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Short-term Borrowings and Long-term Debt - Debt Transactions (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Jun. 30, 2022
May 27, 2022
General Mortgage Bonds | Houston Electric      
Debt Instrument [Line Items]      
Aggregate Principal Amount $ 800 $ 800  
Senior Notes | CERC      
Debt Instrument [Line Items]      
Aggregate Principal Amount 500 500  
Senior Note and GMBs      
Debt Instrument [Line Items]      
Aggregate Principal Amount 1,300 1,300  
General Mortgage Bonds Due 2031 | General Mortgage Bonds | Houston Electric      
Debt Instrument [Line Items]      
Aggregate Principal Amount $ 300 $ 300  
Interest rate of debt (as a percent) 3.00% 3.00%  
General Mortgage Bonds Due 2051 | General Mortgage Bonds | Houston Electric      
Debt Instrument [Line Items]      
Aggregate Principal Amount $ 500 $ 500  
Interest rate of debt (as a percent) 3.60% 3.60%  
CERC Senior Notes. 4.40% due 2031 | Senior Notes | CERC      
Debt Instrument [Line Items]      
Aggregate Principal Amount $ 500 $ 500  
Interest rate of debt (as a percent) 4.40% 4.40%  
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees   $ 495  
General Mortgage Bonds Due 2031 and 2051 | General Mortgage Bonds | Houston Electric      
Debt Instrument [Line Items]      
Proceeds from issuance of long-term debt, net of discounts and issuance expenses and fees   $ 784  
CERC Corp. senior notes | CERC      
Debt Instrument [Line Items]      
Aggregate Principal Amount     $ 302
VUH PPNs | VUHI      
Debt Instrument [Line Items]      
Aggregate Principal Amount     $ 302
VUHI PPNs | VUHI      
Debt Instrument [Line Items]      
Repayments of Debt $ 302