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Consolidated Statement Of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cash Flows From Operating Activities:      
Net income (loss) $ 659 $ 636 $ 592
(Income) Loss from discontinued operations, net of tax 0 (51) 1
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for Callaway construction and operating license 0 69 0
Depreciation and amortization 835 777 710
Amortization of nuclear fuel 88 97 81
Amortization of debt issuance costs and premium/discounts 22 22 22
Deferred income taxes and investment tax credits, net 386 369 451
Allowance for equity funds used during construction [1] (27) (30) (34)
Share-based Compensation 17 24 25
Other 4 (10) (24)
Changes in assets and liabilities:      
Receivables (71) 83 31
Inventories 11 (14) 3
Accounts and wages payable 19 (2) 10
Taxes accrued 13 (22) (44)
Regulatory assets and liabilities 215 94 (281)
Assets, other (24) 53 30
Liabilities, other (10) (44) (14)
Pension and other postretirement benefits (16) (9) (10)
Counterparty collateral, net 3 (7) 22
Net cash provided by operating activities - continuing operations 2,124 2,035 1,571
Net cash provided by operating activities - discontinued operations (1) (4) (6)
Net cash provided by operating activities 2,123 2,031 1,565
Cash Flows From Investing Activities:      
Capital expenditures (2,076) (1,917) (1,785)
Nuclear fuel expenditures (55) (52) (74)
Purchases of securities - nuclear decommissioning trust fund (392) (363) (405)
Sales and maturities of securities - nuclear decommissioning trust fund 377 349 391
Proceeds from Collection of Notes Receivable 0 20 95
Contributions to Note Receivable 0 (8) (89)
Other 5 20 11
Net cash used in investing activities - continuing operations (2,141) (1,951) (1,856)
Net cash used in investing activities - discontinued operations 0 (25) 139
Net cash used in investing activities (2,141) (1,976) (1,717)
Cash Flows From Financing Activities:      
Dividends on common stock (416) (402) (390)
Dividends paid to noncontrolling interest holders (6) (6) (6)
Short-term debt, net 257 (413) 346
Maturities, redemptions, and repurchases of long-term debt (395) (120) (697)
Issuances of Long-term debt 389 1,197 898
Capital issuance costs (9) (12) (11)
Share-based payments (83) (12) (14)
Other (2) 0 1
Net cash provided by (used in) financing activities (265) 232 127
Net change in cash and cash equivalents (283) 287 (25)
Cash and cash equivalents at beginning of year 292 5 30
Cash and cash equivalents at end of year 9 292 5
Cash Paid (Refunded) During the Year:      
Interest net of capitalized 358 335 333
Income taxes, net (12) (15) (27)
Union Electric Company      
Cash Flows From Operating Activities:      
Net income (loss) 360 355 393
Adjustments to reconcile net income to net cash provided by operating activities:      
Provision for Callaway construction and operating license 0 69 0
Depreciation and amortization 506 476 442
Amortization of nuclear fuel 88 97 81
Amortization of debt issuance costs and premium/discounts 6 6 7
Deferred income taxes and investment tax credits, net 179 82 245
Allowance for equity funds used during construction (23) (22) (32)
Other 5 2 3
Changes in assets and liabilities:      
Receivables 5 72 (10)
Inventories (4) (39) 8
Accounts and wages payable (18) 3 25
Taxes accrued 11 1 (197)
Regulatory assets and liabilities 84 117 (68)
Assets, other (25) 26 52
Liabilities, other (1) 4 0
Pension and other postretirement benefits (4) (2) 1
Net cash provided by operating activities 1,169 1,247 950
Cash Flows From Investing Activities:      
Capital expenditures (738) (622) (747)
Nuclear fuel expenditures (55) (52) (74)
Purchases of securities - nuclear decommissioning trust fund (392) (363) (405)
Sales and maturities of securities - nuclear decommissioning trust fund 377 349 391
Money pool advances, net 125 36 0
Other (1) 0 (2)
Net cash used in investing activities (934) (724) (837)
Cash Flows From Financing Activities:      
Dividends on common stock (355) (575) (340)
Return of capital to parent 0 0 (215)
Dividends on preferred stock (3) (3) (3)
Short-term debt, net 0 (97) 97
Money pool borrowings, net 0 0 (105)
Maturities, redemptions, and repurchases of long-term debt (266) (120) (109)
Issuances of Long-term debt 149 249 350
Capital issuance costs (3) (3) (3)
Capital contribution from parent 44 224 215
Net cash provided by (used in) financing activities (434) (325) (113)
Net change in cash and cash equivalents (199) 198 0
Cash and cash equivalents at beginning of year 199 1 1
Cash and cash equivalents at end of year 0 199 1
Noncash Or Part Noncash Capital Contribution From Parent 0 38 9
Cash Paid (Refunded) During the Year:      
Interest net of capitalized 209 212 203
Income taxes, net 27 72 215
Ameren Illinois Company      
Cash Flows From Operating Activities:      
Net income (loss) 255 217 204
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation and amortization 318 292 259
Amortization of debt issuance costs and premium/discounts 14 14 13
Deferred income taxes and investment tax credits, net 154 221 196
Allowance for equity funds used during construction (4) (8) (2)
Other (1) (14) (19)
Changes in assets and liabilities:      
Receivables (72) 16 (13)
Inventories 15 25 (4)
Accounts and wages payable 12 37 7
Taxes accrued 1 (2) (7)
Regulatory assets and liabilities 120 (26) (215)
Assets, other (3) 17 15
Liabilities, other (5) (27) 1
Pension and other postretirement benefits (8) (4) (6)
Counterparty collateral, net 3 (3) 14
Net cash provided by operating activities 803 763 445
Cash Flows From Investing Activities:      
Capital expenditures (924) (918) (835)
Other 6 5 7
Net cash used in investing activities (918) (913) (828)
Cash Flows From Financing Activities:      
Dividends on common stock (110) 0 0
Dividends on preferred stock (3) (3) (3)
Short-term debt, net 51 (32) 32
Money pool borrowings, net 0 (15) (41)
Maturities, redemptions, and repurchases of long-term debt (129) 0 (163)
Issuances of Long-term debt 240 248 548
Capital issuance costs (4) (3) (6)
Capital contribution from parent 0 25 15
Other (1) 0 1
Net cash provided by (used in) financing activities 44 220 383
Net change in cash and cash equivalents (71) 70 0
Cash and cash equivalents at beginning of year 71 1 1
Cash and cash equivalents at end of year 0 71 1
Cash Paid (Refunded) During the Year:      
Interest net of capitalized 127 120 110
Income taxes, net $ 8 $ (113) $ (44)
[1] Includes amounts for Ameren registrant and nonregistrant subsidiaries and intercompany eliminations.