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 March 31, 2019, and December 31, 2018:



	March 31, 2019						December 31, 2018
	Ameren		Ameren Missouri		Ameren Illinois		Ameren		Ameren Missouri		Ameren Illinois
Cash and cash equivalents	$	8	$	—	$	—	$	16	$	—	$	—
Restricted cash included in “Other current assets”	16		5		6		13		4		6
Restricted cash included in “Other assets”	87		—		87		74		—		74
Restricted cash included in “Nuclear decommissioning trust fund”	7		7		—		4		4		—
Total cash, cash equivalents, and restricted cash	$	118	$	12	$	93	$	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 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 March 31, 2019, and December 31, 2018, “Other current liabilities” on Ameren’s and Ameren Illinois’ balance sheets included payables for purchased receivables of $38 million and $33 million, respectively.

For the three months ended March 31, 2019 and 2018, the Ameren Companies recorded immaterial bad debt expense.

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 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 three months ended March 31, 2019 and 2018.

The following table provides supplemental balance sheet information related to operating leases as of March 31, 2019:



	Ameren			Ameren Missouri
Other assets	$	36		$	34
Other current liabilities	7			6
Other deferred credits and liabilities	29			28
Weighted average remaining operating lease term	6 years			6 years
Weighted average discount rate^(a)	3.6		%	3.6		%


(a)	As most of our lease agreements do not provide an implicit rate, we use our incremental borrowing rate based on the information available at commencement date in determining the present value of lease payments. We use the implicit rate when readily determinable.

The following table presents Ameren’s and Ameren Missouri’s remaining maturities of operating lease liabilities as of March 31, 2019:



	Ameren		Ameren Missouri
2019	$	6	$	5
2020	7		7
2021	7		6
2022	6		5
2023	5		5
Thereafter	10		10
Total lease payments	41		38
Less imputed interest	5		4
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 to the amount as of March 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 under Part II, Item 8, in the Form 10-K for further information on financing arrangements.

Supplemental Cash Flow Information

The following table provides noncash investing activity excluded from the statements of cash flows for the three months ended March 31, 2019 and 2018:



	March 31, 2019						March 31, 2018
	Ameren		Ameren Missouri		Ameren Illinois		Ameren			Ameren Missouri			Ameren Illinois
Accrued capital expenditures	$	208	$	92	$	106	$	202		$	73		$	114
Net realized and unrealized gain (loss) – nuclear decommissioning trust fund	64		64		—		(11		)	(11		)	—

Asset Retirement Obligations

The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the three months ended March 31, 2019:



	Ameren Missouri				Ameren Illinois^(a)			Ameren
Balance at December 31, 2018	$	646		^(a)	$	4	^(b)	$	650		^(a)
Liabilities settled	(3		)		—			(3		)
Accretion	6			^(c)	—			6			^(c)
Balance at March 31, 2019	$	649		^(a)	$	4	^(b)	$	653		^(a)


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

Stock-based Compensation

The following table summarizes Ameren's nonvested performance share unit and restricted stock unit activity for the three months ended March 31, 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	288,956		67.42		^(b)	124,925		65.23
Forfeitures	(2,228	)	65.06			(833	)	63.16
Vested and undistributed^(c)	(65,458	)	62.04			(14,047	)	61.77
Vested and distributed	(176,923	)	44.13			—		—
Nonvested at March 31, 2019^(d)	727,158		$	63.40		265,298		$	60.64


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


(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 vested 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 333,466 vested and undistributed performance share units and 40,604 vested and undistributed restricted stock units.

For the three months ended March 31, 2019 and 2018, excess tax benefits associated with the settlement of stock-based compensation awards reduced income tax expense by $14 million and $6 million, respectively.

Deferred Compensation

As of March 31, 2019, and December 31, 2018, “Other deferred credits and liabilities” on Ameren’s balance sheet included deferred compensation obligations of $78 million and $80 million, respectively, recorded at the present value of future benefits to be paid.

Operating Revenues

As of March 31, 2019 and 2018, our remaining performance obligations for contracts with a term greater than one year were immaterial. The Ameren Companies elected not to disclose the aggregate amount of the transaction price allocated to the performance obligations that are unsatisfied as of the end of the reporting period for contracts with an initial expected term of one year or less.

See Note 14 – Segment Information for disaggregated revenue information.

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 three months ended March 31, 2019 and 2018:



	Three Months
	2019		2018
Ameren Missouri	$	31	$	34
Ameren Illinois	39		35		^(a)
Ameren	$	70	$	69	^(a)


(a)	Amounts have been adjusted from those previously reported to reflect additional excise taxes for the three months ended March 31, 2018.

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 period. Earnings per diluted share reflects the dilution that would occur if certain stock-based performance share units and restricted stock units were assumed to be settled. The number of performance share units and restricted stock units assumed settled was 1.5 million for both the three months ended March 31, 2019 and 2018. There were no potentially dilutive securities excluded from the earnings per diluted share calculations for the three months ended March 31, 2019 and 2018.