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Other Income and Expenses (Tables)
 3 Months Ended
Mar. 31, 2019
Other Nonoperating Income (Expense) [Abstract]  
Other Income And Expenses
The following table presents the components of “Other Income, Net” in the Ameren Companies’ statements of income for the three months ended March 31, 2019 and 2018:
 
Three Months
 
 
2019
 
2018
 
Ameren:
 
 
 
 
 
Three Months
 
 
2019
 
2018
 
Allowance for equity funds used during construction
$
6

 
$
5

 
Interest income on industrial development revenue bonds
6

 
6

 
Other interest income
2

 
2

 
Non-service cost components of net periodic benefit income(a)
22

 
16

 
Miscellaneous income
2

 
1

 
Donations
(6
)
 
(5
)
 
Miscellaneous expense
(3
)
 
(2
)
 
Total Other Income, Net
$
29

 
$
23

 
Ameren Missouri:
 
 
 
 
Allowance for equity funds used during construction
$
4

 
$
4

 
Interest income on industrial development revenue bonds
6

 
6

 
Non-service cost components of net periodic benefit income(a)
4

 
5

 
Miscellaneous income
1

 
1

 
Donations
(2
)
 
(1
)
 
Miscellaneous expense
(1
)
 
(2
)
 
Total Other Income, Net
$
12

 
$
13

 
Ameren Illinois:
 
 
 
 
Allowance for equity funds used during construction
$
2

 
$
1

 
Interest income
2

 
2

 
Non-service cost components of net periodic benefit income
12

 
7

 
Miscellaneous income
1

 
—

 
Donations
(4
)
 
(4
)
 
Miscellaneous expense
(2
)
 
—

 
Total Other Income, Net
$
11

 
$
6

 
(a)
For the three months ended March 31, 2019 and 2018, the non-service cost components of net periodic benefit income were partially offset by a $7 million and $4 million deferral, respectively, 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.