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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
The Registrants’ net periodic cost, before considering amounts subject to overhead allocations for capital expenditure projects or for amounts subject to deferral for regulatory purposes, includes the following components relating to pension and postretirement benefits:

Pension Benefits (CenterPoint Energy)
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2019
 
2018
 
2019
 
2018
 
(in millions)
Service cost (1)
$
10

 
$
10

 
$
30

 
$
28

Interest cost (2)
25

 
20

 
73

 
59

Expected return on plan assets (2)
(27
)
 
(27
)
 
(79
)
 
(80
)
Amortization of prior service cost (2)
2

 
3

 
6

 
7

Amortization of net loss (2)
13

 
10

 
39

 
32

Settlement cost (3) (2)
1

 
—

 
2

 
—

Curtailment gain (4) (2)
—

 
—

 
(1
)
 
—

Net periodic cost
$
24

 
$
16

 
$
70

 
$
46


(1)
Amounts presented in the table above are included in Operation and maintenance expense in each of the Registrants’ respective Condensed Statements of Consolidated Income, net of amounts capitalized and regulatory deferrals.

(2)
Amounts presented in the table above are included in Other income (expense), net in each of the Registrants’ respective Condensed Statements of Consolidated Income, net of regulatory deferrals.

(3)
A one-time, non-cash settlement cost is required when the total lump sum distributions or other settlements of plan benefit obligations during a plan year exceed the service cost and interest cost components of the net periodic cost for that year. CenterPoint Energy recognized a non-cash settlement cost of $1 million in June and September 2019, respectively, due to lump sum settlement payments.

(4)
A curtailment gain or loss is required when the expected future services of a significant number of employees are reduced or eliminated for the accrual of benefits. In February 2019, CenterPoint Energy recognized a pension curtailment gain of $1 million related to Vectren employees whose employment was terminated after the Merger closed.
Postretirement Benefits
 
Three Months Ended September 30,
 
2019
 
2018
 
CenterPoint Energy
 
Houston Electric
 
CERC
 
CenterPoint Energy
 
Houston Electric
 
CERC
 
(in millions)
Service cost (1)
$
2

 
$
—

 
$
—

 
$
—

 
$
—

 
$
1

Interest cost (2)
4

 
1

 
2

 
3

 
2

 
1

Expected return on plan assets (2)
(3
)
 
(1
)
 
—

 
(1
)
 
(1
)
 
—

Amortization of prior service cost (credit) (2)
(1
)
 
(1
)
 
—

 
(1
)
 
(1
)
 
—

Net periodic cost (income)
$
2

 
$
(1
)
 
$
2

 
$
1

 
$
—

 
$
2

 
 
 
 
 
 
 
 
 
 
 
 
 
Nine Months Ended September 30,
 
2019
 
2018
 
CenterPoint Energy
 
Houston Electric
 
CERC
 
CenterPoint Energy
 
Houston Electric
 
CERC
 
(in millions)
Service cost (1)
$
3

 
$
—

 
$
1

 
$
1

 
$
—

 
$
1

Interest cost (2)
12

 
5

 
4

 
10

 
6

 
3

Expected return on plan assets (2)
(6
)
 
(3
)
 
(1
)
 
(4
)
 
(3
)
 
(1
)
Amortization of prior service cost (credit) (2)
(3
)
 
(4
)
 
—

 
(3
)
 
(4
)
 
1

Net periodic cost (income)
$
6

 
$
(2
)
 
$
4

 
$
4

 
$
(1
)
 
$
4



(1)
Amounts presented in the tables above are included in Operation and maintenance expense in each of the Registrants’ respective Condensed Statements of Consolidated Income, net of amounts capitalized and regulatory deferrals.

(2)
Amounts presented in the tables above are included in Other income (expense), net in each of the Registrants’ respective Condensed Statements of Consolidated Income, net of regulatory deferrals.
Benefit Plan Contributions [Table Text Block]
The table below reflects the expected contributions to be made to the pension and postretirement benefit plans during 2019:
 
CenterPoint Energy
 
Houston Electric
 
CERC
 
(in millions)
Expected minimum contribution to pension plans during 2019
$
94

 
$
—

 
$
—

Expected contribution to postretirement benefit plans in 2019
20

 
10

 
4


The table below reflects the contributions made to the pension and postretirement benefit plans during 2019:
 
Three Months Ended September 30, 2019
 
Nine Months Ended September 30, 2019
 
CenterPoint Energy
 
Houston Electric
 
CERC
 
CenterPoint Energy
 
Houston Electric
 
CERC
 
(in millions)
Pension plans
$
65

 
$
—

 
$
—

 
$
94

 
$
—

 
$
—

Postretirement benefit plans
4

 
3

 
1

 
12

 
8

 
3