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Income Taxes - Schedule of Reconciliation of Total Income Tax Expense and Amount Computed by Statutory Federal Income Tax Rate to Income Before Taxes (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
May 31, 2018
Feb. 28, 2018
Nov. 30, 2017
May 31, 2018
May 31, 2017
May 31, 2016
Income Tax Expense Benefit Continuing Operations Income Tax Reconciliation [Abstract]            
Taxes computed at federal statutory rate       $ 1,271 $ 1,603 $ 959
Goodwill impairment charge       109    
State and local income taxes, net of federal benefit       119 99 33
Foreign operations       43 (19) (50)
Corporate structuring transactions $ 255     (255) [1] (68) [1] (76) [1]
Tax Cuts and Jobs Act [2]       (1,357)    
Foreign tax credits from distributions $ (133) $ (12) $ (80) (225)    
Uncertain tax positions       86    
TNT Express integration and acquisition costs       20 25 40
Other, net [3]       (30) (58) 14
Provision for Income Taxes, Total       $ (219) $ 1,582 $ 920
Effective Tax Rate       (5.00%) 34.60% 33.60%
[1] The 2018 and 2017 net benefits consist of foreign deferred tax benefits of $434 million and $94 million, respectively, which were partially offset by U.S. deferred tax expenses of $179 million and $26 million, respectively.
[2] Primary components are a $1.15 billion benefit from the remeasurement of our net U.S. deferred tax liability and a $204 million one-time benefit from a contribution to our U.S. Pensions Plans in February 2018.
[3] Includes benefits from share-based payments of $60 million and $55 million in 2018 and 2017, respectively.