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Consolidated Statement Of Cash Flows (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Cash Flows From Operating Activities:      
Net income (loss) $ 526 $ 151 $ 624
Adjustments to reconcile net income to net cash provided by operating activities:      
Goodwill and other impairment charges 125 [1] 589 [1] 7 [1]
Gain on sales of properties (15) (10)  
Net mark-to-market (gain) loss on derivatives 11 (15) (23)
Depreciation and amortization 747 746 708
Amortization of nuclear fuel 61 54 53
Amortization of debt issuance costs and premium/discounts 21 23 25
Deferred income taxes and investment tax credits, net 346 410 290
Allowance for equity funds used during construction (34) [2] (52) [2] (36) [2]
Other   21 (24)
Changes in assets and liabilities:      
Receivables 231 (197) 136
Materials and supplies (27) 73 63
Accounts and wages payable (36) 20 (40)
Taxes accrued (3) 10 1
Assets, other 76 (47) 11
Liabilities, other (75) 71 91
Pension and other postretirement benefits (102) (5) (9)
Counterparty collateral, net 27 (73) (17)
Taum Sauk insurance recoveries, net of cost (1) 54 107
Net cash provided by operating activities 1,878 1,823 1,967
Cash Flows From Investing Activities:      
Capital expenditures (1,030) (1,042) (1,710)
Nuclear fuel expenditures (62) (68) (72)
Purchases of securities - nuclear decommissioning trust fund (220) (271) (383)
Sales of securities - nuclear decommissioning trust fund 199 256 380
Proceeds from sales of properties 53 27 2
Other 12 2 2
Net cash used in investing activities (1,048) (1,096) (1,781)
Cash Flows From Financing Activities:      
Dividends on common stock (375) (368) (338)
Dividends paid to noncontrolling interest holders (6) (8) (21)
Capital issuance costs   (15) (65)
Short-term debt and credit facility repayments, net (581) (121) (324)
Redemptions, repurchases, and maturities:      
Long-term debt (155) (310) (631)
Preferred stock   (52)  
Issuances:      
Common stock 65 80 634
Long-term debt     1,021
Repayments of generator advances received for construction (73) (39)  
Generator advances received for construction 5 29 68
Net cash provided by (used in) financing activities (1,120) (804) 344
Net change in cash and cash equivalents (290) (77) 530
Cash and cash equivalents at beginning of year 545 622 92
Cash and cash equivalents at end of year 255 545 622
Cash Paid (Refunded) During the Year:      
Interest net of capitalized 453 494 485
Income taxes, net (61) (92) 9
Union Electric Company [Member]
      
Cash Flows From Operating Activities:      
Net income (loss) 290 369 265
Adjustments to reconcile net income to net cash provided by operating activities:      
Gain on sales of properties (3) (5)  
Loss from regulatory disallowance 89    
Net mark-to-market (gain) loss on derivatives 1 (1) (29)
Depreciation and amortization 377 355 333
Amortization of nuclear fuel 61 54 53
Amortization of debt issuance costs and premium/discounts 6 4 10
Deferred income taxes and investment tax credits, net 155 292 212
Allowance for equity funds used during construction (30) (50) (33)
Other (6) 10  
Changes in assets and liabilities:      
Receivables 66 (122) 7
Materials and supplies (7) 7 (2)
Accounts and wages payable 13 (24) 18
Taxes accrued (6) 55 1
Assets, other 79 (101) (34)
Liabilities, other (30) 75 69
Pension and other postretirement benefits 2 (3) (2)
Taum Sauk insurance recoveries, net of cost (1) 54 107
Net cash provided by operating activities 1,056 969 975
Cash Flows From Investing Activities:      
Capital expenditures (550) (624) (882)
Nuclear fuel expenditures (62) (68) (72)
Purchases of securities - nuclear decommissioning trust fund (220) (271) (383)
Sales of securities - nuclear decommissioning trust fund 199 256 380
Other 6 7  
Net cash used in investing activities (627) (700) (957)
Cash Flows From Financing Activities:      
Dividends on common stock (403) (235) (175)
Dividends on preferred stock (3) (5) (6)
Capital issuance costs   (4) (14)
Short-term debt and credit facility repayments, net     (251)
Note payable - affiliates     (92)
Redemptions, repurchases, and maturities:      
Long-term debt (5) (70) (4)
Preferred stock   (33)  
Issuances:      
Long-term debt     349
Generator advances received for construction (19) 13 6
Capital contribution from parent     436
Net cash provided by (used in) financing activities (430) (334) 249
Net change in cash and cash equivalents (1) (65) 267
Cash and cash equivalents at beginning of year 202 267  
Cash and cash equivalents at end of year 201 202 267
Cash Paid (Refunded) During the Year:      
Interest net of capitalized 210 213 212
Income taxes, net 9 (106) (208)
Ameren Illinois Company [Member]
      
Cash Flows From Operating Activities:      
Net income (loss) 196 252 247 [3],[4]
Income from discontinued operations, net of tax   (40) (114) [3],[4]
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 206 201 195 [3]
Amortization of debt issuance costs and premium/discounts 8 10 9 [3]
Deferred income taxes and investment tax credits, net 155 210 23 [3]
Other (14) (3) (40) [3]
Changes in assets and liabilities:      
Receivables 146 (84) 187 [3]
Materials and supplies (21) 9 81 [3]
Accounts and wages payable (46) (44) (3) [3]
Taxes accrued (12) 11 (11) [3]
Assets, other (3) 32 27 [3]
Liabilities, other (30) 33 6 [3]
Pension and other postretirement benefits (101) (7) 5 [3]
Counterparty collateral, net 20 (100) 92 [3]
Operating cash flows provided by discontinued operations   113 141 [3]
Net cash provided by operating activities 504 593 845 [3]
Cash Flows From Investing Activities:      
Capital expenditures (351) (281) (352) [3]
Returns from (advances to) ATXI for construction 49 (10) (47) [3]
Proceeds from intercompany note receivable   45 42 [3]
Other 6 5 6 [3]
Capital expenditures of discontinued operations   (6) (91) [3]
Net cash used in investing activities (296) (247) (442) [3]
Cash Flows From Financing Activities:      
Dividends on common stock (327) (133) (98) [3]
Dividends on preferred stock (3) (4) (6) [3]
Capital issuance costs   (4) (13) [3]
Short-term debt and credit facility repayments, net     (62) [3]
Redemptions, repurchases, and maturities:      
Long-term debt (150) (40) (250) [3]
Preferred stock   (19)  
Issuances:      
Repayments of generator advances received for construction (53) (39) (2) [3]
Generator advances received for construction 5 16 62 [3]
Net financing activities provided by (used in) discontinued operations   (107) (50) [3]
Capital contribution from parent 19    272 [3]
Net cash provided by (used in) financing activities (509) (330) (147) [3]
Net change in cash and cash equivalents (301) 16 256 [3]
Cash and cash equivalents at beginning of year 322 306 [3] 50 [3]
Cash and cash equivalents at end of year 21 322 306 [3]
Cash Paid (Refunded) During the Year:      
Interest net of capitalized 137 160 167 [3]
Income taxes, net (14) (39) 129 [3]
Noncash investing activity - asset transfer from ATXI   7 29 [3]
Noncash financing activity - capital contribution from parent   6  
Ameren Energy Generating Company [Member]
      
Cash Flows From Operating Activities:      
Net income (loss) 45 (36) 162 [5]
Adjustments to reconcile net income to net cash provided by operating activities:      
Goodwill and other impairment charges 35 170 6 [5]
Gain on sales of properties (12) (5)  
Net mark-to-market (gain) loss on derivatives 2 (8) (27) [5]
Depreciation and amortization 98 113 106 [5]
Amortization of debt issuance costs and premium/discounts 3 3 2 [5]
Deferred income taxes and investment tax credits, net 64 15 64 [5]
Other 1 6  
Changes in assets and liabilities:      
Receivables 19 38 (13) [5]
Materials and supplies 5 42 (12) [5]
Accounts and wages payable (15) (25) (19) [5]
Taxes accrued   3  
Assets, other 2 7 9 [5]
Liabilities, other (30) (24) (26) [5]
Pension and other postretirement benefits (2) 5 1 [5]
Net cash provided by operating activities 215 304 253 [5]
Cash Flows From Investing Activities:      
Capital expenditures (141) (95) (316) [5]
Proceeds from sales of properties 49 18  
Money pool advances, net (49) 48 (73) [5]
Net cash used in investing activities (141) (29) (389) [5]
Cash Flows From Financing Activities:      
Dividends on common stock     (43) [5]
Dividends paid to noncontrolling interest holders     (11) [5]
Capital issuance costs   (4) (7) [5]
Short-term debt and credit facility repayments, net (100) 100  
Note payable - affiliates   (176) 31 [5]
Money pool borrowings, net     (80) [5]
Redemptions of long-term debt   (200)  
Issuances:      
Long-term debt     249 [5]
Capital contribution from parent 28 5  
Net cash provided by (used in) financing activities (72) (275) 139 [5]
Net change in cash and cash equivalents 2   3 [5]
Cash and cash equivalents at beginning of year 6 6 [5] 3 [5]
Cash and cash equivalents at end of year 8 6 6 [5]
Cash Paid (Refunded) During the Year:      
Interest net of capitalized 60 77 58 [5]
Income taxes, net (25) 1 74 [5]
Noncash financing activity - capital contribution from parent   $ 24  
[1] Includes amounts for registrant and nonregistrant subsidiaries.
[2] Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations
[3] Prior period has been adjusted to reflect the Ameren Illinois Merger as discussed in Note 1 - Summary of Significant Accounting Policies.
[4] Prior period has been adjusted to reflect the AIC Merger as discussed in Note 1 - Summary of Significant Accounting Policies.
[5] Prior period has been adjusted to include EEI as discussed in Note 1 - Summary of Significant Accounting Policies.