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Short-Term Debt And Liquidity (Tables)
 12 Months Ended
Dec. 31, 2018
Short-term Debt [Line Items]  
Schedule Of Maximum Aggregate Amount Available On Credit Agreements
The following table presents the maximum aggregate amount available to each borrower under each facility:
 
 
Missouri
Credit Agreement
Illinois
Credit Agreement
Ameren (parent)
 
$
700

$
500

Ameren Missouri
 
800

(a)

Ameren Illinois
 
(a)

800

(a)
Not applicable.
Schedule of Commercial Paper
The following table summarizes the borrowing activity and relevant interest rates under Ameren (parent)’s, Ameren Missouri’s, and Ameren Illinois’ commercial paper programs for the years ended December 31, 2018 and 2017:
 
 
Ameren (parent)
Ameren Missouri
Ameren Illinois
Ameren Consolidated
2018
 
 
 
 
 
 
Average daily commercial paper outstanding
 
$
410

 
$
61

$
108

$
579

Outstanding borrowings at period-end
 
470

 
55

72

597

Weighted-average interest rate
 
2.31
%
 
1.94
%
2.26
%
2.26
%
Peak outstanding commercial paper during period(a)
 
$
543

 
$
481

$
442

$
1,295

Peak interest rate
 
3.10
%
 
2.80
%
2.85
%
3.10
%
2017
 
 
 
 
 
 
Average daily commercial paper outstanding
 
$
573

 
$
5

$
90

$
668

Outstanding borrowings at period-end
 
383

 
39

62

484

Weighted-average interest rate
 
1.30
%
 
1.24
%
1.35
%
1.31
%
Peak outstanding commercial paper during period(a)
 
$
841

 
$
64

$
469

$
948

Peak interest rate
 
1.90
%
 
1.78
%
2.00
%
2.00
%
(a)
The timing of peak outstanding commercial paper issuances varies by company. Therefore, the sum of the peak amounts presented by the companies may not equal the Ameren consolidated peak amount for the period.