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CONDENSED FINANCIAL INFORMATION OF PARENT - Long-Term Debt (Details)
Apr. 09, 2020
USD ($)
May 16, 2019
USD ($)
Jul. 19, 2023
USD ($)
Dec. 31, 2021
placement
Dec. 14, 2020
USD ($)
Dec. 31, 2017
USD ($)
Intragroup Green Loan | Subordinated Debt            
Debt Instrument [Line Items]            
Debt instrument principal amount     $ 800,000,000      
Weighted-average interest rate     5.45%      
AVANGRID | 3.15% Notes due 2024            
Debt Instrument [Line Items]            
Debt instrument principal amount           $ 600,000,000
Interest rate           3.15%
AVANGRID | 3.80% Notes due 2029            
Debt Instrument [Line Items]            
Debt instrument principal amount   $ 750,000,000        
Interest rate   3.80%        
Proceeds from non-current debt   $ 743,000,000        
AVANGRID | Unsecured Notes Maturing in 2025            
Debt Instrument [Line Items]            
Debt instrument principal amount $ 750,000,000          
Interest rate 3.20%          
Proceeds from non-current debt $ 744,000,000          
AVANGRID | Iberdrola Loan | Subordinated Debt            
Debt Instrument [Line Items]            
Debt instrument principal amount         $ 3,000,000,000  
Sale of stock, number of placements | placement       2