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Summary Of Significant Accounting Policies (Tables)
 9 Months Ended
Sep. 30, 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 September 30, 2018 and 2017, and December 31, 2017 and 2016:
 
September 30, 2018
 
December 31, 2017
 
September 30, 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)
$
11

$
—

$
—

 
$
10

$
—

$
—

 
$
9

$
—

$
—

 
$
9

$
—

$
—

Restricted cash included in “Other current assets”
15

4

8

 
21

5

6

 
19

4

5

 
20

4

6

Restricted cash included in “Other assets”
63

—

63

 
35

—

35

 
27

—

27

 
22

—

22

Restricted cash included in “Nuclear decommissioning trust fund”
3

3

(b)

 
2

2

(b)

 
2

2

(b)

 
1

1

(b)

Total cash, cash equivalents, and restricted cash(c)
$
92

$
7

$
71

 
$
68

$
7

$
41

 
$
57

$
6

$
32

 
$
52

$
5

$
28

(a)
As presented on the balance sheets.
(b)
Not applicable.
(c)
As presented on the statements 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 nine months ended September 30, 2018 and 2017:
 
September 30, 2018
 
September 30, 2017
Ameren(a)
Ameren
Missouri
Ameren
Illinois
Ameren(a)
Ameren
Missouri
Ameren
Illinois
Accrued capital expenditures
$
240

$
94

$
133

 
$
202

$
70

$
100

Net realized and unrealized gain – nuclear decommissioning trust fund
33

33

(b)

 
53

53

(b)

(a)
Includes amounts for Ameren registrant and nonregistrant subsidiaries.
(b)
Not applicable.
Asset Retirement Obligation Disclosure
The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the nine months ended September 30, 2018:
 
Ameren
Missouri
 
Ameren
Illinois(a)
 
Ameren
 
Balance at December 31, 2017
$
640

(b) 
$
4

 
$
644

(b) 
Liabilities settled
(4
)
 
(c)

 
(4
)
 
Accretion(d)
20

 
(c)

 
20

 
Change in estimates(e)
(14
)
 
—

 
(14
)
 
Balance at September 30, 2018
$
642

(b) 
$
4

 
$
646

(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 September 30, 2018.
(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
The following table summarizes Ameren's nonvested performance share unit and restricted stock unit activity for the nine months ended September 30, 2018:
 
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
313,984

 
62.88

 
186,728

 
57.65

Forfeitures
(62,865
)
 
50.78

 
(4,964
)
 
58.99

Undistributed vested units(b)
(217,350
)
 
53.57

 
(19,742
)
 
59.01

Vested and distributed
(176,043
)
 
52.88

 
—

 
—

Nonvested at September 30, 2018(c)
753,215

 
$
56.31

 
162,022

 
$
57.44

(a)
Does not include 712,572 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 performance period.
(c)
Does not include 548,542 undistributed vested performance share units and 19,742 undistributed vested restricted stock units.
Schedule of Excise Taxes
The following table presents the excise taxes recorded on a gross basis in “Operating Revenues – Electric,” “Operating Revenues – Natural gas” and “Operating Expenses – Taxes other than income taxes” on the statements of income for the three and nine months ended September 30, 2018 and 2017:
 
Three Months
 
 
Nine Months
 
 
2018
 
2017
 
 
2018
 
2017
 
Ameren Missouri
$
52

 
$
51

 
 
$
133

 
$
122

 
Ameren Illinois
26

 
26

(a) 
 
89

 
82

(a) 
Ameren
$
78

 
$
77

(a) 
 
$
222

 
$
204

(a) 

(a)
Amounts have been adjusted from those previously reported to reflect additional excise taxes for the three and nine months ended September 30, 2017.