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Related Party Transactions (Houston Electric and CERC) (Tables)
 6 Months Ended
Jun. 30, 2019
Related Party Transactions [Abstract]  
Schedule of Money Pool Investment and Borrowing [Table Text Block]
The table below summarizes money pool activity:
 
June 30, 2019

December 31, 2018
 
Houston Electric

CERC

Houston Electric

CERC
 
(in millions)
Money pool investments (borrowings) (1)
$
794

 
$
180

 
$
(1
)
 
$
114

Weighted average interest rate
2.67
%
 
2.67
%
 
2.42
%
 
2.42
%

(1)
Included in Accounts and notes receivable (payable)–affiliated companies on Houston Electric’s and CERC’s respective Condensed Consolidated Balance Sheets.
Schedule of Related Party Transactions [Table Text Block]
Amounts charged for these services were as follows and are included primarily in operation and maintenance expenses:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2019
 
2018
 
2019
 
2018
 
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
 
(in millions)
Corporate service charges
 
$
42

 
$
32

 
$
47

 
$
35

 
$
94

 
$
75

 
$
91

 
$
69

Net affiliate service charges (billings)
 
(2
)
 
2

 
(3
)
 
3

 
(4
)
 
4

 
(5
)
 
5


Infrastructure Services provides pipeline construction and repair services to CERC. Amounts charged for operation and maintenance expenses by Infrastructure Services to CERC were not significant from February 1, 2019 to June 30, 2019. Additionally, CERC, through CES, sells natural gas to Indiana Electric for use in electric generation activities. Amounts charged by CERC to Indiana Electric were not significant from February 1, 2019 to June 30, 2019.

The table below presents transactions among Houston Electric, CERC and their parent, Utility Holding.
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2019
 
2018
 
2019
 
2018
 
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
 
(in millions)
Cash dividends paid to parent
 
$
16

 
$
83

 
$
31

 
$
125

 
$
40

 
$
103

 
$
63

 
$
211

Cash contribution from parent
 
—

 
—

 
—

 
—

 
590

 
—

 
—

 
—


Houston Electric and CERC affiliate related net interest income (expense) were as follows:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2019
 
2018
 
2019
 
2018
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
Houston Electric
 
CERC
 
(in millions)
Interest income (expense) (1)
$
6

 
$
1

 
$
—

 
$
—

 
$
9

 
$
2

 
$
—

 
$
(2
)

(1)
Interest income is included in Other income (expense), net and interest expense is included in Interest and other finance charges on Houston Electric’s and CERC’s respective Condensed Statements of Consolidated Income.