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Supplemental Information (Tables)

12 Months Ended

Dec. 31, 2019

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 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

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheet as of December 31, 2019 and 2018:



	2019		2018
Cash and cash equivalents	$	—	$	—
Restricted cash included in “Other current assets”	3		1
Total cash, cash equivalents, and restricted cash	$	3	$	1

Schedule of 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.

Lease Supplemental Information

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.

Schedule of Maturity of Operating Lease Liabilities

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 Obligation Disclosure

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.

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 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

Schedule of Rates and Amounts For 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

Schedule of Earnings Per Share, Basic and Diluted

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.

Schedule of Cash Flow, Supplemental Disclosures

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.