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Supplemental Information
 12 Months Ended
Dec. 31, 2019
Supplemental Information [Abstract]  
Supplemental Information SUPPLEMENTAL INFORMATION
Cash, Cash Equivalents, and 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 December 31, 2019 and 2018:
 
December 31, 2019
 
 
December 31, 2018
Ameren
Ameren
Missouri
Ameren
Illinois
 
 
Ameren
Ameren
Missouri
Ameren
Illinois
Cash and cash equivalents
$
16

$
9

$
—

 
 
$
16

$
—

$
—

Restricted cash included in “Other current assets”
14

4

5

 
 
13

4

6

Restricted cash included in “Other assets”
120

—

120

 
 
74

—

74

Restricted cash included in “Nuclear decommissioning trust fund”
26

26

—

 
 
4

4

—

Total cash, cash equivalents, and restricted cash
$
176

$
39

$
125

 
 
$
107

$
8

$
80


Restricted cash included in “Other current assets” primarily represents funds held by an irrevocable Voluntary Employee Beneficiary Association (VEBA) trust, which provides health care benefits for active employees. Restricted cash included in “Other assets” on Ameren’s and Ameren Illinois’ balance sheets primarily represents amounts collected under a cost recovery rider that are restricted for use in the procurement of renewable energy credits and amounts in a trust fund restricted for the use of funding certain asbestos-related claims.
Accounts Receivable
“Accounts receivable – trade” on Ameren’s and Ameren Illinois’ balance sheets include certain receivables purchased at a discount from alternative retail electric suppliers that elect to participate in the utility consolidated billing program. At December 31, 2019 and 2018, “Other current liabilities” on Ameren’s and Ameren Illinois’ balance sheets included payables for purchased receivables of $32 million and $33 million, respectively.
For the years ended December 31, 2019, 2018, and 2017, the Ameren Companies recorded immaterial bad debt expense.
Inventories
The following table presents the components of inventories for each of the Ameren Companies at December 31, 2019 and 2018:
 
December 31, 2019
 
 
December 31, 2018
 
Ameren
Missouri
Ameren
Illinois
Ameren
 
 
Ameren
Missouri
Ameren
Illinois
Ameren
Fuel(a)
$
126

$
—

$
126

 
 
$
123

$
—

$
123

Natural gas stored underground
6

57

63

 
 
7

64

71

Materials, supplies, and other
241

64

305

 
 
228

61

289

Total inventories
$
373

$
121

$
494

 
 
$
358

$
125

$
483

(a)
Consists of coal, oil, and propane.
Leases
In the first quarter of 2019, we adopted authoritative accounting guidance related to leases, which affected our financial position, but did not materially affect our results of operations or liquidity. The most significant impact for us was the recognition of right-of-use assets and lease liabilities for operating leases, while the accounting for our finance leases remained substantially unchanged. Ameren and Ameren Missouri recognized right-of-use assets and offsetting lease liabilities of $38 million and $36 million at January 1, 2019, respectively, primarily related to rail car leases. The effect of the adoption was immaterial at Ameren Illinois. No adjustment to comparative periods was made. We elected the available practical expedients upon adoption.
Ameren Missouri primarily leases rail cars under operating lease arrangements for the transportation of coal inventory to its energy centers. Although Ameren Missouri has options to renew a portion of these arrangements for up to five years on similar terms, the exercise of these options was not assumed in the recognition of right-of-use assets and lease obligations. For rail car leases, we account for the lease and non-lease components as a single lease component.
The operating lease expense and the cash paid for amounts included in the measurement of operating lease liabilities at Ameren and Ameren Missouri were immaterial for the years ended December 31, 2019, 2018, and 2017.
The following table provides supplemental balance sheet information related to operating leases as of December 31, 2019:
 
Ameren
 
Ameren Missouri
Other assets
$
36

 
$
34

Other current liabilities
7

 
7

Other deferred credits and liabilities
29

 
27

Weighted average remaining operating lease term
5 years

 
5 years

Weighted average discount rate(a)
3.5
%
 
3.4
%
(a)
As an implicit rate is not readily determinable under most of our lease agreements, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. We use an implicit rate when readily determinable.
The following table presents remaining maturities of operating lease liabilities as of December 31, 2019:
 
Ameren
 
Ameren Missouri
2020
$
8

 
$
8

2021
8

 
7

2022
7

 
6

2023
6

 
6

2024
5

 
5

Thereafter
5

 
5

Total lease payments
39

 
37

Less imputed interest
3

 
3

Total(a)
$
36

 
$
34

(a)
The amount of remaining maturities of operating lease liabilities under previous authoritative accounting guidance as of December 31, 2018, is materially consistent with the amount as of December 31, 2019. Maturities of certain financing arrangements, including the Peno Creek and Audrain energy centers' long-term agreements, are no longer required to be disclosed as lease-related maturities. See Note 5 – Long-Term Debt and Equity Financings, for further information on financing arrangements.
Asset Retirement Obligations
The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the years ended December 31, 2019 and 2018:
 
December 31, 2019
 
 
December 31, 2018
 
Ameren
Missouri
 
Ameren
Illinois
 
Ameren
 
 
 
Ameren
Missouri
 
Ameren
Illinois
 
Ameren
 
Beginning balance at January 1
$
646

(a) 
$
4

(b) 
$
650

(a) 
 
 
$
640

 
$
4

 
$
644

 
Liabilities settled
(20
)
 
—

 
(20
)
 
 
 
(7
)
 
—

 
(7
)
 
Accretion(c)
28

 
—

 
28

 
 
 
27

 
—

 
27

 
Change in estimates
33

(d) 
—

 
33

(d) 
 
 
(14
)
(e) 
—

 
(14
)
(e) 
Ending balance at December 31
$
687

(a) 
$
4

(b) 
$
691

(a) 
 
 
$
646

(a) 
$
4

(b) 
$
650

(a) 
(a)
Balance included $53 million and $23 million in “Other current liabilities” on the balance sheet as of December 31, 2019 and 2018, respectively.
(b)
Included in “Other deferred credits and liabilities” on the balance sheet.
(c)
Ameren Missouri’s accretion expense was deferred as a decrease to regulatory liabilities.
(d)
Ameren Missouri changed its fair value estimate primarily due to an increase in the cost estimate for closure of certain CCR storage facilities.
(e)
Ameren Missouri changed its fair value estimate primarily due to a reduction in the cost estimate for closure of certain CCR storage facilities.
Noncontrolling Interests
As of December 31, 2019 and 2018, Ameren’s noncontrolling interests included the preferred stock of Ameren Missouri and Ameren Illinois.
Deferred Compensation
As of December 31, 2019, and 2018, “Other current liabilities’ and “Other deferred credits and liabilities” on Ameren’s balance sheet included deferred compensation obligations of $86 million and $80 million, respectively, recorded at the present value of future benefits to be paid.
Excise Taxes
Ameren Missouri and Ameren Illinois collect from their customers excise taxes, including municipal and state excise taxes and gross receipts taxes, that are levied on the sale or distribution of natural gas and electricity. 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 years ended December 31, 2019, 2018, and 2017:
 
2019
 
2018
 
2017
 
Ameren Missouri
$
147

 
$
164

 
$
153

 
Ameren Illinois
117

 
118

 
112

 
Ameren
$
264

 
$
282

 
$
265

 

Allowance for Funds Used During Construction
The following table presents the average rate that was applied to eligible construction work in progress and the amounts of allowance for funds used during construction capitalized in 2019, 2018, and 2017:
 
2019
 
2018
 
2017
 
Average rate:
 
 
 
 
 
 
Ameren Missouri
6
%
 
7
%
 
7
%
 
Ameren Illinois
5
%
 
5
%
 
4
%
 
Ameren:
 
 
 
 
 
 
Allowance for equity funds used during construction
$
28

 
$
36

 
$
24

 
Allowance for borrowed funds used during construction
20

 
21

 
14

 
Total Ameren
$
48

 
$
57

 
$
38

 
Ameren Missouri:
 
 
 
 
 
 
Allowance for equity funds used during construction
$
19

 
$
27

 
$
21

 
Allowance for borrowed funds used during construction
12

 
14

 
10

 
Total Ameren Missouri
$
31

 
$
41

 
$
31

 
Ameren Illinois:
 
 
 
 
 
 
Allowance for equity funds used during construction
$
9

 
$
9

 
$
3

 
Allowance for borrowed funds used during construction
8

 
7

 
4

 
Total Ameren Illinois
$
17

 
$
16

 
$
7

 

Earnings per Share
Earnings per basic and diluted share are computed by dividing “Net Income Attributable to Ameren Common Shareholders” by the weighted-average number of basic and diluted common shares outstanding, respectively, during the applicable period. The weighted-average shares outstanding for earnings per diluted share includes the incremental effects resulting from performance share units, restricted stock units, and the forward sale agreement relating to common stock when the impact would be dilutive, as calculated using the treasury stock method. For information regarding performance share units and restricted stock units, see Note 11 – Stock-based Compensation. For information regarding the forward sale agreement, see Note 5 – Long-term Debt and Equity Financings.
The following table reconciles the weighted-average number of common shares outstanding to the diluted weighted-average number of common shares outstanding for the years ended December 31, 2019, 2018, and 2017:


2019
 
2018
 
2017
Weighted-average Common Shares Outstanding – Basic
245.6

 
243.8

 
242.6

Assumed settlement of performance share units and restricted stock units
1.4

 
2.0

 
1.6

Dilutive effect of forward sale agreement related to common stock
0.1

 
—

 
—

Weighted-average Common Shares Outstanding – Diluted(a)
247.1

 
245.8

 
244.2

(a)
There were no potentially dilutive securities excluded from the earnings per diluted share calculations for the years ended December 31, 2019, 2018, and 2017.
Supplemental Cash Flow Information
The following table provides noncash financing and investing activity excluded from the statements of cash flows for the years ended December 31, 2019 and 2018. There was no noncash financing or investing activity for the year ended December 31, 2017.
 
December 31, 2019
 
December 31, 2018
 
December 31, 2017
Ameren
Ameren
Missouri
Ameren
Illinois
 
Ameren
Ameren
Missouri
Ameren
Illinois
 
Ameren
Ameren
Missouri
Ameren
Illinois
Investing
 
 
 
 
 
 
 
 
 
 
 
Exchange of bond investments for the extinguishment of senior unsecured notes(a)
$
17

$
—

$
17

 
$
—

$
—

$
—

 
$
—

$
—

$
—

Accrued capital expenditures
333

140

163

 
272

121

138

 
361

159

175

Accrued nuclear fuel expenditures
19

19

—

 
20

20

—

 
10

10

—

Net realized and unrealized gain – nuclear decommissioning trust fund
143

143

—

 
(38
)
(38
)
—

 
3

3

—

Financing
 
 
 
 
 
 
 
 
 
 
 
Exchange of bond investments for the extinguishment of senior unsecured notes(a)
$
(17
)
$
—

$
(17
)
 
$
—

$
—

$
—

 
$
—

$
—

$
—

Issuance of common stock for stock-based compensation
54

—

—

 
35

—

—

 
—

—

—

(a)
See Note 4 – Long-term Debt and Equity Financings for additional information.