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Unconsolidated Affiliate (CenterPoint Energy and CERC) (Details) - USD ($)
$ / shares in Units, $ in Millions
 3 Months Ended 6 Months Ended
Aug. 04, 2020
Apr. 01, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Dec. 31, 2018
Enable Units [Abstract]                    
Preferred units – unconsolidated affiliate     $ 363   $ 363     $ 363    
Percentage of sales that trigger right of first refusal         5.00%          
Enable Distributions [Abstract]                    
Proceeds from Equity Method Investment, Distribution         $ 109 $ 149        
Total distributions received from Enable     48 $ 84 134 167        
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss) [Abstract]                    
Operating revenues     1,575 1,658 3,742 3,887        
Depreciation and amortization     297 322 579 622        
Operating income     235 229 452 440        
Net income attributable to Enable common units     59 165 (1,169) 305        
Equity in earnings of unconsolidated affiliate, net     43 74 (1,432) 136        
Equity Method Investment, Summarized Financial Information, Assets and Liabilities [Abstract]                    
Current assets     2,501   2,501     3,937    
Current liabilities     4,309   4,309     3,978    
Enable partners’ equity     8,392 8,257 8,392 8,257   8,359    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity [Abstract]                    
Investment in unconsolidated affiliates     855   855     2,408    
Common Units [Member]                    
Equity Method Investment, Summarized Financial Information, Assets and Liabilities [Abstract]                    
Enable partners’ equity     5 5 5 5 $ 5 5 $ 5 $ 5
Series A Preferred Units [Member]                    
Equity Method Investment, Summarized Financial Information, Assets and Liabilities [Abstract]                    
Enable partners’ equity     2,441 1,740 2,441 1,740 1,740 1,740 1,740 1,740
CERC Corp [Member]                    
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss) [Abstract]                    
Operating revenues     483 526 1,494 1,738        
Depreciation and amortization     74 73 148 146        
Operating income     42 27 242 187        
Equity Method Investment, Summarized Financial Information, Assets and Liabilities [Abstract]                    
Current assets     541   541     1,489    
Current liabilities     1,170   1,170     1,111    
Enable partners’ equity     2,357 2,506 2,357 2,506   2,641    
CERC Corp [Member] | Common Units [Member]                    
Equity Method Investment, Summarized Financial Information, Assets and Liabilities [Abstract]                    
Enable partners’ equity     0 0 $ 0 0 $ 0 0 $ 0 $ 0
OGE [Member]                    
Enable Units [Abstract]                    
Percentage of sales that trigger right of first refusal         5.00%          
Proliance Holdings LLC [Member]                    
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss) [Abstract]                    
Equity in earnings of unconsolidated affiliate, net     0 0 $ 0 0        
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity [Abstract]                    
Investment in unconsolidated affiliates     $ 1   $ 1     2    
Enable Midstream Partners [Member]                    
Enable Partnership Interest [Abstract]                    
Ownership percentage of equity method investment [1]     53.70%   53.70%          
Limited partner ownership interest [1]         100.00%          
Enable Units [Abstract]                    
Equity Method Investments, Fair Value Disclosure     $ 848   $ 848          
Maximum incentive distribution right         50.00%          
Equity Method Investment, Summarized Financial Information, Gross Profit (Loss) [Abstract]                    
Operating revenues     515 735 $ 1,163 1,530        
Cost of sales, excluding depreciation and amortization     177 317 403 695        
Depreciation and amortization     105 110 209 215        
Goodwill and Intangible Asset Impairment     0   28 0        
Operating income     80 167 226 332        
Net income attributable to Enable common units     35 115 138 228        
CenterPoint Energy’s interest     19 62 74 123        
Basis difference amortization (1) [2]     24 12 36 24        
Dilution Loss, Equity Method Investment     0 0 (1) (11)        
Impairment of CenterPoint Energy’s equity method investment in Enable     0 0 (1,541) 0        
Equity in earnings of unconsolidated affiliate, net     43 74 (1,432) 136        
Equity Method Investment, Summarized Financial Information, Assets and Liabilities [Abstract]                    
Current assets     374   374     389    
Non-current assets     11,687   11,687     11,877    
Current liabilities     290   290     780    
Non-current liabilities     4,454   4,454     4,077    
Non-controlling interest     27   27     37    
Preferred equity     362   362     362    
Accumulated other comprehensive loss     (9)   (9)     (3)    
Enable partners’ equity     6,937   6,937     7,013    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity [Abstract]                    
CenterPoint Energy’s ownership interest in Enable partners’ equity     3,720   3,720     3,767    
CenterPoint Energy’s basis difference (1) [3]     (2,866)   (2,866)     (1,361)    
Investment in unconsolidated affiliates     854   854     2,406    
Enable Midstream Partners [Member] | Common Units [Member]                    
Enable Distributions [Abstract]                    
Proceeds from Equity Method Investment, Distribution     $ 39 $ 75 $ 116 $ 149        
Distribution per share of common units     $ 0.16525 $ 0.3180 $ 0.49575 [4] $ 0.6360        
Enable Midstream Partners [Member] | Series A Preferred Units [Member]                    
Enable Distributions [Abstract]                    
Distributions received from Enable cost method investment     $ 9 $ 9 $ 18 $ 18        
Distribution per share of Series A preferred units     $ 0.62500 $ 0.6250 $ 1.2500 $ 1.2500        
Enable Midstream Partners [Member] | OGE [Member]                    
Enable Partnership Interest [Abstract]                    
Limited partner ownership interest [1]         25.50%          
Enable Midstream Partners [Member] | Public unitholders [Member]                    
Enable Partnership Interest [Abstract]                    
Limited partner ownership interest [1]         20.80%          
Maximum [Member] | Enable Midstream Partners [Member]                    
Enable Units [Abstract]                    
Incentive distribution per unit         $ 0.330625          
Common Units [Member] | Enable Midstream Partners [Member]                    
Enable Units [Abstract]                    
Limited partner interest units held [5]     233,856,623   233,856,623          
Limited partner interest units held [5]     435,454,209   435,454,209          
Common Units [Member] | Enable Midstream Partners [Member] | OGE [Member]                    
Enable Units [Abstract]                    
Limited partner interest units held [5]     110,982,805   110,982,805          
Common Units [Member] | Enable Midstream Partners [Member] | Public unitholders [Member]                    
Enable Units [Abstract]                    
Limited partner interest units held [5]     90,614,781   90,614,781          
Series A Preferred Units [Member] | Enable Midstream Partners [Member]                    
Enable Units [Abstract]                    
Preferred Units Held [6]     14,520,000   14,520,000          
Natural Gas Expenses [Member] | Enable Midstream Partners [Member]                    
Transactions with Enable [Abstract]                    
Natural gas expenses, includes transportation and storage costs     $ 17 $ 18 $ 44 $ 45        
Accounts payable for natural gas purchases from Enable     6   6     9    
Natural Gas Expenses [Member] | Enable Midstream Partners [Member] | CERC Corp [Member]                    
Transactions with Enable [Abstract]                    
Natural gas expenses, includes transportation and storage costs     17 $ 18 44 $ 45        
Accounts payable for natural gas purchases from Enable     $ 6   $ 6     $ 9    
Enable GP, LLC [Member] | CenterPoint Energy [Member]                    
Enable Units [Abstract]                    
Management rights ownership percentage [7],[8]         50.00%          
Incentive Distribution Right, Percentage [8],[9]         40.00%          
Enable GP, LLC [Member] | OGE [Member]                    
Enable Units [Abstract]                    
Management rights ownership percentage [7]         50.00%          
Incentive Distribution Right, Percentage [9]         60.00%          
Common Units [Member] | Enable Midstream Partners [Member]                    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity [Abstract]                    
Percentage Reduction of Dividend or Distribution Amount   50.00%                
Common Units [Member] | Subsequent Event [Member] | Enable Midstream Partners [Member]                    
Enable Distributions [Abstract]                    
Proceeds from Equity Method Investment, Distribution $ 39                  
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity [Abstract]                    
Distribution Made to Limited Partner, Distributions Declared, Per Unit $ 0.16525                  
Previous Dividend or Distribution [Member] | Common Units [Member] | Enable Midstream Partners [Member]                    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity [Abstract]                    
Distribution Made to Limited Partner, Distributions Declared, Per Unit   $ 0.3305                
Revised Dividend or Distribution [Member] | Common Units [Member] | Enable Midstream Partners [Member]                    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity [Abstract]                    
Distribution Made to Limited Partner, Distributions Declared, Per Unit   $ 0.16525                
[1]
Excludes the Enable Series A Preferred Units owned by CenterPoint Energy.
[2]
Equity in earnings of unconsolidated affiliate includes CenterPoint Energy’s share of Enable earnings adjusted for the amortization of the basis difference of CenterPoint Energy’s original investment in Enable and its underlying equity in net assets of Enable. The basis difference is being amortized through the year 2048.
[3]
Includes the impairment of CenterPoint Energy’s equity method investment in Enable of $1,541 million recorded during the three months ended March 31, 2020. The basis difference is being amortized through the year 2048.
[4]
On April 1, 2020, Enable announced a 50% reduction in its quarterly distribution per common unit from $0.3305 to $0.16525.
[5]
Held indirectly through CNP Midstream by CenterPoint Energy.
[6]
The carrying amount of the Enable Series A Preferred Units, reflected as Preferred units - unconsolidated affiliate on CenterPoint Energy’s Condensed Consolidated Balance Sheets, was $363 million as of June 30, 2020 and $363 million as of December 31, 2019. No impairment charges or adjustment due to observable price changes were required or recorded during the current or prior reporting periods.

[7]
Enable is controlled jointly by CenterPoint Energy and OGE. Sale of CenterPoint Energy’s or OGE’s ownership interests in Enable GP to a third party is subject to mutual rights of first offer and first refusal, and CenterPoint Energy is not permitted to dispose of less than all of its interest in Enable GP.
[8]
Held indirectly through CNP Midstream.
[9]
If cash distributions to Enable’s unitholders exceed $0.330625 per common unit in any quarter, Enable GP will receive increasing percentages or incentive distributions rights, up to 50%, of the cash Enable distributes in excess of that amount. In certain circumstances Enable GP will have the right to reset the minimum quarterly distribution and the target distribution levels at which the incentive distributions receive increasing percentages to higher levels based on Enable’s cash distributions at the time of the exercise of this reset election. To date, no incentive distributions have been made.