Recent Accounting Literature	6 Months Ended
Jun. 30, 2019
Recent Accounting Literature [Abstract]
Recent Accounting Literature	(2) Recent Accounting Literature: Recently Adopted Accounting Pronouncements Leases In February 2016, the FASB issued ASU No. 2016 – 02, “Leases (Topic 842).” This standard, along with its related amendments, establishes the principles to report transparent and economically neutral information about the assets and liabilities that arise from leases. Upon implementation, lessees recognize almost all leases on their balance sheet as a right-of-use asset and a lease liability. For income statement purposes, the FASB retained a dual model, requiring leases to be classified as either operating or finance. Classification is based on criteria that are largely similar to those applied in current lease accounting, but without explicit bright lines. Lessor accounting is similar to the current model but updated to align with certain changes to the lessee model and the new revenue recognition standard. Existing sale-leaseback guidance, including guidance for real estate, is replaced with a new model applicable to both lessees and lessors. Frontier adopted the new lease standard during the first quarter of 2019 using the additional transition method provided by ASU 2018 – 11, “Targeted Improvements.” Under this method, Frontier applied the requirements of the new leases standard as of January 1, 2019 and recognized a cumulative-effect adjustment of $15 million ($11 million net of tax) to accumulated deficit. Consequently, Frontier’s reporting for comparative periods will continue to be in accordance with Topic 840. Refer to Note 11 for additional lease disclosures. Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income In February 2018, the FASB issued ASU 2018-02, which allows for the reclassification of certain income tax effects related to the Tax Cuts and Jobs Act (the “Tax Act”) between “Accumulated other comprehensive income” and “Retained earnings.” This ASU relates to the requirement that adjustments to deferred tax liabilities and assets related to a change in tax laws or rates to be included in “Income from continuing operations,” even in situations where the related items were originally recognized in “Other comprehensive income.” Frontier adopted this standard as of January 1, 2019 by recording a decrease to accumulated deficit of $79 million, with a corresponding increase to Accumulated other comprehensive loss on the consolidated balance sheet and the consolidated statement of equity (deficit). Improvements to Nonemployee Share-Based Payment Accounting In June 2018, the FASB issued Accounting Standards Update (“ASU”) No. 2018-07, “Compensation — Stock Compensation (ASC 718), Improvements to Nonemployee Share-Based Payment Accounting,” which aligns the measurement and classification guidance for share-based payments to nonemployees with that for employees, with certain exceptions. Frontier adopted this standard update as of January 1, 2019, and records such awards at their grant date fair value, and the related liability is no longer remeasured in each period. The impact to our consolidated financial statements was not material. Recent Accounting Pronouncements Not Yet Adopted Financial Instrument Credit Losses In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses”, which amends the current financial statement impairment model requiring entities to use a forward-looking approach based on expected losses to estimate credit losses on certain types of financial instruments, including trade receivables. ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, with early adoption permitted. Frontier is currently evaluating the impact of adoption of this standard on our consolidated financial statements. Changes to the Disclosure Requirements for Fair Value Measurement 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 adds, removes, and modifies certain disclosures required by ASC 820. ASU 2018-13 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. Frontier is currently evaluating the impact of the adoption of this standard on our disclosures. Changes to the Disclosure Requirements for Defined Benefit Plans In August 2018, the FASB issued ASU 2018-14, "Compensation-Retirement Benefits-Defined Benefit Plans-General: Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans." This standard eliminates requirements for certain disclosures that are not considered cost beneficial, clarifies certain required disclosures and adds additional disclosures under defined benefit pension plans and other postretirement plans. We are required to adopt this guidance beginning January 1, 2021. Early adoption is permitted. The amendments in the standard would need to be applied on a retrospective basis. Frontier is currently evaluating the impact of the adoption of this standard on our disclosures.

Recent Accounting Literature

6 Months Ended

Jun. 30, 2019

Recent Accounting Literature [Abstract]

(2) Recent Accounting Literature:

Recently Adopted Accounting Pronouncements

Leases

In February 2016, the FASB issued ASU No. 2016 – 02, “Leases (Topic 842).” This standard, along with its related amendments, establishes the principles to report transparent and economically neutral information about the assets and liabilities that arise from leases. Upon implementation, lessees recognize almost all leases on their balance sheet as a right-of-use asset and a lease liability. For income statement purposes, the FASB retained a dual model, requiring leases to be classified as either operating or finance. Classification is based on criteria that are largely similar to those applied in current lease accounting, but without explicit bright lines. Lessor accounting is similar to the current model but updated to align with certain changes to the lessee model and the new revenue recognition standard. Existing sale-leaseback guidance, including guidance for real estate, is replaced with a new model applicable to both lessees and lessors.

Frontier adopted the new lease standard during the first quarter of 2019 using the additional transition method provided by ASU 2018 – 11, “Targeted Improvements.” Under this method, Frontier applied the requirements of the new leases standard as of January 1, 2019 and recognized a cumulative-effect adjustment of $15 million ($11 million net of tax) to accumulated deficit. Consequently, Frontier’s reporting for comparative periods will continue to be in accordance with Topic 840. Refer to Note 11 for additional lease disclosures.

Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income

In February 2018, the FASB issued ASU 2018-02, which allows for the reclassification of certain income tax effects related to the Tax Cuts and Jobs Act (the “Tax Act”) between “Accumulated other comprehensive income” and “Retained earnings.” This ASU relates to the requirement that adjustments to deferred tax liabilities and assets related to a change in tax laws or rates to be included in “Income from continuing operations,” even in situations where the related items were originally recognized in “Other comprehensive income.” Frontier adopted this standard as of January 1, 2019 by recording a decrease to accumulated deficit of $79 million, with a corresponding increase to Accumulated other comprehensive loss on the consolidated balance sheet and the consolidated statement of equity (deficit).

Improvements to Nonemployee Share-Based Payment Accounting

In June 2018, the FASB issued Accounting Standards Update (“ASU”) No. 2018-07, “Compensation — Stock Compensation (ASC 718), Improvements to Nonemployee Share-Based Payment Accounting,” which aligns the measurement and classification guidance for share-based payments to nonemployees with that for employees, with certain exceptions. Frontier adopted this standard update as of January 1, 2019, and records such awards at their grant date fair value, and the related liability is no longer remeasured in each period. The impact to our consolidated financial statements was not material.

Recent Accounting Pronouncements Not Yet Adopted

Financial Instrument Credit Losses

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments – Credit Losses”, which amends the current financial statement impairment model requiring entities to use a forward-looking approach based on expected losses to estimate credit losses on certain types of financial instruments, including trade receivables. ASU 2016-13 is effective for fiscal years beginning after December 15, 2019, with early adoption permitted. Frontier is currently evaluating the impact of adoption of this standard on our consolidated financial statements.

Changes to the Disclosure Requirements for Fair Value Measurement

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 adds, removes, and modifies certain disclosures required by ASC 820. ASU 2018-13 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted. Frontier is currently evaluating the impact of the adoption of this standard on our disclosures.

Changes to the Disclosure Requirements for Defined Benefit Plans

In August 2018, the FASB issued ASU 2018-14, "Compensation-Retirement Benefits-Defined Benefit Plans-General: Disclosure Framework-Changes to the Disclosure Requirements for Defined Benefit Plans." This standard eliminates requirements for certain disclosures that are not considered cost beneficial, clarifies certain required disclosures and adds additional disclosures under defined benefit pension plans and other postretirement plans. We are required to adopt this guidance beginning January 1, 2021. Early adoption is permitted. The amendments in the standard would need to be applied on a retrospective basis. Frontier is currently evaluating the impact of the adoption of this standard on our disclosures.