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Unconsolidated Affiliate (CenterPoint Energy and CERC) - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Feb. 16, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Schedule of Equity Method Investments [Line Items]          
Cash paid for merger $ 5        
Gain on Enable Merger   $ 681 $ 0 $ 0  
OGE          
Schedule of Equity Method Investments [Line Items]          
Payment upon termination of partnership $ 30        
Enable Midstream Partners          
Schedule of Equity Method Investments [Line Items]          
Limited partner ownership interest 79.20%        
Gain on Enable Merger   680 0 0  
Equity method investment, fair value         $ 848
Equity method investment, impairment   $ 0 $ 1,541 $ 0  
Enable Midstream Partners | Common Units          
Schedule of Equity Method Investments [Line Items]          
Gain on Enable Merger $ 680        
Enable Midstream Partners | Series A Preferred Units [Member]          
Schedule of Equity Method Investments [Line Items]          
Gain on Enable Merger $ 1