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Leases (Tables)
 12 Months Ended
Dec. 31, 2020
Leases [Abstract]  
Lease, Cost [Table Text Block]
The components of lease cost, included in Operation and maintenance expense on the Registrants’ respective Statements of Consolidated Income, are as follows:
Year Ended December 31, 2020Year Ended December 31, 2019
CenterPoint EnergyHouston
Electric		CERCCenterPoint EnergyHouston
Electric		CERC
(in millions)
Operating lease cost$9 $— $5 $7 $— $4 
Short-term lease cost14 12 — 25 23 — 
Total lease cost$23 $12 $5 $32 $23 $4 
Operating Lease, Lease Income [Table Text Block]
The components of lease income were as follows:
Year Ended December 31, 2020Year Ended December 31, 2019
CenterPoint EnergyHouston
Electric		CERCCenterPoint EnergyHouston
Electric		CERC
(in millions)
Operating lease income$5 $— $2 $4 $2 $1 
Variable lease income1 — — 2 — — 
Total lease income$6 $— $2 $6 $2 $1 
Supplemental Balance Sheet Information Related To Leases [Table Text Block]
Supplemental balance sheet information related to leases was as follows:
December 31, 2020December 31, 2019
CenterPoint EnergyHouston
Electric		CERCCenterPoint EnergyHouston
Electric		CERC
(in millions, except lease term and discount rate)
Assets:
Operating ROU assets (1)
$31 $1 $19 $31 $1 $18 
Total leased assets$31 $1 $19 $31 $1 $18 
Liabilities:
Current operating lease liability (2)
$6 $— $3 $7 $— $3 
Non-current operating lease liability (3)
26 1 18 24 1 15 
Total leased liabilities$32 $1 $21 $31 $1 $18 
Weighted-average remaining lease term (in years) - operating leases6.04.07.56.55.27.1
Weighted-average discount rate - operating leases3.14 %2.59 %3.36 %3.57 %3.52 %3.61 %

(1)Reported within Other assets in the Registrants’ respective Consolidated Balance Sheets.

(2)Reported within Current other liabilities in the Registrants’ respective Consolidated Balance Sheets.

(3)Reported within Other liabilities in the Registrants’ respective Consolidated Balance Sheets.
Lessee, Operating Lease, Liability, Maturity [Table Text Block]
As of December 31, 2020, maturities of operating lease liabilities were as follows:
CenterPoint
Energy		Houston
Electric		CERC
(in millions)
2021$8 $1 $4 
20226 — 4 
20236 — 4 
20244 — 3 
20253 — 2 
2026 and beyond10 — 7 
Total lease payments37 1 24 
Less: Interest5 — 3 
Present value of lease liabilities$32 $1 $21 
Lessor, Operating Lease, Payments to be Received, Maturity [Table Text Block]
As of December 31, 2020, maturities of undiscounted operating lease payments to be received are as follows:
CenterPoint
Energy		Houston
Electric		CERC
(in millions)
2021$4 $— $1 
20222 — — 
20232 — — 
20242 — — 
20252 — — 
2026 and beyond8 — — 
Total lease payments to be received$20 $— $1 
Other Information Related To Leases [Table Text Block]
Other information related to leases is as follows. See Note 19 for information on ROU assets obtained in exchange for operating lease liabilities:
Year Ended December 31, 2020
CenterPoint
Energy		Houston
Electric		CERC
(in millions)
Operating cash flows from operating leases included in the measurement of lease liabilities$8 $1 $4