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Related Party Transactions (Houston Electric and CERC) (Tables)
 9 Months Ended
Sep. 30, 2018
Related Party Transactions [Abstract]  
Schedule of Money Pool Investment and Borrowing [Table Text Block]
The table below summarizes money pool activity:
 
September 30, 2018

December 31, 2017
 
Houston Electric

CERC

Houston Electric

CERC
 
(in millions)
Money pool investments (borrowings) (1)
$
(75
)
 
$
—

 
$
(60
)
 
$
(570
)
Weighted average interest rate
2.45
%
 
2.45
%
 
1.90
%
 
1.90
%

(1)
Included in Accounts and notes receivable (payable)–affiliated companies in the Condensed Consolidated Balance Sheets.
Schedule of Related Party Transactions [Table Text Block]
Houston Electric and CERC affiliate related net interest income (expense) were as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2018
 
2017
 
2018
 
2017
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
 
 
 
 
(in millions)
 
 
 
 
Interest income (expense) (1)
$
1

 
$
(2
)
 
$
1

 
$
—

 
$
1

 
$
(4
)
 
$
3

 
$
—


(1)
Interest income is included in Other, net and interest expense is included in Interest and other finance charges on the Condensed Statements of Consolidated Income.

Amounts charged for these services were as follows and are included primarily in operation and maintenance expenses:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
 
(in millions)
Corporate service charges
 
$
47

 
$
36

 
$
41

 
$
30

 
$
138

 
$
105

 
$
127

 
$
93

Net affiliate service charges (billings)
 
(3
)
 
3

 
(1
)
 
1

 
(8
)
 
8

 
(6
)
 
6


The table below presents transactions among Houston Electric, CERC and their parent, Utility Holding.
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
 
2018
 
2017
 
2018
 
2017
 
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
 
(in millions)
Cash dividends paid to parent
 
$
60

 
$
75

 
$
45

 
$
89

 
$
123

 
$
286

 
$
87

 
$
337

Cash contribution from parent
 
—

 
600

 
—

 
—

 
—

 
600

 
—

 
38

Capital distribution to parent associated with the Internal Spin
 
—

 
1,460

 
—

 
—

 
—

 
1,460

 
—

 
—