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Fair Value Measurements (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2020
Assets          
Total assets   $ 916 $ 874    
Liabilities          
Total liabilities   983 925    
Indexed debt securities derivatives transferred out of level 3       $ 668  
Estimated Fair Value of Financial Instruments          
Goodwill impairment   185 0 0  
Indiana Electric Integrated [Member]          
Estimated Fair Value of Financial Instruments          
Goodwill impairment   185      
Carrying amount [Member]          
Estimated Fair Value of Financial Instruments          
Long-term Debt, Fair Value   13,401 15,093    
Fair value [Member]          
Estimated Fair Value of Financial Instruments          
Long-term Debt, Fair Value   15,226 16,067    
Fair Value, Inputs, Level 1 [Member]          
Assets          
Total assets   916 874    
Liabilities          
Total liabilities   0 0    
Fair Value, Inputs, Level 2 [Member]          
Assets          
Total assets   0 0    
Liabilities          
Total liabilities   983 925    
Fair Value, Inputs, Level 3 [Member]          
Assets          
Total assets   0 0    
Liabilities          
Total liabilities   0 0    
Fair Value, Measurements, Recurring [Member]          
Assets          
Corporate equities   873 825    
Investments, including money market funds (1)   43 49    
Fair Value, Measurements, Recurring [Member] | IDS Derivative [Member]          
Liabilities          
Derivative Liability   953 893    
Fair Value, Measurements, Recurring [Member] | Interest Rate Contract [Member]          
Liabilities          
Derivative Liability   20 10    
Fair Value, Measurements, Recurring [Member] | Energy Related Derivative [Member]          
Liabilities          
Derivative Liability   10 22    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Assets          
Corporate equities   873 825    
Investments, including money market funds (1)   43 49    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | IDS Derivative [Member]          
Liabilities          
Gross Amounts Recognized   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member]          
Liabilities          
Gross Amounts Recognized   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Energy Related Derivative [Member]          
Liabilities          
Gross Amounts Recognized   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Assets          
Corporate equities   0 0    
Investments, including money market funds (1)   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | IDS Derivative [Member]          
Liabilities          
Gross Amounts Recognized   (953) (893)    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member]          
Liabilities          
Gross Amounts Recognized   (20) (10)    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Energy Related Derivative [Member]          
Liabilities          
Gross Amounts Recognized   (10) (22)    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Assets          
Corporate equities   0 0    
Investments, including money market funds (1)   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | IDS Derivative [Member]          
Liabilities          
Gross Amounts Recognized   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member]          
Liabilities          
Gross Amounts Recognized   0 0    
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Energy Related Derivative [Member]          
Liabilities          
Gross Amounts Recognized   0 0    
Houston Electric [Member]          
Assets          
Total assets   26 32    
Houston Electric [Member] | Carrying amount [Member]          
Estimated Fair Value of Financial Instruments          
Long-term Debt, Fair Value   5,019 4,950    
Houston Electric [Member] | Fair value [Member]          
Estimated Fair Value of Financial Instruments          
Long-term Debt, Fair Value   5,957 5,457    
Houston Electric [Member] | Fair Value, Inputs, Level 1 [Member]          
Assets          
Total assets   26 32    
Houston Electric [Member] | Fair Value, Inputs, Level 2 [Member]          
Assets          
Total assets   0 0    
Houston Electric [Member] | Fair Value, Inputs, Level 3 [Member]          
Assets          
Total assets   0 0    
Houston Electric [Member] | Fair Value, Measurements, Recurring [Member]          
Assets          
Investments, including money market funds (1)   26 32    
Houston Electric [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Assets          
Investments, including money market funds (1)   26 32    
Houston Electric [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Assets          
Investments, including money market funds (1)   0 0    
Houston Electric [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Assets          
Investments, including money market funds (1)   0 0    
CERC Corp [Member]          
Assets          
Total assets   13 13    
CERC Corp [Member] | Carrying amount [Member]          
Estimated Fair Value of Financial Instruments          
Long-term Debt, Fair Value   2,428 2,546    
CERC Corp [Member] | Fair value [Member]          
Estimated Fair Value of Financial Instruments          
Long-term Debt, Fair Value   2,855 2,803    
CERC Corp [Member] | Fair Value, Inputs, Level 1 [Member]          
Assets          
Total assets   13 13    
CERC Corp [Member] | Fair Value, Inputs, Level 2 [Member]          
Assets          
Total assets   0 0    
CERC Corp [Member] | Fair Value, Inputs, Level 3 [Member]          
Assets          
Total assets   0 0    
CERC Corp [Member] | Fair Value, Measurements, Recurring [Member]          
Assets          
Corporate equities   2 2    
Investments, including money market funds (1)   11 11    
CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Assets          
Corporate equities   2 2    
Investments, including money market funds (1)   11 11    
CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Assets          
Corporate equities   0 0    
Investments, including money market funds (1)   0 0    
CERC Corp [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Assets          
Corporate equities   0 0    
Investments, including money market funds (1)   0 0    
Infrastructure Services Disposal Group [Member]          
Estimated Fair Value of Financial Instruments          
Goodwill impairment   82      
Fair Value Of Disposal Group   864      
Energy Services [Member]          
Estimated Fair Value of Financial Instruments          
Fair Value Of Disposal Group   402,000,000      
Enable Midstream Partners [Member]          
Estimated Fair Value of Financial Instruments          
Equity Method Investment, Other than Temporary Impairment   1,541 0 0  
Equity Method Investments, Fair Value Disclosure         $ 848
Goodwill impairment   $ 28 $ 86 $ 0  
Common Units [Member] | Enable Midstream Partners [Member]          
Estimated Fair Value of Financial Instruments          
Percentage Reduction of Dividend or Distribution Amount 50.00%