Income Taxes	6 Months Ended
Nov. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	(5) Income Taxes Our effective tax rate was 20.6% for the second quarter and 22.3% for the first half of 2019, compared with 32.0% for the second quarter and 35.4% for the first half of 2018. The 2019 tax rate was favorably impacted by the TCJA, which resulted in benefits of approximately $150 million and $285 million during the second quarter and first half of 2019, respectively, primarily from the lower statutory tax rate on fiscal 2019 earnings. The 2019 tax rates were also favorably impacted by a tax benefit of approximately $60 million from accelerated deductions to be claimed on FedEx’s 2018 U.S. income tax return. The 2018 tax rate benefited from foreign tax credits associated with a dividend paid from our foreign operations and tax benefits from share-based payments. The 2018 tax rate was negatively impacted by costs incurred in connection with the integration of the foreign operations of FedEx Express and TNT Express B.V. (“TNT Express”), the effects of the NotPetya cyberattack on lower taxed foreign earnings and changes in uncertain tax positions. On August 1, 2018, the U.S. Treasury Department released proposed regulations covering the one-time transition tax on unrepatriated foreign earnings, which was enacted as part of the TCJA. Certain guidance included in these proposed regulations is inconsistent with our interpretation that led to the recognition of a $225 million ($0.94 per diluted share) benefit in 2018 (the “2018 Benefit”). Notwithstanding this inconsistency, we are confident in our interpretation and intend to defend this position through litigation, if necessary. This proposed guidance is not authoritative and is subject to change in the regulatory review process. However, if the proposed guidance is included in the final regulations as drafted or we are ultimately unsuccessful in defending our position, we may be required to reverse the 2018 Benefit. The U.S. Treasury Department has also released proposed regulations related to the business interest expense limitations, foreign tax credit guidance, base-erosion and anti-abuse tax provisions of the TCJA. This proposed guidance is not authoritative and is subject to change in the regulatory review process. We continue to review these proposed regulations and consider their potential impact on our effective tax rate. During the second quarter of 2019, we revised the provisional benefit associated with the remeasurement of our net U.S. deferred tax liability due to the corporate tax rate reduction under the TCJA. As a result, we recognized $4 million of tax expense resulting in a decrease to the $1.15 billion provisional benefit recorded in 2018. No other change to the provisional amounts recorded at May 31, 2018 has been recorded. We will continue to adjust provisional amounts for the impacts of the TCJA as more information and further guidance becomes available during the measurement period, which ends December 22, 2018.

Income Taxes

6 Months Ended

Nov. 30, 2018

(5) Income Taxes

Our effective tax rate was 20.6% for the second quarter and 22.3% for the first half of 2019, compared with 32.0% for the second quarter and 35.4% for the first half of 2018. The 2019 tax rate was favorably impacted by the TCJA, which resulted in benefits of approximately $150 million and $285 million during the second quarter and first half of 2019, respectively, primarily from the lower statutory tax rate on fiscal 2019 earnings. The 2019 tax rates were also favorably impacted by a tax benefit of approximately $60 million from accelerated deductions to be claimed on FedEx’s 2018 U.S. income tax return. The 2018 tax rate benefited from foreign tax credits associated with a dividend paid from our foreign operations and tax benefits from share-based payments. The 2018 tax rate was negatively impacted by costs incurred in connection with the integration of the foreign operations of FedEx Express and TNT Express B.V. (“TNT Express”), the effects of the NotPetya cyberattack on lower taxed foreign earnings and changes in uncertain tax positions.

On August 1, 2018, the U.S. Treasury Department released proposed regulations covering the one-time transition tax on unrepatriated foreign earnings, which was enacted as part of the TCJA. Certain guidance included in these proposed regulations is inconsistent with our interpretation that led to the recognition of a $225 million ($0.94 per diluted share) benefit in 2018 (the “2018 Benefit”). Notwithstanding this inconsistency, we are confident in our interpretation and intend to defend this position through litigation, if necessary. This proposed guidance is not authoritative and is subject to change in the regulatory review process. However, if the proposed guidance is included in the final regulations as drafted or we are ultimately unsuccessful in defending our position, we may be required to reverse the 2018 Benefit.

The U.S. Treasury Department has also released proposed regulations related to the business interest expense limitations, foreign tax credit guidance, base-erosion and anti-abuse tax provisions of the TCJA. This proposed guidance is not authoritative and is subject to change in the regulatory review process. We continue to review these proposed regulations and consider their potential impact on our effective tax rate.

During the second quarter of 2019, we revised the provisional benefit associated with the remeasurement of our net U.S. deferred tax liability due to the corporate tax rate reduction under the TCJA. As a result, we recognized $4 million of tax expense resulting in a decrease to the $1.15 billion provisional benefit recorded in 2018. No other change to the provisional amounts recorded at May 31, 2018 has been recorded. We will continue to adjust provisional amounts for the impacts of the TCJA as more information and further guidance becomes available during the measurement period, which ends December 22, 2018.