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Short-Term Debt And Liquidity (Tables)
 12 Months Ended
Dec. 31, 2019
Line of Credit Facility [Abstract]  
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)
 
$
900

$
500

Ameren Missouri
 
850

(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, 2019 and 2018:
 
 
Ameren (parent)
 
Ameren Missouri
 
Ameren Illinois
 
Ameren Consolidated
 
2019
 
 
 
 
 
 
 
 
 
Average daily commercial paper outstanding
 
$
421

 
$
122

 
$
157

 
$
700

 
Outstanding borrowings at period-end
 
153

 
234

 
53

 
440

 
Weighted-average interest rate
 
2.66
%
 
2.62
%
 
2.43
%
 
2.60
%
 
Peak outstanding commercial paper during period(a)
 
$
651

 
$
549

 
$
356

 
$
1,113

 
Peak interest rate
 
3.80
%
(b) 
2.97
%
 
5.00
%
(b) 
5.00
%
(b) 
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
%
 

(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.
(b)
In 2019, the peak interest rate was affected by temporary disruptions in the commercial paper market.