Supplemental Information (Tables)

9 Months Ended

Sep. 30, 2019

Supplemental Information [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, 2019, and December 31, 2018:

	September 30, 2019						December 31, 2018
	Ameren		Ameren Missouri		Ameren Illinois		Ameren		Ameren Missouri		Ameren Illinois
Cash and cash equivalents	$	20	$	—	$	—	$	16	$	—	$	—
Restricted cash included in “Other current assets”	14		4		6		13		4		6
Restricted cash included in “Other assets”	111		—		111		74		—		74
Restricted cash included in “Nuclear decommissioning trust fund”	10		10		—		4		4		—
Total cash, cash equivalents, and restricted cash	$	155	$	14	$	117	$	107	$	8	$	80

Lease Supplemental Information

The following table provides supplemental balance sheet information related to operating leases as of September 30, 2019:

	Ameren			Ameren Missouri
Other assets	$	38		$	36
Other current liabilities	8			7
Other deferred credits and liabilities	30			29
Weighted average remaining operating lease term	6 years			6 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 Ameren’s and Ameren Missouri’s remaining maturities of operating lease liabilities as of September 30, 2019:

	Ameren		Ameren Missouri
2019	$	2	$	2
2020	8		8
2021	8		7
2022	7		6
2023	6		6
Thereafter	11		10
Total lease payments	42		39
Less imputed interest	4		3
Total(a)	$	38	$	36

(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 September 30, 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 under Part II, Item 8, in the Form 10-K for further information on financing arrangements.

Schedule of Cash Flow, Supplemental Disclosures

Supplemental Cash Flow Information

The following table provides noncash financing and investing activity excluded from the statements of cash flows for the nine months ended September 30, 2019 and 2018:

	September 30, 2019								September 30, 2018
	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	273			138		128			240		94		133
Net realized and unrealized gain – nuclear decommissioning trust fund	100			100		—			33		33		—
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.

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, 2019:

	Ameren Missouri				Ameren Illinois			Ameren
Balance at December 31, 2018	$	646		(a)	$	4	(b)	$	650		(a)
Liabilities settled	(10		)		—			(10		)
Accretion	21			(c)	—			21			(c)
Change in estimates	33			(d)	—			33			(d)
Balance at September 30, 2019	$	690		(a)	$	4	(b)	$	694		(a)

(a) Balance included $23 million in “Other current liabilities” on the balance sheet as of both December 31, 2018, and September 30, 2019.

(b) Included in “Other deferred credits and liabilities” on the balance sheet.

(c) Accretion expense attributable to Ameren Missouri was recorded 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.

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, 2019:

	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, 2019(a)	682,811		$	56.58		155,253		$	57.38
Granted	297,728		67.42		(b)	128,883		65.49
Forfeitures	(33,195	)	64.34			(11,028	)	62.74
Vested and undistributed(c)	(180,823	)	62.24			(40,616	)	61.91
Vested and distributed	(176,923	)	44.13			(2,403	)	54.30
Nonvested at September 30, 2019(d)	589,598		$	63.62		230,089		$	60.90

(a) Does not include 619,783 performance share units and 26,557 restricted stock units that were vested and undistributed.

(b) Significant inputs to the Monte Carlo simulation model used to calculate the fair value of performance share units granted include Ameren’s closing common share price of $65.23 at December 31, 2018, Ameren’s common stock volatility of 17%, a volatility range for the peer group of 15% to 25%, and a three-year risk-free rate of 2.46%.

(c) Vested and undistributed units are awards that vest on a pro-rata basis due to attainment of retirement eligibility by certain employees, but have not yet been distributed. For vested and undistributed performance share units, the number of shares issued for retirement-eligible employees will vary depending on actual performance over the three year performance period.

(d)

Does not include 448,831 performance share units and 67,173 restricted stock units that were vested and undistributed.

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, 2019 and 2018:

	Three Months				Nine Months
	2019		2018		2019		2018
Ameren Missouri	$	49	$	52	$	118	$	133
Ameren Illinois	27		26		91		89
Ameren	$	76	$	78	$	209	$	222

Schedule of Earnings Per Share, Basic and Diluted

The following table presents Ameren’s basic and diluted earnings per share calculations and reconciles the weighted-average number of common shares outstanding to the diluted weighted-average number of common shares outstanding for the three and nine months ended September 30, 2019 and 2018:

	Three Months		Nine Months
	2019	2018	2019	2018
Weighted-average Common Shares Outstanding – Basic	245.9	244.1	245.5	243.6
Assumed settlement of performance share units and restricted stock units	1.4	2.2	1.4	1.9
Dilutive effect of forward sale agreement	0.2	—	0.1	—
Weighted-average Common Shares Outstanding – Diluted(a)	247.5	246.3	247.0	245.5

(a)

There were no potentially dilutive securities excluded from the earnings per diluted share calculations for the three and nine months ended September 30, 2019 and 2018.