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Fair Value Measurements (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Assets            
Assets, Fair Value Disclosure $ 882   $ 882     $ 874
Liabilities            
Financial Liabilities Fair Value Disclosure 949   949     925
Goodwill, Impairment Loss 0 $ 0 185 $ 0    
Carrying Amount [Member]            
Liabilities            
Long-term Debt, Fair Value [1] 13,268   13,268     15,093
Fair Value [Member]            
Liabilities            
Long-term Debt, Fair Value [1] 14,982   14,982     16,067
Fair Value, Inputs, Level 1 [Member]            
Assets            
Assets, Fair Value Disclosure 882   882     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 949   949     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 838   838     825
Investments, including money market funds (1) [2] 44   44     49
Fair Value, Recurring [Member] | Interest Rate Contract [Member]            
Liabilities            
Derivative liabilities 24   24     10
Fair Value, Recurring [Member] | Energy Related Derivative [Member]            
Liabilities            
Derivative liabilities 7   7     22
Fair Value, Recurring [Member] | IDS Derivative [Member]            
Liabilities            
Derivative liabilities 918   918     893
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]            
Assets            
Corporate equities 838   838     825
Investments, including money market funds (1) [2] 44   44     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 24   24     10
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Energy Related Derivative [Member]            
Liabilities            
Derivative liability 7   7     22
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | IDS Derivative [Member]            
Liabilities            
Derivative liability 918   918     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 27   27     32
Houston Electric [Member] | Carrying Amount [Member]            
Liabilities            
Long-term Debt, Fair Value [1] 5,089   5,089     4,950
Houston Electric [Member] | Fair Value [Member]            
Liabilities            
Long-term Debt, Fair Value [1] 5,968   5,968     5,457
Houston Electric [Member] | Fair Value, Inputs, Level 1 [Member]            
Assets            
Assets, Fair Value Disclosure 27   27     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] 27   27     32
Houston Electric [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]            
Assets            
Investments, including money market funds (1) [2] 27   27     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]            
Liabilities            
Long-term Debt, Fair Value 2,582   2,582     2,546
CERC Corp [Member] | Fair Value [Member]            
Liabilities            
Long-term Debt, Fair Value 2,973   2,973     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 0   31      
Fair Value Of Disposal Group 402   402      
Energy Services [Member] | CERC Corp [Member]            
Liabilities            
Goodwill, Impairment Loss     62      
Enable Midstream Partners [Member]            
Liabilities            
Equity Method Investment, Other than Temporary Impairment $ 0 $ 0 1,541 $ 0    
Equity Method Investments, Fair Value Disclosure         $ 848  
Indiana Electric Integrated [Member]            
Liabilities            
Goodwill, Impairment Loss [3]     $ 185      
[1] Includes Securitization Bonds debt.
[2] Amounts are included in Prepaid expenses and other current assets in the Condensed Consolidated Balance Sheets.
[3] CenterPoint Energy recognized a non-cash goodwill impairment charge as a result of the March 31, 2020 goodwill impairment test.