Schedule I - Condensed Financial Information Of Parent

12 Months Ended

Dec. 31, 2017

Condensed Financial Information of Parent Company Only Disclosure [Abstract]

Condensed Financial Information Of Parent

SCHEDULE I – CONDENSED FINANCIAL INFORMATION OF PARENT AMEREN CORPORATION CONDENSED STATEMENT OF INCOME AND COMPREHENSIVE INCOME For the Years Ended December 31, 2017, 2016, and 2015
(In millions)	2017			2016			2015
Operating revenues	$	—		$	—		$	—
Operating expenses	13			14			14
Operating loss	(13		)	(14		)	(14		)
Equity in earnings of subsidiaries	659			663			600
Interest income from affiliates	9			10			6
Total other expense, net	—			(5		)	(5		)
Interest charges	31			28			3
Income tax (benefit)	101			(27		)	5
Net Income Attributable to Ameren Common Shareholders – Continuing Operations	523			653			579
Net Income Attributable to Ameren Common Shareholders – Discontinued Operations	—			—			51
Net Income Attributable to Ameren Common Shareholders	$	523		$	653		$	630
Net Income Attributable to Ameren Common Shareholders – Continuing Operations	$	523		$	653		$	579
Other Comprehensive Income, Net of Taxes:
Pension and other postretirement benefit plan activity, net of income taxes (benefit) of $3, $(7), and $3, respectively	5			(20		)	6
Comprehensive Income from Continuing Operations Attributable to Ameren Common Shareholders	528			633			585
Comprehensive Income from Discontinued Operations Attributable to Ameren Common Shareholders	—			—			51
Comprehensive Income Attributable to Ameren Common Shareholders	$	528		$	633		$	636

SCHEDULE I – CONDENSED FINANCIAL INFORMATION OF PARENT AMEREN CORPORATION CONDENSED BALANCE SHEET
(In millions)	December 31, 2017			December 31, 2016
Assets:
Cash and cash equivalents	$	—		$	1
Advances to money pool	13			27
Accounts receivable – affiliates	46			31
Miscellaneous accounts and notes receivable	—			26
Other current assets	8			8
Total current assets	67			93
Investments in subsidiaries	7,944			7,498
Note receivable – ATXI	75			350
Accumulated deferred income taxes, net	222			419
Other assets	140			135
Total assets	$	8,448		$	8,495
Liabilities and Shareholders’ Equity:
Short-term debt	383			507
Borrowings from money pool	28			33
Accounts payable – affiliates	6			13
Other current liabilities	27			17
Total current liabilities	444			570
Long-term debt	696			694
Pension and other postretirement benefits	37			45
Other deferred credits and liabilities	87			83
Total liabilities	1,264			1,392
Commitments and Contingencies (Note 4)
Shareholders’ Equity:
Common stock, $.01 par value, 400.0 shares authorized – 242.6 shares outstanding	2			2
Other paid-in capital, principally premium on common stock	5,540			5,556
Retained earnings	1,660			1,568
Accumulated other comprehensive loss	(18		)	(23		)
Total shareholders’ equity	7,184			7,103
Total liabilities and shareholders’ equity	$	8,448		$	8,495

SCHEDULE I – CONDENSED FINANCIAL INFORMATION OF PARENT AMEREN CORPORATION CONDENSED STATEMENT OF CASH FLOWS For the Years Ended December 31, 2017, 2016, and 2015
(In millions)	2017			2016			2015
Net cash flows provided by operating activities	$	454		$	483		$	551
Cash flows from investing activities:
Money pool advances, net	14			(27		)	55
Notes receivable – ATXI, net	275			(60		)	(96		)
Investments in subsidiaries	(151		)	(123		)	(509		)
Other	6			2			(12		)
Net cash flows provided by (used in) investing activities	144			(208		)	(562		)
Cash flows from financing activities:
Dividends on common stock	(431		)	(416		)	(402		)
Short-term debt, net	(124		)	206			(284		)
Money pool borrowings, net	(5		)	19			14
Issuances of long-term debt	—			—			700
Debt issuance costs	—			—			(6		)
Share-based payments	(39		)	(83		)	(12		)
Net cash flows provided by (used in) financing activities	(599		)	(274		)	10
Net change in cash and cash equivalents	$	(1	)	$	1		$	(1	)
Cash and cash equivalents at beginning of year	1			—			1
Cash and cash equivalents at end of year	$	—		$	1		$	—
Cash dividends received from consolidated subsidiaries	$	362		$	465		$	575
Noncash investing activity – investments in subsidiaries	—			—			(38		)

AMEREN CORPORATION (parent company only)

NOTES TO CONDENSED FINANCIAL STATEMENTS

December 31, 2017

NOTE 1 – BASIS OF PRESENTATION

Ameren Corporation (parent company only) is a public utility holding company that conducts substantially all of its business operations through its subsidiaries. Ameren Corporation (parent company only) has accounted for its subsidiaries using the equity method. These financial statements are presented on a condensed basis.

See Note 1 – Summary of Significant Accounting Policies under Part II, Item 8, of this report for additional information. See Note 13 – Related-party Transactions under Part II, Item 8, of this report for information on the tax allocation agreement between Ameren Corporation (parent company only) and its subsidiaries.

NOTE 2 – SHORT-TERM DEBT AND LIQUIDITY

Ameren, Ameren Services, and other non-state-regulated Ameren subsidiaries have the ability, subject to Ameren parent company and applicable regulatory short-term borrowing authorizations, to access funding from the Credit Agreements and the commercial paper programs through a non-state-regulated subsidiary money pool agreement. All participants may borrow from or lend to the non-state-regulated money pool. The total amount available to pool participants from the non-state-regulated subsidiary money pool at any given time is reduced by the amount of borrowings made by participants, but is increased to the extent that the pool participants advance surplus funds to the non-state-regulated subsidiary money pool or remit funds from other external sources. The non-state-regulated subsidiary money pool was established to coordinate and to provide short-term cash and working capital for the participants. Participants receiving a loan under the non-state-regulated subsidiary money pool agreement must repay the principal amount of such loan, together with accrued interest. The rate of interest depends on the composition of internal and external funds in the non-state-regulated subsidiary money pool. Interest revenues and interest charges related to non-state-regulated money pool advances and borrowings were immaterial in 2015, 2016, and 2017.

Ameren Corporation (parent company only) had a total of $46 million in guarantees outstanding, primarily for ATXI, that were not recorded on its December 31, 2017 balance sheet. The ATXI guarantees were issued to local governments as assurance for potential remediation of damage caused by ATXI construction.

See Note 4 – Short-term Debt and Liquidity under Part II, Item 8, of this report for a description and details of short-term debt and liquidity needs of Ameren Corporation (parent company only).

NOTE 3 – LONG-TERM OBLIGATIONS

See Note 5 – Long-term Debt and Equity Financings under Part II, Item 8, of this report for additional information on Ameren Corporation’s (parent company only) long-term debt, indenture provisions, and restricted cash balance.

NOTE 4 – COMMITMENTS AND CONTINGENCIES

See Note 14 – Commitments and Contingencies under Part II, Item 8, of this report for a description of all material contingencies of Ameren Corporation (parent company only).

NOTE 5 – DIVESTITURE TRANSACTIONS AND DISCONTINUED OPERATIONS

See Note 1 – Summary of Significant Accounting Policies under Part II, Item 8, of this report for information regarding the divestiture transactions and discontinued operations.

NOTE 6 – INCOME TAXES

See Note 12 – Income Taxes under Part II, Item 8, of this report for information regarding the impacts of the TCJA on Ameren Corporation (parent company only).