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General - Additional Information (Details)
$ / shares in Units, € in Millions
 3 Months Ended 6 Months Ended
Nov. 30, 2020
USD ($)
$ / shares
shares
Nov. 30, 2019
USD ($)
air-craft
$ / shares
Nov. 30, 2020
USD ($)
$ / shares
shares
Nov. 30, 2019
USD ($)
shares
Nov. 30, 2020
EUR (€)
shares
May 31, 2020
USD ($)
Jan. 26, 2016
shares
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Gross contract assets related to in-transit shipments $ 701,000,000   $ 701,000,000     $ 563,000,000  
Contract assets net of deferred unearned revenue 499,000,000   499,000,000     456,000,000  
Contract liabilities related to advance payments from customers 9,000,000   9,000,000     $ 10,000,000  
Number of aircraft to be permanently retired from service | air-craft   10          
Number of aircraft engines to be permanently retired from service | air-craft   12          
Noncash impairment charges   $ 66,000,000          
Noncash impairment charges net of tax   $ 50,000,000          
Noncash impairment charges net of tax per diluted share | $ / shares   $ 0.19          
Stock-based compensation $ 46,000,000 $ 37,000,000 $ 121,000,000 $ 104,000,000      
Denominated debt as a net investment hedge | €         € 640    
Stock repurchase program number of shares authorized to be repurchased | shares             25,000,000
Number of shares repurchased | shares     0 20,000.00      
Stock repurchase program, remaining number of shares authorized to be repurchased | shares 5,100,000   5,100,000   5,100,000    
Dividends payable, date declared     Nov. 20, 2020        
Dividends payable amount per share | $ / shares $ 0.65   $ 0.65        
Dividends payable, date to be paid     Dec. 28, 2020        
Dividends payable, date of record     Dec. 14, 2020        
Amended and Restated Five-Year Credit Agreement [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Line of credit facility maximum borrowing capacity $ 2,000,000,000.0   $ 2,000,000,000.0        
Line of credit facility, term     5 years        
Amended and Restated 364-Day Credit Agreement [Member]              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Line of credit facility maximum borrowing capacity $ 1,500,000,000   $ 1,500,000,000        
Line of credit facility, term     364 days        
ASU 2016-13              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Change in accounting principle, ASU adopted true   true   true    
Change in accounting principle, ASU adoption date Jun. 01, 2020   Jun. 01, 2020   Jun. 01, 2020    
Change in accounting principle, ASU immaterial effect true   true   true    
ASU 2018-15              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Change in accounting principle, ASU adopted true   true   true    
Change in accounting principle, ASU adoption date Jun. 01, 2020   Jun. 01, 2020   Jun. 01, 2020    
Change in accounting principle, ASU immaterial effect true   true   true    
ASU 2019-12              
Organization Consolidation And Presentation Of Financial Statements [Line Items]              
Change in accounting principle, ASU adopted true   true   true    
Change in accounting principle, ASU adoption date Jun. 01, 2020   Jun. 01, 2020   Jun. 01, 2020    
Change in accounting principle, ASU immaterial effect true   true   true