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Commitments and contingencies - Commitments (Details)
€ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Nov. 29, 2014
aircraft
Dec. 31, 2020
aircraft
Apr. 30, 2018
aircraft
Sep. 30, 2014
aircraft
Mar. 31, 2021
USD ($)
Mar. 31, 2021
EUR (€)
$ / €
Commitments and contingencies            
Aircraft standard list price | $         $ 102.5  
Exchange rate | $ / €           1.1725
Contract 2014            
Commitments and contingencies            
Purchase Obligations | €           € 7,752
Contract 2014 | Less than one year            
Commitments and contingencies            
Purchase Obligations | €           1,801
Contract 2014 | Later than one year and not later than two years            
Commitments and contingencies            
Purchase Obligations | €           5,063
Contract 2014 | Later than two years and not later than five years [member]            
Commitments and contingencies            
Purchase Obligations | €           € 888
Entering into significant commitments or contingent liabilities | Contract 2014            
Commitments and contingencies            
The number of additional aircraft agreed to purchase 10          
Number of aircraft, firm order     135 100    
Number of aircraft subject to option   75 75 100    
Number of aircrafts converted in to firm order     25      
Period prior to delivery of aircraft         2 years  
Entering into significant commitments or contingent liabilities | Maximum | Contract 2014            
Commitments and contingencies            
Number of aircraft agreed to purchase 210 210   200