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Short-Term Debt And Liquidity Short-Term Debt and Liquidity (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Short-term Debt
The following table presents commercial paper outstanding, net of issuance discounts, as of June 30, 2018, and December 31, 2017:
  
2018
 
2017
Ameren (parent)
$
506

 
$
383

Ameren Missouri
—

 
39

Ameren Illinois
—

 
62

Ameren Consolidated
$
506

 
$
484

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 six months ended June 30, 2018 and 2017:
 
 
Ameren
(parent)
Ameren
Missouri
Ameren
Illinois
Ameren Consolidated
2018
 
 
 
 
 
 
Average daily commercial paper outstanding at par value
 
$
397

 
$
123

$
174

$
693

Weighted-average interest rate
 
2.14
%
 
1.94
%
2.20
%
2.12
%
Peak commercial paper during period at par value(a)
 
$
506

 
$
481

$
442

$
1,295

Peak interest rate
 
2.45
%
 
2.42
%
2.55
%
2.55
%
2017
 
 
 
 
 
 
Average daily commercial paper outstanding at par value
 
$
736

 
$
6

$
66

$
808

Weighted-average interest rate
 
1.19
%
 
1.10
%
1.14
%
1.19
%
Peak commercial paper during period at par value(a)
 
$
841

 
$
60

$
163

$
948

Peak interest rate
 
1.50
%
 
1.41
%
1.50
%
1.50
%

(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.