Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 13		$ 30
Accounts receivable - trade (less allowance for doubtful accounts)	467		404
Unbilled revenue	203		304
Miscellaneous accounts and notes receivable	117		196
Materials and supplies	561		526
Current regulatory assets	199		156
Current accumulated deferred income taxes, net	301		106
Other current assets	66		85
Assets of discontinued operations (Note 12)	15		165
Total current assets	1,942		1,972
Property and Plant, Net	16,991		16,205
Investments and Other Assets:
Nuclear decommissioning trust fund	529		494
Goodwill	411		411
Intangible assets	20		22
Regulatory assets	1,259		1,240
Other assets	724		698
Total investments and other assets	2,943		2,865
TOTAL ASSETS	21,876		21,042
Current Liabilities:
Current maturities of long-term debt	119		534
Short-term Debt	753		368
Accounts and wages payable	466		806
Taxes accrued	161		55
Interest accrued	105		86
Current regulatory liabilities	132		216
Other current liabilities	350		351
Liabilities of discontinued operations (Note 12)	33		45
Total current liabilities	2,119		2,461
Long-term Debt, Net	5,825		5,504
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	3,845		3,250
Accumulated deferred investment tax credits	59		63
Regulatory liabilities	1,805		1,705
Asset retirement obligations	385		369
Pension and other postretirement benefits	400		466
Other deferred credits and liabilities	522		538
Total deferred credits and other liabilities	7,016		6,391
Commitments and Contingencies
Stockholders' Equity:
Common Stock	2		2
Other paid-in capital	5,612		5,632
Retained earnings	1,154		907
Accumulated other comprehensive income (loss)	6		3
Stockholder's equity	6,774		6,544
Noncontrolling Interest	142	[1]	142
Total equity	6,916		6,686
TOTAL LIABILITIES AND EQUITY	21,876		21,042
Union Electric Company
Current Assets:
Cash and cash equivalents	1		1
Accounts receivable - trade (less allowance for doubtful accounts)	261		191
Accounts receivable - affiliates	12		1
Unbilled revenue	134		168
Miscellaneous accounts and notes receivable	86		57
Materials and supplies	350		352
Current regulatory assets	137		118
Other current assets	40		71
Total current assets	1,021		959
Property and Plant, Net	10,660		10,452
Investments and Other Assets:
Nuclear decommissioning trust fund	529		494
Intangible assets	20		22
Regulatory assets	539		534
Other assets	410		443
Total investments and other assets	1,498		1,493
TOTAL ASSETS	13,179		12,904
Current Liabilities:
Current maturities of long-term debt	119		109
Borrowings from money pool			105
Short-term Debt	65
Accounts and wages payable	189		387
Accounts payable - affiliates	32		30
Taxes accrued	200		220
Interest accrued	66		57
Current regulatory liabilities	11		57
Other current liabilities	99		82
Total current liabilities	781		1,047
Long-term Debt, Net	3,885		3,648
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	2,656		2,524
Accumulated deferred investment tax credits	55		59
Regulatory liabilities	1,107		1,041
Asset retirement obligations	383		366
Pension and other postretirement benefits	147		189
Other deferred credits and liabilities	44		37
Total deferred credits and other liabilities	4,392		4,216
Commitments and Contingencies
Stockholders' Equity:
Common Stock	511		511
Other paid-in capital	1,560		1,560
Preferred stock not subject to mandatory redemption	80		80
Retained earnings	1,970		1,842
Stockholder's equity	4,121		3,993
TOTAL LIABILITIES AND EQUITY	13,179		12,904
Ameren Illinois Company
Current Assets:
Cash and cash equivalents	1		1
Accounts receivable - trade (less allowance for doubtful accounts)	192		201
Accounts receivable - affiliates	2
Unbilled revenue	69		135
Miscellaneous accounts and notes receivable	6		13
Materials and supplies	211		174
Current regulatory assets	62		38
Current accumulated deferred income taxes, net	125		45
Other current assets	17		26
Total current assets	685		633
Property and Plant, Net	6,030		5,589
Investments and Other Assets:
Goodwill	411		411
Regulatory assets	712		701
Other assets	145		120
Total investments and other assets	1,268		1,232
TOTAL ASSETS	7,983		7,454
Current Liabilities:
Borrowings from money pool	16		56
Short-term Debt	189
Accounts and wages payable	212		243
Accounts payable - affiliates	28		18
Taxes accrued	16		23
Customer deposits	71		79
Current environmental remediation	53		43
Current regulatory liabilities	121		159
Other current liabilities	148		150
Total current liabilities	854		771
Long-term Debt, Net	1,940		1,856
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	1,330		1,116
Accumulated deferred investment tax credits	3		4
Regulatory liabilities	698		664
Pension and other postretirement benefits	189		197
Environmental remediation	202		232
Other deferred credits and liabilities	165		166
Total deferred credits and other liabilities	2,587		2,379
Commitments and Contingencies
Stockholders' Equity:
Common Stock	0		0
Other paid-in capital	1,965		1,965
Preferred stock not subject to mandatory redemption	62		62
Retained earnings	566		410
Accumulated other comprehensive income (loss)	9		11
Stockholder's equity	2,602		2,448
TOTAL LIABILITIES AND EQUITY	$ 7,983		$ 7,454

[1] Included the 20% EEI ownership interest not owned by Ameren prior to the divestiture of New AER to IPH. Prior to the divestiture of New AER, the assets and liabilities of EEI were consolidated in Ameren’s balance sheet at a 100% ownership level and were included in “Assets of discontinued operations” and “Liabilities of discontinued operations,” respectively. The divestiture of New AER, which included EEI, was completed in the fourth quarter of 2013. See Note 12 - Divestiture Transactions and Discontinued Operations for additional information.