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Consolidated Balance Sheet (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Current Assets:    
Cash and cash equivalents $ 30 $ 184
Accounts receivable - trade (less allowance for doubtful accounts) 404 354
Unbilled revenue 304 291
Miscellaneous accounts and notes receivable 196 71
Materials and supplies 526 570
Current regulatory assets 156 247
Current accumulated deferred income taxes, net 106 170
Other current assets 85 98
Assets of discontinued operations (Note 16) 165 1,611
Total current assets 1,972 3,596
Property, Plant and Equipment, Net 16,205 [1],[2] 15,348 [1],[2]
Investments and Other Assets:    
Nuclear decommissioning trust fund 494 408
Goodwill 411 411
Intangible assets 22 14
Regulatory assets 1,240 1,786
Other assets 698 667
Total investments and other assets 2,865 3,286
TOTAL ASSETS 21,042 22,230
Current Liabilities:    
Current maturities of long-term debt 534 355
Short-term debt 368   
Accounts and wages payable 806 533
Taxes accrued 55 49
Interest accrued 86 89
Customer deposits 105 107
Mark-to-market derivative liabilities 52 92
Current regulatory liabilities 216 100
Other current liabilities 194 168
Liabilities of discontinued operations (Note 16) 45 1,193
Total current liabilities 2,461 2,686
Long-term Debt, Net 5,504 5,802
Deferred Credits and Other Liabilities:    
Accumulated deferred income taxes, net 3,166 3,186
Accumulated deferred investment tax credits 63 70
Regulatory liabilities 1,705 1,589
Asset retirement obligations 369 349
Pension and other postretirement benefits 466 1,138
Other deferred credits and liabilities 622 643
Total deferred credits and other liabilities 6,391 6,975
Commitments and Contingencies (Notes 2, 10, 14 and 15)      
Stockholders' Equity:    
Common stock 2 2
Other paid-in capital, principally premium on common stock 5,632 5,616
Preferred stock not subject to mandatory redemption 142 142
Retained earnings 907 1,006
Accumulated other comprehensive income (loss) 3 (8)
Total stockholders' equity 6,544 6,616
Noncontrolling Interests 142 151
Total equity 6,686 6,767
TOTAL LIABILITIES AND EQUITY 21,042 22,230
Union Electric Company
    
Current Assets:    
Cash and cash equivalents 1 148
Advances to money pool    24
Accounts receivable - trade (less allowance for doubtful accounts) 191 161
Accounts receivable - affiliates 1 4
Unbilled revenue 168 145
Miscellaneous accounts and notes receivable 57 48
Materials and supplies 352 397
Current regulatory assets 118 163
Current accumulated deferred income taxes, net 20 26
Other current assets 71 69
Total current assets 959 1,159
Property, Plant and Equipment, Net 10,452 [1] 10,161 [1]
Investments and Other Assets:    
Nuclear decommissioning trust fund 494 408
Intangible assets 22 14
Regulatory assets 534 852
Other assets 443 449
Total investments and other assets 1,493 1,723
TOTAL ASSETS 12,904 13,043
Current Liabilities:    
Current maturities of long-term debt 109 205
Due to Related Parties, Current 105   
Accounts and wages payable 387 345
Accounts payable - affiliates 30 66
Taxes accrued 220 28
Interest accrued 57 60
Current regulatory liabilities 57 18
Other current liabilities 82 77
Total current liabilities 1,047 799
Long-term Debt, Net 3,648 3,801
Deferred Credits and Other Liabilities:    
Accumulated deferred income taxes, net 2,509 2,443
Accumulated deferred investment tax credits 59 64
Regulatory liabilities 1,041 917
Asset retirement obligations 366 346
Pension and other postretirement benefits 189 461
Other deferred credits and liabilities 52 158
Total deferred credits and other liabilities 4,216 4,389
Commitments and Contingencies (Notes 2, 10, 14 and 15)      
Stockholders' Equity:    
Common stock 511 511
Other paid-in capital, principally premium on common stock 1,560 1,556
Preferred stock not subject to mandatory redemption 80 80
Retained earnings 1,842 1,907
Total stockholders' equity 3,993 4,054
TOTAL LIABILITIES AND EQUITY 12,904 13,043
Ameren Illinois Company
    
Current Assets:    
Cash and cash equivalents 1   
Accounts receivable - trade (less allowance for doubtful accounts) 201 182
Accounts receivable - affiliates    10
Unbilled revenue 135 146
Miscellaneous accounts and notes receivable 13 22
Materials and supplies 174 173
Current regulatory assets 38 84
Current accumulated deferred income taxes, net 45 85
Other current assets 26 47
Total current assets 633 749
Property, Plant and Equipment, Net 5,589 5,052
Investments and Other Assets:    
Intercompany tax receivable – Genco    39
Goodwill 411 411
Regulatory assets 701 934
Other assets 120 97
Total investments and other assets 1,232 1,481
TOTAL ASSETS 7,454 7,282
Current Liabilities:    
Current maturities of long-term debt    150
Borrowings from money pool 56 24
Accounts and wages payable 243 146
Accounts payable - affiliates 18 86
Taxes accrued 23 18
Customer deposits 79 85
Mark-to-market derivative liabilities 36 77
Environmental remediation 43 37
Current regulatory liabilities 159 82
Other current liabilities 114 92
Total current liabilities 771 797
Long-term Debt, Net 1,856 1,577
Deferred Credits and Other Liabilities:    
Accumulated deferred income taxes, net 1,116 1,025
Accumulated deferred investment tax credits 4 5
Regulatory liabilities 664 672
Pension and other postretirement benefits 197 406
Accrued Environmental Loss Contingencies, Noncurrent 232 216
Other deferred credits and liabilities 166 183
Total deferred credits and other liabilities 2,379 2,507
Commitments and Contingencies (Notes 2, 10, 14 and 15)      
Stockholders' Equity:    
Common stock 0 0
Other paid-in capital, principally premium on common stock 1,965 1,965
Preferred stock not subject to mandatory redemption 62 62
Retained earnings 410 360
Accumulated other comprehensive income (loss) 11 14
Total stockholders' equity 2,448 2,401
TOTAL LIABILITIES AND EQUITY $ 7,454 $ 7,282
[1] (a)Amounts in Ameren and Ameren Missouri include two electric generation CTs under separate capital lease agreements. The gross cumulative asset value of those agreements was $228 million at December 31, 2013, and $228 million at December 31, 2012. The total accumulated depreciation associated with the two CTs was $56 million and $52 million at December 31, 2013, and 2012, respectively. In addition, Ameren Missouri has investments in debt securities, which were classified as held-to-maturity, related to the two CTs from the city of Bowling Green and Audrain County. As of December 31, 2013, and 2012, the carrying value of these debt securities was $299 million and $304 million, respectively.
[2] (b)Includes amounts for Ameren registrant and nonregistrant subsidiaries.