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Loans - Additional Information (Detail)
$ in Millions
 12 Months Ended
Jul. 31, 2020
USD ($)
Jul. 13, 2020
USD ($)
Jul. 02, 2020
USD ($)
Mar. 23, 2016
USD ($)
Dec. 31, 2020
ARS ($)
Dec. 31, 2020
USD ($)
Jan. 07, 2021
USD ($)
Aug. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Apr. 28, 2017
USD ($)
Disclosure of detailed information about loans [line items]                    
GainLossesFrom from debt exchange [1]         $ (2,097)          
Negotiable Obligations [member]                    
Disclosure of detailed information about loans [line items]                    
Percentage of discounted present value of the remaining cash flows         10.00% 10.00%        
GainLossesFrom from debt exchange           $ 2,097        
ClassXIII NO [Member]                    
Disclosure of detailed information about loans [line items]                    
Payment of cash for debt note exchange $ 90,000,000 $ 125                
Notes and debentures issued   1,000           $ 542,800,000    
ClassXLVII NO [Member]                    
Disclosure of detailed information about loans [line items]                    
Borrowings, maturity 58.73                  
Notional amount $ 587,300,000                  
currency US [Member] | ClassXIII NO [Member]                    
Disclosure of detailed information about loans [line items]                    
Borrowings, maturity     2025              
Notional amount     $ 950,000,000              
Payment of cash for debt note exchange     100              
currency US [Member] | ClassXLVII NO [Member]                    
Disclosure of detailed information about loans [line items]                    
Borrowings, maturity       2021            
Notional amount       $ 1,000,000,000            
Notes and debentures issued     $ 1,000              
Frequent Issuer regime [member]                    
Disclosure of detailed information about loans [line items]                    
Principal value             $ 6,500,000,000   $ 2,000,000,000  
Top of range [member] | ClassXIII NO [Member]                    
Disclosure of detailed information about loans [line items]                    
Notional amount   $ 925,000,000                
Top of range [member] | currency US [Member] | ClassXIII NO [Member]                    
Disclosure of detailed information about loans [line items]                    
Borrowings, interest rate     8.50%              
Top of range [member] | Medium Term Notes [member]                    
Disclosure of detailed information about loans [line items]                    
Notes and debentures issued                   $ 10,000,000,000
[1] See Note 20.