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Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Assets          
Assets, Fair Value Disclosure $ 803   $ 803   $ 874
Liabilities          
Financial Liabilities Fair Value Disclosure 880   880   925
Goodwill, Impairment Loss 0 $ 0 185 $ 0  
Carrying Amount [Member]          
Estimated Fair Value of Financial Instruments          
Long-term debt, including current maturities [1] 12,850   12,850   15,093
Fair Value [Member]          
Estimated Fair Value of Financial Instruments          
Long-term debt, including current maturities [1] 14,424   14,424   16,067
Fair Value, Inputs, Level 1 [Member]          
Assets          
Assets, Fair Value Disclosure 803   803   874
Liabilities          
Financial Liabilities Fair Value Disclosure 0   0   0
Fair Value, Inputs, Level 2 [Member]          
Assets          
Assets, Fair Value Disclosure 0   0   0
Liabilities          
Financial Liabilities Fair Value Disclosure 880   880   925
Fair Value, Inputs, Level 3 [Member]          
Assets          
Assets, Fair Value Disclosure 0   0   0
Liabilities          
Financial Liabilities Fair Value Disclosure 0   0   0
Fair Value, Recurring [Member]          
Assets          
Corporate equities 755   755   825
Investments, including money market funds (1) [2] 48   48   49
Fair Value, Recurring [Member] | Interest Rate Contract [Member]          
Liabilities          
Derivative liabilities 27   27   10
Fair Value, Recurring [Member] | Energy Related Derivative [Member]          
Liabilities          
Derivative liabilities 18   18   22
Fair Value, Recurring [Member] | IDS Derivative [Member]          
Liabilities          
Derivative liabilities 835   835   893
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Assets          
Corporate equities 755   755   825
Investments, including money market funds (1) [2] 48   48   49
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Interest Rate Contract [Member]          
Liabilities          
Derivative liability 0   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Energy Related Derivative [Member]          
Liabilities          
Derivative liability 0   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | IDS Derivative [Member]          
Liabilities          
Derivative liability 0   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Assets          
Corporate equities 0   0   0
Investments, including money market funds (1) [2] 0   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Interest Rate Contract [Member]          
Liabilities          
Derivative liability 27   27   10
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Energy Related Derivative [Member]          
Liabilities          
Derivative liability 18   18   22
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | IDS Derivative [Member]          
Liabilities          
Derivative liability 835   835   893
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Assets          
Corporate equities 0   0   0
Investments, including money market funds (1) [2] 0   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Interest Rate Contract [Member]          
Liabilities          
Derivative liability 0   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Energy Related Derivative [Member]          
Liabilities          
Derivative liability 0   0   0
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | IDS Derivative [Member]          
Liabilities          
Derivative liability 0   0   0
Houston Electric [Member]          
Assets          
Assets, Fair Value Disclosure 31   31   32
Houston Electric [Member] | Carrying Amount [Member]          
Estimated Fair Value of Financial Instruments          
Long-term debt, including current maturities [1] 5,115   5,115   4,950
Houston Electric [Member] | Fair Value [Member]          
Estimated Fair Value of Financial Instruments          
Long-term debt, including current maturities [1] 5,938   5,938   5,457
Houston Electric [Member] | Fair Value, Inputs, Level 1 [Member]          
Assets          
Assets, Fair Value Disclosure 31   31   32
Houston Electric [Member] | Fair Value, Inputs, Level 2 [Member]          
Assets          
Assets, Fair Value Disclosure 0   0   0
Houston Electric [Member] | Fair Value, Inputs, Level 3 [Member]          
Assets          
Assets, Fair Value Disclosure 0   0   0
Houston Electric [Member] | Fair Value, Recurring [Member]          
Assets          
Investments, including money market funds (1) [2] 31   31   32
Houston Electric [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Assets          
Investments, including money market funds (1) [2] 31   31   32
Houston Electric [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Assets          
Investments, including money market funds (1) [2] 0   0   0
Houston Electric [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Assets          
Investments, including money market funds (1) [2] 0   0   0
CERC Corp [Member]          
Assets          
Assets, Fair Value Disclosure 13   13   13
CERC Corp [Member] | Carrying Amount [Member]          
Estimated Fair Value of Financial Instruments          
Long-term debt, including current maturities 2,406   2,406   2,546
CERC Corp [Member] | Fair Value [Member]          
Estimated Fair Value of Financial Instruments          
Long-term debt, including current maturities 2,743   2,743   2,803
CERC Corp [Member] | Fair Value, Inputs, Level 1 [Member]          
Assets          
Assets, Fair Value Disclosure 13   13   13
CERC Corp [Member] | Fair Value, Inputs, Level 2 [Member]          
Assets          
Assets, Fair Value Disclosure 0   0   0
CERC Corp [Member] | Fair Value, Inputs, Level 3 [Member]          
Assets          
Assets, Fair Value Disclosure 0   0   0
CERC Corp [Member] | Fair Value, Recurring [Member]          
Assets          
Corporate equities 2   2   2
Investments, including money market funds (1) [2] 11   11   11
CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]          
Assets          
Corporate equities 2   2   2
Investments, including money market funds (1) [2] 11   11   11
CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]          
Assets          
Corporate equities 0   0   0
Investments, including money market funds (1) [2] 0   0   0
CERC Corp [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]          
Assets          
Corporate equities 0   0   0
Investments, including money market funds (1) [2] 0   0   $ 0
Infrastructure Services [Member]          
Liabilities          
Goodwill, Impairment Loss     82    
Fair Value Of Disposal Group 864   864    
Energy Services [Member]          
Liabilities          
Goodwill, Impairment Loss     62    
Loss on assets held for sale     70    
Fair Value Of Disposal Group 402   402    
Reduction of loss from reclassification to held for sale 39   39    
Energy Services [Member] | CERC Corp [Member]          
Liabilities          
Goodwill, Impairment Loss     62    
Loss on assets held for sale     70    
Enable Midstream Partners [Member]          
Liabilities          
Equity Method Investment, Other than Temporary Impairment 0 $ 0 1,541 $ 0  
Equity Method Investments, Fair Value Disclosure $ 848   848    
Indiana Electric Integrated [Member]          
Liabilities          
Goodwill, Impairment Loss     $ 185    
[1]
Includes Securitization Bonds debt.
[2]
Amounts are included in Prepaid expenses and other current assets in the Condensed Consolidated Balance Sheets.