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Summary Of Significant Accounting Policies (Tables)
 3 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]  
Schedule of Cash and Cash Equivalents Including Restricted Cash
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets and the statements of cash flows as of March 31, 2018 and 2017, and December 31, 2017 and 2016:
 
March 31, 2018
 
December 31, 2017
 
March 31, 2017
 
December 31, 2016
Ameren
Ameren
Missouri
Ameren
Illinois
Ameren
Ameren
Missouri
Ameren
Illinois
Ameren
Ameren
Missouri
Ameren
Illinois
Ameren
Ameren
Missouri
Ameren
Illinois
Cash and cash equivalents(a)
$
30

$
3

$
3

 
$
10

$
—

$
—

 
$
8

$
—

$
—

 
$
9

$
—

$
—

Restricted cash included in “Other current assets”
12

4

5

 
21

5

6

 
19

4

5

 
20

4

6

Restricted cash included in “Other assets”
44

—

44

 
35

—

35

 
23

—

23

 
22

—

22

Restricted cash included in “Nuclear decommissioning trust fund”
3

3

(b)

 
2

2

(b)

 
1

1

(b)

 
1

1

(b)

Total cash, cash equivalents, and restricted cash(c)
$
89

$
10

$
52

 
$
68

$
7

$
41

 
$
51

$
5

$
28

 
$
52

$
5

$
28

(a)
As presented on the balance sheet.
(b)
Not applicable.
(c)
As presented on the statement of cash flows.
Schedule of Cash Flow, Supplemental Disclosures
The following table provides noncash investing activity excluded from the statements of cash flows for the three months ended March 31, 2018 and 2017:
 
March 31, 2018
 
March 31, 2017
Ameren(a)
Ameren
Missouri
Ameren
Illinois
Ameren(a)
Ameren
Missouri
Ameren
Illinois
Accrued capital expenditures
$
202

$
73

$
114

 
$
164

$
50

$
74

Accrued nuclear fuel expenditures
(b)

(b)

(c)

 
13

13

(c)

Net realized gain – nuclear decommissioning trust fund
(b)

(b)

(c)

 
4

4

(c)

Net unrealized gain (loss) – nuclear decommissioning trust fund
(11
)
(11
)
(c)

 
19

19

(c)

(a)
Includes amounts for Ameren registrant and nonregistrant subsidiaries.
(b)
Less than $1 million.
(c)
Not applicable.
Asset Retirement Obligation Disclosure
The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the three months ended March 31, 2018:
 
Ameren
Missouri
 
Ameren
Illinois(a)
 
Ameren
 
Balance at December 31, 2017
$
640

(b) 
$
4

 
$
644

(b) 
Liabilities settled
(c)

 
(c)

 
(c)

 
Accretion(d)
7

 
(c)

 
7

 
Change in estimates(e)
(9
)
 
—

 
(9
)
 
Balance at March 31, 2018
$
638

(b) 
$
4

 
$
642

(b) 
(a)
Included in “Other deferred credits and liabilities” on the balance sheet.
(b)
Balance included $6 million in “Other current liabilities” on the balance sheet as of both December 31, 2017, and March 31, 2018, respectively.
(c)
Less than $1 million.
(d)
Accretion expense attributable to Ameren Missouri was recorded as a decrease to regulatory liabilities.
(e)
Ameren Missouri changed its fair value estimate primarily due to a reduction in the cost estimate for closure of certain CCR storage facilities
Summary Of Nonvested Shares Related To Long-Term Incentive Plan
A summary of nonvested performance share units and restricted stock units at March 31, 2018, and changes during the three months ended March 31, 2018, under the 2014 Incentive Plan are presented below:
 
Performance Share Units
 
Restricted Stock Units
 
Share Units
 
Weighted-average Fair Value per Share Unit
 
Stock Units
 
Weighted-average Fair Value per Stock Unit
Nonvested at January 1, 2018(a)
895,489

 
$
52.28

 
—

 
$
—

Granted
298,774

 
62.88

 
181,145

 
57.62

Forfeitures
(37,337
)
 
46.08

 
(643
)
 
58.99

Undistributed vested units(b)
(72,392
)
 
53.50

 
(6,458
)
 
58.99

Earned and vested
(176,043
)
 
52.88

 
—

 
—

Nonvested at March 31, 2018(c)
908,491

 
$
55.81

 
174,044

 
$
57.56

(a)
Excludes 712,572 of undistributed vested performance share units.
(b)
Undistributed vested units are awards that vested due to attainment of retirement eligibility by certain employees, but have not yet been distributed. For undistributed vested performance share units, the number of shares issued for retirement-eligible employees will vary depending on actual performance over the three-year measurement period.
(c)
Excludes 403,584 undistributed vested performance share units and 6,458 undistributed vested restricted stock units.
Schedule of Excise Taxes
The following table presents the excise taxes recorded in “Operating Revenues – Electric,” “Operating Revenues – Natural gas” and “Operating Expenses – Taxes other than income taxes” for the three months ended March 31, 2018 and 2017:
 
 
Three Months
 
 
2018
 
2017
Ameren Missouri
 
$
34

 
$
31

Ameren Illinois
 
22

 
19

Ameren
 
$
56

 
$
50