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Loans, borrowings, leases, cash and cash equivalents and short-term investments - Funding (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Jul. 31, 2020
Disclosure of detailed information about borrowings [line items]    
Notional amount $ 1,296,000,000  
Guaranteed notes due July 2030    
Disclosure of detailed information about borrowings [line items]    
Notional amount $ 1,500.000 $ 1,500,000,000
Coupon rate 3.75%  
Principal amount sold (as a percent) 99.176%  
Guaranteed notes due July 2030 | The Export-Import Bank of China    
Disclosure of detailed information about borrowings [line items]    
Notional amount $ 300,000,000