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Consolidated Statement Of Cash Flows (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Cash Flows From Operating Activities:      
Net income (loss) $ 295 $ (974) $ 526
(Income) Loss from discontinued operations, net of tax 223 1,496 (89)
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 666 633 602
Amortization of nuclear fuel 71 83 61
Amortization of debt issuance costs and premium/discounts 24 20 16
Deferred income taxes and investment tax credits, net 410 257 262
Allowance for equity funds used during construction (37) [1] (36) [1] (34) [1]
Share-based Compensation 27 29 17
Loss from regulatory disallowance       89
Other 23 (7) 1
Changes in assets and liabilities:      
Receivables (60) 30 200
Materials and supplies 60 (28) (29)
Accounts and wages payable 81 (34) (28)
Taxes accrued (195) (4) (5)
Assets, other 2 (6) 59
Liabilities, other 33 65 (85)
Pension and other postretirement benefits (28) (23) (100)
Counterparty collateral, net 41 41 36
Premiums paid on long-term debt repurchases    138   
Net cash provided by operating activities - continuing operations 1,636 1,404 1,499
Net cash provided by operating activities - discontinued operations 57 286 379
Net cash provided by operating activities 1,693 1,690 1,878
Cash Flows From Investing Activities:      
Capital expenditures (1,379) (1,063) (881)
Nuclear fuel expenditures (45) (91) (62)
Purchases of securities - nuclear decommissioning trust fund (214) (403) (220)
Sales and maturities of securities - nuclear decommissioning trust fund 196 384 199
Tax grants received related to renewable energy properties    18   
Other 2 2 15
Net cash used in investing activities - continuing operations (1,440) (1,153) (949)
Net cash used in investing activities - discontinued operations (283) (157) (99)
Net cash used in investing activities (1,723) (1,310) (1,048)
Cash Flows From Financing Activities:      
Dividends on common stock (388) (382) (375)
Dividends paid to noncontrolling interest holders (6) (6) (6)
Short-term debt and credit facility repayments, net 368 (148) (481)
Redemptions, repurchases, and maturities:      
Long-term debt (399) (760) (155)
Issuances:      
Long-term debt 278 882   
Common stock       65
Capital issuance costs (2) (16) 0
Advances received for construction 1 4 5
Repayments of advances received for construction (1)    (73)
Net cash provided by (used in) financing activities - continuing operations (149) (426) (1,020)
Net cash provided by (used in) financing activities - discontinued operations       (100)
Net cash provided by (used in) financing activities (149) (426) (1,120)
Net change in cash and cash equivalents (179) (46) (290)
Cash and cash equivalents at beginning of year 209 255 545
Cash and cash equivalents at end of year 30 209 255
Less: Cash and cash equivalents of discontinued operations at end of year    25 7
Cash and cash equivalents at beginning of year 184 248  
Cash and cash equivalents at end of year 30 184 248
Noncash financing activity – dividends on common stock    7   
Cash Paid (Refunded) During the Year:      
Interest net of capitalized 393 433 453
Income taxes, net 8 1 (61)
Union Electric Company
      
Cash Flows From Operating Activities:      
Net income (loss) 398 419 290
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 419 407 377
Amortization of nuclear fuel 71 83 61
FAC prudence review charge 26    18
Amortization of debt issuance costs and premium/discounts 7 6 6
Deferred income taxes and investment tax credits, net 65 287 155
Allowance for equity funds used during construction (31) (31) (30)
Loss from regulatory disallowance       89
Other 1 8 (8)
Changes in assets and liabilities:      
Receivables (59) 27 66
Materials and supplies 45 (48) (7)
Accounts and wages payable 42 (27) 12
Taxes accrued 100 (46) (6)
Assets, other 47 (35) 79
Liabilities, other 10 14 (48)
Pension and other postretirement benefits 2 2 2
Premiums paid on long-term debt repurchases    62   
Net cash provided by operating activities 1,143 1,004 1,056
Cash Flows From Investing Activities:      
Capital expenditures (648) (595) (550)
Nuclear fuel expenditures (45) (91) (62)
Purchases of securities - nuclear decommissioning trust fund (214) (403) (220)
Sales and maturities of securities - nuclear decommissioning trust fund 196 384 199
Money pool advances, net 24 (24)   
Tax grants received related to renewable energy properties    18   
Other    8 6
Net cash used in investing activities (687) (703) (627)
Cash Flows From Financing Activities:      
Dividends on common stock (460) (400) (403)
Dividends on preferred stock (3) (3) (3)
Money pool borrowings, net 105      
Redemptions, repurchases, and maturities:      
Long-term debt (249) (427) (5)
Issuances:      
Long-term debt    482   
Capital issuance costs    (7)   
Capital contribution from parent 4 1   
Repayments of advances received for construction       (19)
Net cash provided by (used in) financing activities (603) (354) (430)
Net change in cash and cash equivalents (147) (53) (1)
Cash and cash equivalents at beginning of year 148 201 202
Cash and cash equivalents at end of year 1 148 201
Cash Paid (Refunded) During the Year:      
Interest net of capitalized 212 220 210
Income taxes, net 86 (3) 9
Ameren Illinois Company
      
Cash Flows From Operating Activities:      
Net income (loss) 163 144 196
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 238 214 206
Amortization of debt issuance costs and premium/discounts 15 11 8
Deferred income taxes and investment tax credits, net 104 104 155
Allowance for equity funds used during construction (6) (5) (4)
Other 4 (11) (14)
Changes in assets and liabilities:      
Receivables 50 23 146
Materials and supplies 15 20 (21)
Accounts and wages payable 19 (21) (46)
Taxes accrued 28 3 (12)
Assets, other (53) 22 (3)
Liabilities, other 33 72 (30)
Pension and other postretirement benefits (8) (26) (101)
Counterparty collateral, net 43 40 20
Premiums paid on long-term debt repurchases    76   
Net cash provided by operating activities 651 519 504
Cash Flows From Investing Activities:      
Capital expenditures (701) (442) (351)
Returns from (advances to) ATXI for construction       49
Other 6 5 6
Net cash used in investing activities (695) (437) (296)
Cash Flows From Financing Activities:      
Dividends on common stock (110) (189) (327)
Dividends on preferred stock (3) (3) (3)
Money pool borrowings, net 32 24   
Redemptions, repurchases, and maturities:      
Long-term debt (150) (333) (150)
Issuances:      
Long-term debt 278 400   
Capital issuance costs (2) (6)   
Capital contribution from parent       19
Advances received for construction 1 4 5
Repayments of advances received for construction (1)    (53)
Net cash provided by (used in) financing activities 45 (103) (509)
Net change in cash and cash equivalents 1 (21) (301)
Cash and cash equivalents at beginning of year    21 322
Cash and cash equivalents at end of year 1    21
Cash Paid (Refunded) During the Year:      
Interest net of capitalized 112 125 137
Income taxes, net $ (23) $ (22) $ (14)
[1] Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.