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Other Income and Expenses
 6 Months Ended
Jun. 30, 2018
Other Nonoperating Income (Expense) [Abstract]  
OTHER INCOME AND EXPENSES
OTHER INCOME, NET
The following table presents the components of “Other Income, Net” in the Ameren Companies’ statements of income for the three and six months ended June 30, 2018 and 2017:
 
Three Months
 
Six Months
 
 
2018
 
2017
 
2018
 
2017
 
Ameren:(a)
 
 
 
 
 
 
 
 
Other Income, Net
 
 
 
 
 
 
 
 
Allowance for equity funds used during construction
$
9

 
$
4

 
$
14

 
$
10

 
Interest income on industrial development revenue bonds
7

 
6

 
13

 
13

 
Other interest income
2

 
3

 
4

 
5

 
Non-service cost components of net periodic benefit income
19

(b) 
10

 
35

(b) 
22

 
Other income
2

 
2

 
3

 
2

 
Donations
(6
)
 
(2
)
 
(11
)
 
(7
)
 
Other expense
(4
)
 
(3
)
 
(6
)
 
(7
)
 
Total Other Income, Net
$
29

 
$
20

 
$
52

 
$
38

 
Ameren Missouri:
 
 
 
 
 
 
 
 
Other Income, Net
 
 
 
 
 
 
 
 
Allowance for equity funds used during construction
$
7

 
$
4

 
$
11

 
$
9

 
Interest income on industrial development revenue bonds
7

 
6

 
13

 
13

 
Other interest income
1

 
1

 
1

 
1

 
Non-service cost components of net periodic benefit income
4

(b) 
6

 
9

(b) 
12

 
Other income
—

 
1

 
1

 
1

 
Donations
(2
)
 
(2
)
 
(3
)
 
(2
)
 
Other expense
(1
)
 
—

 
(3
)
 
(2
)
 
Total Other Income, Net
$
16

 
$
16

 
$
29

 
$
32

 
Ameren Illinois:
 
 
 
 
 
 
 
 
Other Income, Net
 
 
 
 
 
 
 
 
Allowance for equity funds used during construction
$
2

 
$
—

 
$
3

 
$
1

 
Interest income
1

 
2

 
3

 
4

 
Non-service cost components of net periodic benefit income
10

 
1

 
17

 
4

 
Other income
2

 
2

 
2

 
2

 
Donations
(1
)
 
(1
)
 
(5
)
 
(5
)
 
Other expense
(1
)
 
(1
)
 
(1
)
 
(3
)
 
Total Other Income, Net
$
13

 
$
3

 
$
19

 
$
3

 
(a)
Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.
(b)
For the three and six months ended June 30, 2018, the non-service cost components of net periodic benefit income were partially offset by a $4 million and $8 million deferral due to a regulatory tracking mechanism for the difference between the level of such costs incurred by Ameren Missouri under GAAP and the level of such costs included in rates.