the control of the Company. The redeemable non-controlling interests are reported at the greater of redemption amount or initial investment amount and remeasured to fair value each reporting period with changes in the carrying value recognized in additional paid-in capital when it is probable that each will become redeemable. The minority stockholders ownership in Freight Holding is not remeasured to fair value because it is currently not probable that the Preferred Units will become redeemable.

Basis of Presentation and Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. The condensed consolidated balance sheet as of December 31, 2018 included herein was derived from the audited consolidated financial statements as of that date but does not include all of the information and notes required by GAAP for complete financial statements. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, the information included in this Quarterly Report on Form 10-Q should be read in conjunction with the audited consolidated financial statements and the related notes thereto as of and for the year ended December 31, 2018, included in the Company’s final prospectus filed with the SEC pursuant to Rule 424(b) under the Securities Act of 1933, as amended (“the Securities Act”), on May 13, 2019 (“the Prospectus”).

In the opinion of management, these financial statements include all adjustments, which are of a normal recurring nature, necessary for a fair statement of the financial position, results of operations, cash flows and the change in equity for the periods presented.

There have been no changes to the Company’s significant accounting policies described in the Prospectus that have had a material impact on the Company’s condensed consolidated financial statements and related notes, except for the adoption of the new accounting standard related to lease accounting.

Basis of Consolidation

The condensed consolidated financial statements of the Company include the accounts of the Company and entities consolidated under the variable interest and voting models. All intercompany balances and transactions have been eliminated. Refer to Note 16 - Variable Interest Entities ("VIEs") for further information.

Use of Estimates

The preparation of the Company’s unaudited condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions, which affect the reported amounts in the financial statements and accompanying notes. Estimates are based on historical experience, where applicable, and other assumptions which management believes are reasonable under the circumstances. On an ongoing basis, the Company evaluates its estimates, including those related to the incremental borrowing rate (“IBR”) applied in lease accounting, accounts receivable allowances, fair values of investments and other financial instruments, useful lives of amortizable long-lived assets and intangible assets, stock-based compensation, income and non-income taxes, insurance reserves, and contingent liabilities. These estimates are inherently subject to judgment and actual results could differ from those estimates.

Leases

The Company accounts for leases in accordance with Accounting Standards Codification (“ASC “) 842, Leases (“ASC 842”), which requires lessees to recognize leases on-balance sheet and disclose key information about leasing arrangements. The Company adopted ASC 842 along with all subsequent ASU clarifications and improvements that are applicable to the Company, on January 1, 2019, using the modified retrospective transition method and used the effective date as the date of initial application. Consequently, financial information is not updated and the disclosures required under ASC 842 are not provided for dates and periods before January 1, 2019. ASC 842 provides a number of optional practical expedients in transition. The Company elected the “package of practical expedients,” which permits the Company not to reassess under ASC 842 its prior conclusions about lease identification, lease classification and initial direct costs. The Company also made a policy election not to separate non-lease components from lease components, therefore, it accounts for lease and non-lease components as a single lease component.

The Company determines if a contract contains a lease based on whether it has the right to obtain substantially all of the economic benefits from the use of an identified asset and whether it has the right to direct the use of an identified asset in exchange for consideration, which relates to an asset which the Company does not own. Right of use (“ROU”) assets represent the Company’s right to use an underlying asset for the lease term and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. ROU assets are recognized as the lease liability, adjusted for lease incentives received. Lease liabilities are recognized at the present value of the future lease payments at the lease commencement date. The interest rate used to determine the present value of the future lease payments is the Company’s IBR, because the interest rate implicit in most of the Company’s leases is not readily determinable. The IBR is a hypothetical rate based on the Company’s understanding of what its credit rating would be to borrow and resulting interest the Company would pay to borrow an amount equal to the lease payments in a similar economic environment over the lease term on a collateralized basis. Lease payments may be fixed or variable, however, only fixed payments or in-substance fixed payments are included in the Company’s lease liability calculation. Variable lease payments are recognized in operating expenses in the period in which the obligation for those payments are incurred.

The lease term of operating and finance leases vary from less than a year to 76 years. The Company has leases that include one or more options to extend the lease term for up to 14 years as well as options to terminate the lease within one year. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise such options.

Operating leases are included in operating lease right-to-use assets, operating lease liabilities, current and operating lease liabilities, non-current on the Company’s condensed consolidated balance sheets. Finance leases are included in property and equipment, net, accrued and other current liabilities, and other long-term liabilities on the Company’s condensed consolidated balance sheets. As of September 30, 2019, less than 11% of the Company’s ROU assets were generated from leased assets outside of the U.S.

Cash and Cash Equivalents

Cash and cash equivalents as of September 30, 2019 consisted of cash held in checking and savings accounts as well as investments in money market funds. The Company considers all highly-liquid investments purchased with an original or remaining maturity of three months or less at the date of purchase to be cash equivalents. Cash includes amounts collected on behalf of, but not yet remitted to Partners, which are included in accrued and other current liabilities on the consolidated balance sheets.

Recent Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In February 2016, the FASB issued ASU 2016-02, “Leases (Topic 842),” which requires lessees to recognize leases on-balance sheet and disclose key information about leasing arrangements.

Upon adoption of the new leasing standard on January 1, 2019, the Company recognized ROU assets of $888 million and lease liabilities of $963 million. The Company reassessed the build-to-suit leases that no longer meet the control-based build-to-suit model and derecognized $392 million in build-to-suit assets, $350 million corresponding financing obligation, and recorded $9 million of deferred tax liability. The initial cash contribution to the Mission Bay 3 & 4 joint venture that was previously reported as a defeasance of a build-to-suit financing obligation of $60 million was derecognized by reclassifying it as an increase to the Mission Bay 3 & 4 equity method investment. The $9 million difference between the total derecognized assets and total derecognized liabilities was recorded in the opening balance of accumulated deficit, net of tax, as of January 1, 2019.

In July 2017, the FASB issued ASU 2017-11, “Earnings Per Share (Topic 260); Distinguishing Liabilities from Equity (Topic 480); Derivatives and Hedging (Topic 815): (Part I) Accounting for Certain Financial Instruments with Down Round Features, (Part II) Replacement of the Indefinite Deferral for Mandatorily Redeemable Financial Instruments of Certain Nonpublic Entities and Certain Mandatorily Redeemable Noncontrolling Interests with a Scope Exception” to simplify the accounting for certain instruments with down round features. The amendments require companies to disregard the down round feature when assessing whether the instrument is indexed to its own stock, for purposes of determining liability or equity classification. Further, companies that provide earnings per share (“EPS”) data will adjust the basic EPS calculation for the effect of the feature when triggered and will also recognize the effect of the trigger within equity. The Company adopted this new standard as of January 1, 2019 and applied the changes retrospectively. The adoption of the new standard did not have a material impact on the Company’s condensed consolidated financial statements.

In June 2018, the FASB issued ASU 2018-07, “Improvements to Non-Employee Share-Based Payment Accounting,” which expands the scope of Topic 718, to include share-based payments issued to non-employees for goods or services. The new standard supersedes Subtopic 505-50. The Company adopted the new standard effective January 1, 2019 on a modified retrospective basis. The new standard did not have a material impact on the Company’s condensed consolidated financial statements.

In November 2018, the FASB issued ASU 2018-18, "Collaborative arrangements: Clarifying the interaction between Topic 808 and Topic 606" to clarify the interaction between the accounting guidance for collaborative arrangements and revenue from contracts with customers. The Company early adopted this guidance effective July 1, 2019 on a retrospective basis and only applied it to contracts that were incomplete as of the adoption date. The new standard did not have a material impact on the Company's condensed consolidated financial statements for the current or previous reported periods herein.

Recently Issued Accounting Pronouncements Not Yet Adopted

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments” to require the measurement of all expected credit losses for financial assets held at the reporting date based on historical experience, current conditions, and reasonable and supportable forecasts. The standard also amends the accounting for credit losses on available-for-sale debt securities and purchased financial assets with credit deterioration. The standard is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement,” which modifies the disclosure requirements in ASC 820, “Fair Value Measurement” (“ASC 820”). The new standard is effective for all entities for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. An entity is permitted to early adopt any removed or modified

disclosures upon issuance of this ASU and delay adoption of the additional disclosures until their effective date. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements.

In August 2018, the FASB issued ASU 2018-15, “Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract,” which aligns the requirements for capitalizing implementation costs incurred in a cloud computing arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use-software. The standard is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements.

In October 2018, the FASB issued ASU 2018-17, “Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities,” which amends the guidance for determining whether a decision-making fee is a variable interest and requires organizations to consider indirect interests held through related parties under common control on a proportional basis rather than as the equivalent of a direct interest in its entirety. The standard is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019. Early adoption is permitted. The Company is currently evaluating the impact of this accounting standard update on its consolidated financial statements.

Non-Controlling Interest

The redeemable non-controlling interests are classified in mezzanine equity as each are redeemable on an event that is not solely in the control of the Company. The redeemable non-controlling interests are reported at the greater of redemption amount or initial investment amount and remeasured to fair value each reporting period with changes in the carrying value recognized in additional paid-in capital when it is probable that each will become redeemable. The minority stockholders ownership in Freight Holding is not remeasured to fair value because it is currently not probable that the Preferred Units will become redeemable.