Consolidated Balance Sheet (USD $) In Millions, unless otherwise specified	Jun. 30, 2014		Dec. 31, 2013
Current Assets:
Cash and cash equivalents	$ 46		$ 30
Accounts receivable - trade (less allowance for doubtful accounts)	454		404
Unbilled revenue	299		304
Miscellaneous accounts and notes receivable	213		196
Materials and supplies	491		526
Current regulatory assets	202		156
Current accumulated deferred income taxes, net	177		106
Other current assets	68		85
Assets of discontinued operations (Note 12)	15		165
Total current assets	1,965		1,972
Property and Plant, Net	16,726		16,205
Investments and Other Assets:
Nuclear decommissioning trust fund	523		494
Goodwill	411		411
Intangible assets	19		22
Regulatory assets	1,213		1,240
Other assets	731		698
Total investments and other assets	2,897		2,865
TOTAL ASSETS	21,588		21,042
Current Liabilities:
Current maturities of long-term debt	119		534
Short-term Debt	793		368
Accounts and wages payable	575		806
Taxes accrued	132		55
Interest accrued	92		86
Current regulatory liabilities	218		216
Other current liabilities	350		351
Liabilities of discontinued operations (Note 12)	33		45
Total current liabilities	2,312		2,461
Long-term Debt, Net	5,825		5,504
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	3,526		3,250
Accumulated deferred investment tax credits	60		63
Regulatory liabilities	1,784		1,705
Asset retirement obligations	380		369
Pension and other postretirement benefits	463		466
Other deferred credits and liabilities	524		538
Total deferred credits and other liabilities	6,737		6,391
Commitments and Contingencies
Stockholders' Equity:
Common Stock	2		2
Other paid-in capital	5,607		5,632
Retained earnings	957		907
Accumulated other comprehensive income (loss)	6		3
Stockholder's equity	6,572		6,544
Noncontrolling Interest	142	[1]	142
Total equity	6,714		6,686
TOTAL LIABILITIES AND EQUITY	21,588		21,042
Union Electric Company
Current Assets:
Cash and cash equivalents	28		1
Accounts receivable - trade (less allowance for doubtful accounts)	217		191
Accounts receivable - affiliates	2		1
Unbilled revenue	214		168
Miscellaneous accounts and notes receivable	81		57
Materials and supplies	352		352
Current regulatory assets	141		118
Other current assets	82		71
Total current assets	1,117		959
Property and Plant, Net	10,599		10,452
Investments and Other Assets:
Nuclear decommissioning trust fund	523		494
Intangible assets	19		22
Regulatory assets	529		534
Other assets	416		443
Total investments and other assets	1,487		1,493
TOTAL ASSETS	13,203		12,904
Current Liabilities:
Current maturities of long-term debt	119		109
Borrowings from money pool	61		105
Short-term Debt	185
Accounts and wages payable	195		387
Accounts payable - affiliates	16		30
Taxes accrued	157		220
Interest accrued	73		57
Current regulatory liabilities	39		57
Other current liabilities	101		82
Total current liabilities	946		1,047
Long-term Debt, Net	3,885		3,648
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	2,613		2,524
Accumulated deferred investment tax credits	57		59
Regulatory liabilities	1,099		1,041
Asset retirement obligations	378		366
Pension and other postretirement benefits	172		189
Other deferred credits and liabilities	42		37
Total deferred credits and other liabilities	4,361		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	1,860		1,842
Stockholder's equity	4,011		3,993
TOTAL LIABILITIES AND EQUITY	13,203		12,904
Ameren Illinois Company
Current Assets:
Cash and cash equivalents	2		1
Accounts receivable - trade (less allowance for doubtful accounts)	221		201
Unbilled revenue	85		135
Miscellaneous accounts and notes receivable	7		13
Materials and supplies	138		174
Current regulatory assets	61		38
Current accumulated deferred income taxes, net	77		45
Other current assets	14		26
Total current assets	605		633
Property and Plant, Net	5,882		5,589
Investments and Other Assets:
Goodwill	411		411
Regulatory assets	677		701
Other assets	144		120
Total investments and other assets	1,232		1,232
TOTAL ASSETS	7,719		7,454
Current Liabilities:
Borrowings from money pool			56
Short-term Debt	105
Accounts and wages payable	209		243
Accounts payable - affiliates	25		18
Taxes accrued	18		23
Customer deposits	75		79
Current environmental remediation	47		43
Current regulatory liabilities	179		159
Other current liabilities	121		150
Total current liabilities	779		771
Long-term Debt, Net	1,940		1,856
Deferred Credits and Other Liabilities:
Accumulated deferred income taxes, net	1,205		1,116
Accumulated deferred investment tax credits	4		4
Regulatory liabilities	685		664
Pension and other postretirement benefits	215		197
Environmental remediation	212		232
Other deferred credits and liabilities	152		166
Total deferred credits and other liabilities	2,473		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	491		410
Accumulated other comprehensive income (loss)	9		11
Stockholder's equity	2,527		2,448
TOTAL LIABILITIES AND EQUITY	$ 7,719		$ 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.” 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.