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Short-Term Debt and Liquidity (Tables)
 9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Schedule of Short-term Debt
The following table presents commercial paper outstanding, net of issuance discounts, as of September 30, 2019, and December 31, 2018:
 
September 30, 2019
 
December 31, 2018
Ameren (parent)
$
90

 
$
470

Ameren Missouri
144

 
55

Ameren Illinois
310

 
72

Ameren consolidated
$
544

 
$
597

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 nine months ended September 30, 2019 and 2018:
 
 
Ameren
(parent)
 
Ameren
Missouri
 
Ameren
Illinois
 
Ameren
Consolidated
 
2019
 
 
 
 
 
 
 
 
 
Average daily commercial paper outstanding at par value
 
$
532

 
$
141

 
$
147

 
$
821

 
Weighted-average interest rate
 
2.70
%
 
2.73
%
 
2.58
%
 
2.68
%
 
Peak commercial paper during period at par value(a)
 
$
651

 
$
549

 
$
310

 
$
1,113

 
Peak interest rate
 
3.80
%
 
2.97
%
 
5.00
%
(b) 
5.00
%
(b) 
2018
 
 
 
 
 
 
 
 
 
Average daily commercial paper outstanding at par value
 
$
431

 
$
81

 
$
117

 
$
629

 
Weighted-average interest rate
 
2.23
%
 
1.94
%
 
2.21
%
 
2.18
%
 
Peak commercial paper during period at par value(a)
 
$
543

 
$
481

 
$
442

 
$
1,295

 
Peak interest rate
 
2.45
%
 
2.42
%
 
2.55
%
 
2.55
%
 
(a)
The timing of peak outstanding commercial paper issuances varies by company. Therefore, the sum of individual company peak amounts may not equal the Ameren consolidated peak commercial paper issuances for the period.
(b)
In the third quarter of 2019, Ameren’s and Ameren Illinois’ peak interest rate was affected by temporary disruptions in the commercial paper market.