Document and Entity Information
Document and Entity Information - shares | 9 Months Ended | |
Sep. 30, 2020 | Oct. 30, 2020 | |
Entity Information [Line Items] | ||
Document Type | 10-Q | |
Document Quarterly Report | true | |
Document Period End Date | Sep. 30, 2020 | |
Document Transition Report | false | |
Entity File Number | 1-14756 | |
Entity Registrant Name | Ameren Corporation | |
Entity Tax Identification Number | 43-1723446 | |
Entity Incorporation, State or Country Code | MO | |
Entity Address, Address Line One | 1901 Chouteau Avenue | |
Entity Address, City or Town | St. Louis | |
Entity Address, State or Province | MO | |
Entity Address, Postal Zip Code | 63103 | |
City Area Code | (314) | |
Local Phone Number | 621-3222 | |
Title of 12(b) Security | Common Stock, $0.01 par value per share | |
Trading Symbol(s) | AEE | |
Security Exchange Name | NYSE | |
Entity Current Reporting Status | Yes | |
Entity Interactive Data Current | Yes | |
Entity Filer Category | Large Accelerated Filer | |
Entity Small Business | false | |
Entity Emerging Growth Company | false | |
Entity Shell Company | false | |
Entity Common Stock, Shares Outstanding | 247,206,978 | |
Entity Central Index Key | 0001002910 | |
Current Fiscal Year End Date | --12-31 | |
Document Fiscal Year Focus | 2020 | |
Document Fiscal Period Focus | Q3 | |
Amendment Flag | false | |
Union Electric Company | ||
Entity Information [Line Items] | ||
Entity File Number | 1-2967 | |
Entity Registrant Name | Union Electric Company | |
Entity Tax Identification Number | 43-0559760 | |
Entity Incorporation, State or Country Code | MO | |
Entity Address, Address Line One | 1901 Chouteau Avenue | |
Entity Address, City or Town | St. Louis | |
Entity Address, State or Province | MO | |
Entity Address, Postal Zip Code | 63103 | |
City Area Code | (314) | |
Local Phone Number | 621-3222 | |
Entity Current Reporting Status | Yes | |
Entity Interactive Data Current | Yes | |
Entity Filer Category | Non-accelerated Filer | |
Entity Small Business | false | |
Entity Emerging Growth Company | false | |
Entity Shell Company | false | |
Entity Common Stock, Shares Outstanding | 102,123,834 | |
Entity Central Index Key | 0000100826 | |
Current Fiscal Year End Date | --12-31 | |
Document Fiscal Year Focus | 2020 | |
Document Fiscal Period Focus | Q3 | |
Amendment Flag | false | |
Ameren Illinois Company | ||
Entity Information [Line Items] | ||
Entity File Number | 1-3672 | |
Entity Registrant Name | Ameren Illinois Company | |
Entity Tax Identification Number | 37-0211380 | |
Entity Incorporation, State or Country Code | IL | |
Entity Address, Address Line One | 10 Executive Drive | |
Entity Address, City or Town | Collinsville | |
Entity Address, State or Province | IL | |
Entity Address, Postal Zip Code | 62234 | |
City Area Code | (618) | |
Local Phone Number | 343-8150 | |
Entity Current Reporting Status | Yes | |
Entity Interactive Data Current | Yes | |
Entity Filer Category | Non-accelerated Filer | |
Entity Small Business | false | |
Entity Emerging Growth Company | false | |
Entity Shell Company | false | |
Entity Common Stock, Shares Outstanding | 25,452,373 | |
Entity Central Index Key | 0000018654 | |
Current Fiscal Year End Date | --12-31 | |
Document Fiscal Year Focus | 2020 | |
Document Fiscal Period Focus | Q3 | |
Amendment Flag | false |
Consolidated Statement of Incom
Consolidated Statement of Income (Loss) and Comprehensive Income - USD ($) shares in Millions, $ in Millions | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | |
Operating Revenues: | ||||
Revenue from Contract with Customer, Including Assessed Tax | $ 1,628 | $ 1,659 | $ 4,466 | $ 4,594 |
Operating Expenses: | ||||
Fuel | 141 | 147 | 400 | 409 |
Purchased Power | 140 | 148 | 383 | 440 |
Natural gas purchased for resale | 34 | 31 | 183 | 236 |
Other operations and maintenance | 418 | 434 | 1,240 | 1,301 |
Depreciation and amortization | 273 | 248 | 799 | 745 |
Taxes other than income taxes | 128 | 131 | 372 | 375 |
Total operating expenses | 1,134 | 1,139 | 3,377 | 3,506 |
Operating Income | 494 | 520 | 1,089 | 1,088 |
Other Income (Expense), Net | 48 | 34 | 117 | 99 |
Interest Charges | 110 | 96 | 311 | 290 |
Income Before Income Taxes | 432 | 458 | 895 | 897 |
Income Taxes | 63 | 92 | 134 | 158 |
Net income | 369 | 366 | 761 | 739 |
Less: Net Income Attributable to Noncontrolling Interests | 2 | 2 | 5 | 5 |
Net income attributable to Ameren common shareholders | 367 | 364 | 756 | 734 |
Pension and other postretirement benefit plan activity, net of income taxes (benefit) | 1 | 0 | 2 | 1 |
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest | 370 | 366 | 763 | 740 |
Comprehensive Income (Loss), Net of Tax, Attributable to Noncontrolling Interest | 2 | 2 | 5 | 5 |
Comprehensive Income | $ 368 | $ 364 | $ 758 | $ 735 |
Earnings Per Share, Basic and Diluted [Abstract] | ||||
Earnings Per Share, Basic | $ 1.48 | $ 1.48 | $ 3.06 | $ 2.99 |
Earnings Per Share, Diluted | $ 1.47 | $ 1.47 | $ 3.04 | $ 2.97 |
Average Common Shares Outstanding - Basic (in shares) | 247.1 | 245.9 | 246.8 | 245.5 |
Weighted Average Number of Shares Outstanding, Diluted (in shares) | 249.2 | 247.5 | 248.4 | 247 |
Electricity | ||||
Operating Revenues: | ||||
Revenue from Contract with Customer, Including Assessed Tax | $ 1,489 | $ 1,528 | $ 3,846 | $ 3,928 |
Natural Gas | ||||
Operating Revenues: | ||||
Revenue from Contract with Customer, Including Assessed Tax | 139 | 131 | 620 | 666 |
Union Electric Company | ||||
Operating Revenues: | ||||
Revenue from Contract with Customer, Including Assessed Tax | 1,001 | 1,059 | 2,473 | 2,615 |
Operating Expenses: | ||||
Fuel | 141 | 147 | 400 | 409 |
Purchased Power | 48 | 49 | 124 | 160 |
Natural gas purchased for resale | 5 | 6 | 29 | 41 |
Other operations and maintenance | 221 | 242 | 662 | 720 |
Depreciation and amortization | 154 | 138 | 448 | 417 |
Taxes other than income taxes | 92 | 96 | 254 | 256 |
Total operating expenses | 661 | 678 | 1,917 | 2,003 |
Operating Income | 340 | 381 | 556 | 612 |
Other Income (Expense), Net | 26 | 15 | 55 | 43 |
Interest Charges | 50 | 44 | 140 | 136 |
Income Before Income Taxes | 316 | 352 | 471 | 519 |
Income Taxes | 18 | 51 | 29 | 70 |
Net income | 298 | 301 | 442 | 449 |
Preferred Stock Dividends | 1 | 1 | 3 | 3 |
Net Income (Loss) Attributable to Parent | 297 | 300 | 439 | 446 |
Union Electric Company | Electricity | ||||
Operating Revenues: | ||||
Revenue from Contract with Customer, Including Assessed Tax | 984 | 1,040 | 2,386 | 2,517 |
Union Electric Company | Natural Gas | ||||
Operating Revenues: | ||||
Revenue from Contract with Customer, Including Assessed Tax | 17 | 19 | 87 | 98 |
Ameren Illinois Company | ||||
Operating Revenues: | ||||
Revenue from Contract with Customer, Including Assessed Tax | 589 | 564 | 1,879 | 1,873 |
Operating Expenses: | ||||
Purchased Power | 97 | 101 | 271 | 284 |
Natural gas purchased for resale | 29 | 25 | 154 | 195 |
Other operations and maintenance | 197 | 193 | 578 | 580 |
Depreciation and amortization | 109 | 102 | 323 | 304 |
Taxes other than income taxes | 33 | 33 | 107 | 110 |
Total operating expenses | 465 | 454 | 1,433 | 1,473 |
Operating Income | 124 | 110 | 446 | 400 |
Other Income (Expense), Net | 17 | 13 | 45 | 39 |
Interest Charges | 39 | 38 | 116 | 111 |
Income Before Income Taxes | 102 | 85 | 375 | 328 |
Income Taxes | 25 | 20 | 93 | 79 |
Net income | 77 | 65 | 282 | 249 |
Preferred Stock Dividends | 0 | 0 | 2 | 2 |
Net Income (Loss) Attributable to Parent | 77 | 65 | 280 | 247 |
Ameren Illinois Company | Electricity | ||||
Operating Revenues: | ||||
Revenue from Contract with Customer, Including Assessed Tax | 467 | 452 | 1,346 | 1,305 |
Ameren Illinois Company | Natural Gas | ||||
Operating Revenues: | ||||
Revenue from Contract with Customer, Including Assessed Tax | $ 122 | $ 112 | $ 533 | $ 568 |
Consolidated Statement of Inc_2
Consolidated Statement of Income (Loss) and Comprehensive Income (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | |
Income Statement [Abstract] | ||||
Pension and other postretirement benefit plan activity, tax | $ 0 | $ 0 | $ 0 | $ 0 |
Consolidated Balance Sheet
Consolidated Balance Sheet - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 |
Current Assets: | ||
Cash and cash equivalents | $ 6 | $ 16 |
Accounts receivable - trade (less allowance for doubtful accounts) | 525 | 393 |
Unbilled revenue | 221 | 278 |
Miscellaneous accounts receivable | 71 | 63 |
Inventories | 557 | 494 |
Other current assets | 210 | 187 |
Total current assets | 1,590 | 1,431 |
Property, Plant, and Equipment, Net | 25,541 | 24,376 |
Investments and Other Assets: | ||
Nuclear decommissioning trust fund | 904 | 847 |
Goodwill | 411 | 411 |
Regulatory assets | 1,078 | 992 |
Other assets | 993 | 876 |
Total investments and other assets | 3,386 | 3,126 |
TOTAL ASSETS | 30,517 | 28,933 |
Current Liabilities: | ||
Current maturities of long-term debt | 357 | 442 |
Short-term debt | 272 | 440 |
Accounts and wages payable | 640 | 874 |
Taxes accrued | 199 | 37 |
Customer deposits | 109 | 111 |
Current regulatory liabilities | 96 | 164 |
Other current liabilities | 432 | 437 |
Total current liabilities | 2,105 | 2,505 |
Long-term Debt, Net | 10,172 | 8,915 |
Deferred Credits and Other Liabilities: | ||
Accumulated deferred income taxes and investment tax credits, net | 3,151 | 2,919 |
Regulatory liabilities | 4,972 | 4,887 |
Asset retirement obligations | 675 | 638 |
Pension and other postretirement benefits | 373 | 401 |
Other deferred credits and liabilities | 438 | 467 |
Total deferred credits and other liabilities | 9,609 | 9,312 |
Commitments and Contingencies | ||
Shareholders’ Equity: | ||
Common Stock | 2 | 2 |
Other paid-in capital, principally premium on common stock | 5,733 | 5,694 |
Retained earnings | 2,769 | 2,380 |
Accumulated other comprehensive loss | (15) | (17) |
Total shareholders’ equity | 8,489 | 8,059 |
Noncontrolling Interests | 142 | 142 |
Total equity | 8,631 | 8,201 |
TOTAL LIABILITIES AND EQUITY | 30,517 | 28,933 |
Union Electric Company | ||
Current Assets: | ||
Cash and cash equivalents | 0 | 9 |
Advances to money pool | 5 | 0 |
Accounts receivable - trade (less allowance for doubtful accounts) | 263 | 164 |
Accounts receivable – affiliates | 12 | 30 |
Unbilled revenue | 117 | 139 |
Miscellaneous accounts receivable | 44 | 33 |
Inventories | 408 | 373 |
Other current assets | 119 | 66 |
Total current assets | 968 | 814 |
Property, Plant, and Equipment, Net | 12,991 | 12,635 |
Investments and Other Assets: | ||
Nuclear decommissioning trust fund | 904 | 847 |
Regulatory assets | 310 | 285 |
Other assets | 350 | 356 |
Total investments and other assets | 1,564 | 1,488 |
TOTAL ASSETS | 15,523 | 14,937 |
Current Liabilities: | ||
Current maturities of long-term debt | 7 | 92 |
Short-term debt | 0 | 234 |
Accounts and wages payable | 256 | 465 |
Accounts payable – affiliates | 70 | 52 |
Taxes accrued | 164 | 24 |
Interest accrued | 59 | 48 |
Current asset retirement obligations | 53 | 53 |
Current regulatory liabilities | 40 | 62 |
Other current liabilities | 102 | 96 |
Total current liabilities | 751 | 1,126 |
Long-term Debt, Net | 4,561 | 4,098 |
Deferred Credits and Other Liabilities: | ||
Accumulated deferred income taxes and investment tax credits, net | 1,689 | 1,612 |
Regulatory liabilities | 2,898 | 2,937 |
Asset retirement obligations | 670 | 634 |
Pension and other postretirement benefits | 129 | 141 |
Other deferred credits and liabilities | 37 | 40 |
Total deferred credits and other liabilities | 5,423 | 5,364 |
Commitments and Contingencies | ||
Shareholders’ Equity: | ||
Common Stock | 511 | 511 |
Other paid-in capital, principally premium on common stock | 2,027 | 2,027 |
Preferred stock | 80 | 80 |
Retained earnings | 2,170 | 1,731 |
Total shareholders’ equity | 4,788 | 4,349 |
TOTAL LIABILITIES AND EQUITY | 15,523 | 14,937 |
Ameren Illinois Company | ||
Current Assets: | ||
Cash and cash equivalents | 0 | 0 |
Accounts receivable - trade (less allowance for doubtful accounts) | 247 | 215 |
Accounts receivable – affiliates | 15 | 28 |
Unbilled revenue | 104 | 139 |
Miscellaneous accounts receivable | 24 | 25 |
Inventories | 149 | 121 |
Current regulatory assets | 29 | 57 |
Other current assets | 31 | 29 |
Total current assets | 599 | 614 |
Property, Plant, and Equipment, Net | 10,861 | 10,083 |
Investments and Other Assets: | ||
Goodwill | 411 | 411 |
Regulatory assets | 748 | 694 |
Other assets | 480 | 383 |
Total investments and other assets | 1,639 | 1,488 |
TOTAL ASSETS | 13,099 | 12,185 |
Current Liabilities: | ||
Short-term debt | 242 | 53 |
Accounts and wages payable | 318 | 299 |
Accounts payable – affiliates | 43 | 82 |
Customer deposits | 80 | 77 |
Current regulatory liabilities | 47 | 84 |
Other current liabilities | 234 | 249 |
Total current liabilities | 964 | 844 |
Long-term Debt, Net | 3,576 | 3,575 |
Deferred Credits and Other Liabilities: | ||
Accumulated deferred income taxes and investment tax credits, net | 1,314 | 1,224 |
Regulatory liabilities | 1,968 | 1,849 |
Pension and other postretirement benefits | 204 | 214 |
Environmental remediation | 66 | 87 |
Other deferred credits and liabilities | 245 | 260 |
Total deferred credits and other liabilities | 3,797 | 3,634 |
Commitments and Contingencies | ||
Shareholders’ Equity: | ||
Common Stock | 0 | 0 |
Other paid-in capital, principally premium on common stock | 2,538 | 2,188 |
Preferred stock | 62 | 62 |
Retained earnings | 2,162 | 1,882 |
Total shareholders’ equity | 4,762 | 4,132 |
TOTAL LIABILITIES AND EQUITY | $ 13,099 | $ 12,185 |
Consolidated Balance Sheet (Par
Consolidated Balance Sheet (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 |
Accounts Receivable, Allowance for Credit Loss, Current | $ 44 | $ 17 |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01 |
Common stock, shares authorized (in shares) | 400,000,000 | 400,000,000 |
Common Stock, Shares, Outstanding | 247,200,000 | 246,200,000 |
Union Electric Company | ||
Accounts Receivable, Allowance for Credit Loss, Current | $ 14 | $ 7 |
Common stock, par value (in dollars per share) | $ 5,000,000 | $ 5,000,000 |
Common stock, shares authorized (in shares) | 150,000,000 | 150,000,000 |
Common Stock, Shares, Outstanding | 102,100,000 | 102,100,000 |
Ameren Illinois Company | ||
Accounts Receivable, Allowance for Credit Loss, Current | $ 30 | $ 10 |
Common stock, no par value (in dollars per share) | $ 0 | $ 0 |
Common stock, shares authorized (in shares) | 45,000,000 | 45,000,000 |
Common Stock, Shares, Outstanding | 25,500,000 | 25,500,000 |
Consolidated Statement of Cash
Consolidated Statement of Cash Flows - USD ($) $ in Millions | 9 Months Ended | |
Sep. 30, 2020 | Sep. 30, 2019 | |
Cash Flows From Operating Activities: | ||
Net income | $ 761 | $ 739 |
Adjustments to reconcile net income to net cash provided by operating activities: | ||
Depreciation and amortization | 802 | 745 |
Amortization of nuclear fuel | 68 | 56 |
Amortization of debt issuance costs and premium/discounts | 16 | 14 |
Deferred income taxes and investment tax credits, net | 125 | 144 |
Allowance for equity funds used during construction | (25) | (20) |
Stock-based compensation costs | 16 | 15 |
Other | 14 | (11) |
Changes in assets and liabilities: | ||
Receivables | (113) | 10 |
Inventories | (61) | (4) |
Accounts and wages payable | (190) | (205) |
Taxes accrued | 154 | 118 |
Regulatory assets and liabilities | (55) | 147 |
Assets, other | (66) | (56) |
Liabilities, other | (76) | 11 |
Pension and other postretirement benefits | (41) | (35) |
Net cash provided by operating activities | 1,329 | 1,668 |
Cash Flows From Investing Activities: | ||
Capital expenditures | (1,884) | (1,761) |
Nuclear fuel expenditures | (61) | (26) |
Purchases of securities – nuclear decommissioning trust fund | (169) | (192) |
Sales and maturities of securities – nuclear decommissioning trust fund | 135 | 184 |
Purchase of bonds | 0 | (207) |
Proceeds from sale of remarketed bonds | 0 | 207 |
Other | (2) | (3) |
Net cash used in investing activities | (1,981) | (1,798) |
Cash Flows From Financing Activities: | ||
Dividends on common stock | (367) | (350) |
Dividends paid to noncontrolling interest holders | (5) | (5) |
Short-term debt, net | (168) | (53) |
Maturities of long-term debt | (85) | (329) |
Issuances of long-term debt | 1,263 | 900 |
Issuances of common stock | 37 | 54 |
Employee payroll taxes related to stock-based compensation | (20) | (29) |
Debt issuance costs | (11) | (10) |
Net cash provided by financing activities | 644 | 178 |
Net change in cash, cash equivalents, and restricted cash | (8) | 48 |
Cash, cash equivalents, and restricted cash at beginning of year | 176 | 107 |
Cash, cash equivalents, and restricted cash at end of period | 168 | 155 |
Union Electric Company | ||
Cash Flows From Operating Activities: | ||
Net income | 442 | 449 |
Adjustments to reconcile net income to net cash provided by operating activities: | ||
Depreciation and amortization | 452 | 419 |
Amortization of nuclear fuel | 68 | 56 |
Amortization of debt issuance costs and premium/discounts | 4 | 4 |
Deferred income taxes and investment tax credits, net | (1) | (9) |
Allowance for equity funds used during construction | (15) | (14) |
Other | 13 | 10 |
Changes in assets and liabilities: | ||
Receivables | (93) | (32) |
Inventories | (33) | 3 |
Accounts and wages payable | (168) | (153) |
Taxes accrued | 158 | 148 |
Regulatory assets and liabilities | (56) | 5 |
Assets, other | (10) | (37) |
Liabilities, other | (46) | (4) |
Pension and other postretirement benefits | (6) | (5) |
Net cash provided by operating activities | 709 | 840 |
Cash Flows From Investing Activities: | ||
Capital expenditures | (778) | (751) |
Nuclear fuel expenditures | (61) | (26) |
Purchases of securities – nuclear decommissioning trust fund | (169) | (192) |
Sales and maturities of securities – nuclear decommissioning trust fund | 135 | 184 |
Purchase of bonds | 0 | (207) |
Proceeds from sale of remarketed bonds | 0 | 207 |
Money pool advances, net | 5 | 0 |
Other | 1 | 0 |
Net cash used in investing activities | (877) | (785) |
Cash Flows From Financing Activities: | ||
Dividends on common stock | 0 | (250) |
Dividends on preferred stock | (3) | (3) |
Short-term debt, net | (234) | 89 |
Maturities of long-term debt | (85) | (329) |
Issuances of long-term debt | 465 | 450 |
Debt issuance costs | (4) | (6) |
Net cash provided by financing activities | 139 | (49) |
Net change in cash, cash equivalents, and restricted cash | (29) | 6 |
Cash, cash equivalents, and restricted cash at beginning of year | 39 | 8 |
Cash, cash equivalents, and restricted cash at end of period | 10 | 14 |
Ameren Illinois Company | ||
Cash Flows From Operating Activities: | ||
Net income | 282 | 249 |
Adjustments to reconcile net income to net cash provided by operating activities: | ||
Depreciation and amortization | 322 | 303 |
Amortization of debt issuance costs and premium/discounts | 9 | 9 |
Deferred income taxes and investment tax credits, net | 72 | 42 |
Allowance for equity funds used during construction | (10) | (6) |
Other | 0 | 8 |
Changes in assets and liabilities: | ||
Receivables | (9) | 18 |
Inventories | (28) | (7) |
Accounts and wages payable | (12) | (48) |
Taxes accrued | (20) | 14 |
Regulatory assets and liabilities | 11 | 147 |
Assets, other | (52) | (15) |
Liabilities, other | (30) | 13 |
Pension and other postretirement benefits | (30) | (27) |
Net cash provided by operating activities | 515 | 706 |
Cash Flows From Investing Activities: | ||
Capital expenditures | (1,031) | (900) |
Other | 1 | (3) |
Net cash used in investing activities | (1,030) | (903) |
Cash Flows From Financing Activities: | ||
Dividends on preferred stock | (2) | (2) |
Short-term debt, net | 189 | 237 |
Capital contributions from parent | 350 | 0 |
Other | 0 | (1) |
Net cash provided by financing activities | 537 | 234 |
Net change in cash, cash equivalents, and restricted cash | 22 | 37 |
Cash, cash equivalents, and restricted cash at beginning of year | 125 | 80 |
Cash, cash equivalents, and restricted cash at end of period | $ 147 | $ 117 |
Consolidated Statement of Stock
Consolidated Statement of Stockholders' Equity - USD ($) $ in Millions | Total | Common Stock | Other Paid-in Capital | Retained Earnings | Deferred Retirement Benefit Costs | Accumulated Other Comprehensive Income (Loss) | Noncontrolling Interests | Total Ameren Corporation Shareholders' Equity | Union Electric Company | Union Electric CompanyCommon Stock | Union Electric CompanyOther Paid-in Capital | Union Electric CompanyPreferred Stock | Union Electric CompanyRetained Earnings | Ameren Illinois Company | Ameren Illinois CompanyCommon Stock | Ameren Illinois CompanyOther Paid-in Capital | Ameren Illinois CompanyPreferred Stock | Ameren Illinois CompanyRetained Earnings |
Beginning of period at Dec. 31, 2018 | $ 5,627 | $ 2,024 | $ (22) | $ 142 | $ 1,735 | $ 2,173 | $ 1,539 | |||||||||||
Shares issued under the DRPlus and 401(k) plan | 54 | |||||||||||||||||
Stock-based compensation activity | (8) | |||||||||||||||||
Capital contribution from parent | $ 0 | 0 | ||||||||||||||||
Net income | $ 739 | $ 449 | 449 | 249 | 249 | |||||||||||||
Net income attributable to Ameren common shareholders | 734 | 734 | ||||||||||||||||
Common stock dividends | (350) | (250) | ||||||||||||||||
Preferred stock dividends | (3) | (2) | ||||||||||||||||
Change in deferred retirement benefit costs | 1 | 1 | ||||||||||||||||
Net income attributable to noncontrolling interest holders | $ (5) | 5 | ||||||||||||||||
Dividends paid to noncontrolling interest holders | (5) | |||||||||||||||||
Common stock shares outstanding at beginning of year at Dec. 31, 2018 | 244,500,000 | |||||||||||||||||
Shares issued under the DRPlus and 401(k) plan | 700,000 | |||||||||||||||||
Shares issued for stock-based compensation | 800,000 | |||||||||||||||||
Common stock shares outstanding at end of period at Sep. 30, 2019 | 246,000,000 | |||||||||||||||||
End of period at Sep. 30, 2019 | $ 8,204 | $ 2 | 5,673 | 2,408 | (21) | $ (21) | 142 | $ 511 | $ 1,903 | $ 80 | 1,931 | $ 0 | 2,173 | $ 62 | 1,786 | |||
Dividends per common share (in dollars per share) | $ 1.4250 | |||||||||||||||||
Shareholders' equity, end of year at Sep. 30, 2019 | $ 8,062 | 4,425 | 4,021 | |||||||||||||||
Beginning of period at Jun. 30, 2019 | 5,649 | 2,161 | (21) | 142 | 1,781 | 2,173 | 1,721 | |||||||||||
Shares issued under the DRPlus and 401(k) plan | 17 | |||||||||||||||||
Stock-based compensation activity | 7 | |||||||||||||||||
Capital contribution from parent | 0 | |||||||||||||||||
Net income | $ 366 | 301 | 301 | 65 | 65 | |||||||||||||
Net income attributable to Ameren common shareholders | 364 | 364 | ||||||||||||||||
Common stock dividends | (117) | (150) | ||||||||||||||||
Preferred stock dividends | (1) | 0 | ||||||||||||||||
Change in deferred retirement benefit costs | 0 | 0 | ||||||||||||||||
Net income attributable to noncontrolling interest holders | $ (2) | 2 | ||||||||||||||||
Dividends paid to noncontrolling interest holders | (2) | |||||||||||||||||
Common stock shares outstanding at beginning of year at Jun. 30, 2019 | 245,800,000 | |||||||||||||||||
Shares issued under the DRPlus and 401(k) plan | 200,000 | |||||||||||||||||
Shares issued for stock-based compensation | 0 | |||||||||||||||||
Common stock shares outstanding at end of period at Sep. 30, 2019 | 246,000,000 | |||||||||||||||||
End of period at Sep. 30, 2019 | $ 8,204 | 2 | 5,673 | 2,408 | (21) | (21) | 142 | 511 | 1,903 | 80 | 1,931 | 0 | 2,173 | 62 | 1,786 | |||
Dividends per common share (in dollars per share) | $ 0.4750 | |||||||||||||||||
Shareholders' equity, end of year at Sep. 30, 2019 | 8,062 | 4,425 | 4,021 | |||||||||||||||
Beginning of period at Dec. 31, 2019 | $ 8,201 | 5,694 | 2,380 | (17) | 142 | 1,731 | 2,188 | 1,882 | ||||||||||
Shares issued under the DRPlus and 401(k) plan | 37 | |||||||||||||||||
Stock-based compensation activity | 2 | |||||||||||||||||
Capital contribution from parent | (350) | 350 | ||||||||||||||||
Net income | 761 | $ 442 | 442 | $ 282 | 282 | |||||||||||||
Net income attributable to Ameren common shareholders | 756 | 756 | ||||||||||||||||
Common stock dividends | (367) | 0 | ||||||||||||||||
Preferred stock dividends | (3) | (2) | ||||||||||||||||
Change in deferred retirement benefit costs | 2 | 2 | ||||||||||||||||
Net income attributable to noncontrolling interest holders | $ (5) | 5 | ||||||||||||||||
Dividends paid to noncontrolling interest holders | (5) | |||||||||||||||||
Common stock shares outstanding at beginning of year at Dec. 31, 2019 | 246,200,000 | 102,100,000 | 25,500,000 | |||||||||||||||
Shares issued under the DRPlus and 401(k) plan | 500,000 | |||||||||||||||||
Shares issued for stock-based compensation | 500,000 | |||||||||||||||||
Common stock shares outstanding at end of period at Sep. 30, 2020 | 247,200,000 | 102,100,000 | 25,500,000 | |||||||||||||||
End of period at Sep. 30, 2020 | $ 8,631 | 2 | 5,733 | 2,769 | (15) | (15) | 142 | 511 | 2,027 | 80 | 2,170 | 0 | 2,538 | 62 | 2,162 | |||
Dividends per common share (in dollars per share) | $ 1.4850 | |||||||||||||||||
Shareholders' equity, end of year at Sep. 30, 2020 | $ 8,489 | 8,489 | $ 4,788 | $ 4,762 | ||||||||||||||
Beginning of period at Jun. 30, 2020 | 5,716 | 2,525 | (16) | 142 | 1,873 | 2,538 | 2,085 | |||||||||||
Shares issued under the DRPlus and 401(k) plan | 10 | |||||||||||||||||
Stock-based compensation activity | 7 | |||||||||||||||||
Capital contribution from parent | 0 | |||||||||||||||||
Net income | 369 | $ 298 | 298 | $ 77 | 77 | |||||||||||||
Net income attributable to Ameren common shareholders | 367 | 367 | ||||||||||||||||
Common stock dividends | (123) | 0 | ||||||||||||||||
Preferred stock dividends | (1) | 0 | ||||||||||||||||
Change in deferred retirement benefit costs | 1 | 1 | ||||||||||||||||
Net income attributable to noncontrolling interest holders | $ (2) | 2 | ||||||||||||||||
Dividends paid to noncontrolling interest holders | (2) | |||||||||||||||||
Common stock shares outstanding at beginning of year at Jun. 30, 2020 | 247,100,000 | |||||||||||||||||
Shares issued under the DRPlus and 401(k) plan | 100,000 | |||||||||||||||||
Shares issued for stock-based compensation | 0 | |||||||||||||||||
Common stock shares outstanding at end of period at Sep. 30, 2020 | 247,200,000 | 102,100,000 | 25,500,000 | |||||||||||||||
End of period at Sep. 30, 2020 | $ 8,631 | $ 2 | $ 5,733 | $ 2,769 | $ (15) | $ (15) | $ 142 | $ 511 | $ 2,027 | $ 80 | $ 2,170 | $ 0 | $ 2,538 | $ 62 | $ 2,162 | |||
Dividends per common share (in dollars per share) | $ 0.4950 | |||||||||||||||||
Shareholders' equity, end of year at Sep. 30, 2020 | $ 8,489 | $ 8,489 | $ 4,788 | $ 4,762 |
Summary Of Significant Accounti
Summary Of Significant Accounting Policies | 9 Months Ended |
Sep. 30, 2020 | |
Accounting Policies [Abstract] | |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES | SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES General Ameren, headquartered in St. Louis, Missouri, is a public utility holding company whose primary assets are its equity interests in its subsidiaries. Ameren’s subsidiaries are separate, independent legal entities with separate businesses, assets, and liabilities. Dividends on Ameren’s common stock and the payment of expenses by Ameren depend on distributions made to it by its subsidiaries. Ameren’s principal subsidiaries are listed below. Ameren has other subsidiaries that conduct other activities, such as providing shared services. • Union Electric Company, doing business as Ameren Missouri, operates a rate-regulated electric generation, transmission, and distribution business and a rate-regulated natural gas distribution business in Missouri. • Ameren Illinois Company, doing business as Ameren Illinois, operates rate-regulated electric transmission, electric distribution, and natural gas distribution businesses in Illinois. • ATXI operates a FERC rate-regulated electric transmission business in the MISO. The COVID-19 pandemic continues to be a rapidly evolving situation. In the first nine months of 2020, we experienced a net decrease in our sales volumes, an increase in our accounts receivable balances that were past due or that were a part of a deferred payment arrangement, and a decline in our cash collections from customers. The continued effect of the COVID-19 pandemic on our results of operations, financial position, and liquidity in subsequent periods will depend on its severity and longevity, future regulatory or legislative actions with respect thereto, and the resulting impact on business, economic, and capital market conditions. Shelter-in-place orders began taking effect in our service territories in mid-March 2020. These orders generally required individuals to remain at home and precluded or limited the operation of businesses that were deemed nonessential. While our business operations were deemed essential and were not directly impacted by the shelter-in-place orders, approximately 65% of our workforce transitioned to remote working arrangements in mid-March 2020. In early June 2020, a small portion of our workforce began the process of returning to our work locations under a phased approach and approximately 50% of our workforce continues to work remotely. In mid-May 2020, shelter-in-place orders effective in our service territories began to be relaxed, with fewer restrictions on social activities and nonessential businesses beginning to reopen. However, certain restrictions remain in place that limit individual activities and the operation of nonessential businesses. Additional restrictions may be imposed in the future. We continue to assess the impacts the pandemic is having on our businesses, including but not limited to impacts on our liquidity; demand for residential, commercial, and industrial electric and natural gas services; more flexible payment plans for customers; the timing and extent to which recovery of incremental costs incurred, net of savings, and forgone customer late fee revenues at Ameren Missouri is allowed by the MoPSC; changes in our ability to disconnect customers for nonpayment; bad debt expense; supply chain operations; the availability of our employees and contractors; counterparty credit; capital construction; infrastructure operations and maintenance; energy-efficiency programs; and pension valuations. While the revenues from Ameren Illinois’ electric distribution business, residential and small nonresidential customers of Ameren Illinois’ natural gas distribution business, and Ameren Illinois’ and ATXI’s electric transmission businesses are decoupled from changes in sales volumes, earnings at Ameren Missouri and those associated with Ameren Illinois’ large nonresidential natural gas customers are exposed to such changes. Regarding uncollectible accounts receivable, Ameren Illinois’ electric distribution and natural gas distribution businesses have bad debt riders, which provide for recovery of bad debt write-offs, net of any subsequent recoveries. Pursuant to a June 2020 ICC order, Ameren Illinois’ electric bad debt rider provides for the recovery of bad debt expense in 2020. Ameren Missouri does not have a bad debt rider or regulatory tracking mechanism and its earnings are exposed to increases in bad debt expense. In October 2020, Ameren Missouri filed requests with the MoPSC for accounting authority orders related to costs incurred, net of savings, and forgone customer late fee revenues resulting from the COVID-19 pandemic. Our customers’ payment for our services has been adversely affected by the COVID-19 pandemic, resulting in a decrease to our cash flow from operations. As of September 30, 2020, accounts receivable balances that were 30 days or greater past due or that were a part of a deferred payment arrangement represented 26%, 18%, and 35%, or $151 million, $49 million, and $102 million, of Ameren’s, Ameren Missouri’s, and Ameren Illinois’ customer trade receivables before allowance for doubtful accounts, respectively. As of September 30, 2019, these percentages were 13%, 9%, and 18%, or $65 million, $23 million, and $42 million, for Ameren, Ameren Missouri, and Ameren Illinois, respectively. For information regarding Ameren Missouri’s and Ameren Illinois’ suspension and subsequent reinstatement of customer disconnections and late fee charges for nonpayment and Ameren Missouri’s requests for accounting authority orders related to the COVID-19 pandemic, see Note 2 – Rate and Regulatory Matters below. The Coronavirus Aid, Relief, and Economic Security Act is a federal law enacted in March 2020. Provisions in the act include temporary changes to the utilization of net operating losses, deferral of the payment of the employer portion of Social Security taxes, and additional funding for customer energy assistance, among other things. As of September 30, 2020, the implementation of the act by the Ameren Companies had no material impact to their financial statements. Ameren’s financial statements are prepared on a consolidated basis and therefore include the accounts of its majority-owned subsidiaries. All intercompany transactions have been eliminated, except as disclosed in Note 8 – Related-party Transactions. Ameren Missouri and Ameren Illinois have no subsidiaries. All tabular dollar amounts are in millions, unless otherwise indicated. Our accounting policies conform to GAAP. Our financial statements reflect all adjustments (which include normal, recurring adjustments) that are necessary, in our opinion, for a fair statement of our results. The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions. Such estimates and assumptions affect reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the dates of financial statements, and the reported amounts of revenues and expenses during the reported periods. Actual results could differ from those estimates. The results of operations of an interim period may not give a true indication of results that may be expected for a full year. These financial statements should be read in conjunction with the financial statements and accompanying notes included in the Form 10-K. Variable Interest Entities As of September 30, 2020, Ameren and Ameren Missouri had interests in unconsolidated variable interest entities that were established to construct wind generation facilities and, ultimately, sell those constructed facilities to Ameren Missouri. Neither Ameren nor Ameren Missouri are the primary beneficiary of these variable interest entities because neither has the power to direct matters that most significantly affect the entities' activities, which include designing, financing, and constructing the wind generation facilities. As a result, these variable interest entities have not been consolidated. As of September 30, 2020, the maximum exposure to loss related to these variable interest entities was approximately $18 million, which primarily represents due diligence and legal costs incurred by Ameren Missouri associated with the acquisitions. The risk of a loss was assessed to be remote and, accordingly, Ameren and Ameren Missouri have not recognized a liability associated with any portion of the maximum exposure to loss. See Note 2 – Rate and Regulatory Matters for additional information on the agreements to acquire these wind generation facilities. As of September 30, 2020, and December 31, 2019, Ameren had unconsolidated variable interests as a limited partner in various equity method investments, totaling $34 million and $28 million, respectively, included in “Other assets” on Ameren’s consolidated balance sheet. Ameren is not the primary beneficiary of these investments because it does not have the power to direct matters that most significantly affect the activities of these variable interest entities. As of September 30, 2020, the maximum exposure to loss related to these variable interests is limited to the investment in these partnerships of $34 million plus associated outstanding funding commitments of $37 million. Company-owned Life Insurance Ameren and Ameren Illinois have company-owned life insurance, which is recorded at the net cash surrender value. The net cash surrender value is the amount that can be realized under the insurance policies at the balance sheet date. As of September 30, 2020, the cash surrender value of company-owned life insurance at Ameren and Ameren Illinois was $260 million (December 31, 2019 – $264 million) and $114 million (December 31, 2019 – $123 million), respectively, while total borrowings against the policies were $107 million (December 31, 2019 – $114 million) at both Ameren and Ameren Illinois. Ameren and Ameren Illinois have the right to offset the borrowings against the cash surrender value of the policies and, consequently, present the net asset in “Other assets” on their respective balance sheets. Accounting and Reporting Developments See Note 1 – Summary of Significant Accounting Policies under Part II, Item 8, of the Form 10-K for additional information about authoritative accounting guidance relating to defined benefit plan disclosures that will be effective for the Ameren Companies in the fourth quarter of 2020. Measurement of Credit Losses on Financial Instruments On January 1, 2020, the Ameren Companies adopted authoritative accounting guidance that requires credit losses on most financial assets carried at amortized cost and off-balance sheet credit exposures, such as financial guarantees or loan commitments, to be measured using a current expected credit loss (CECL) model. The guidance requires an entity to measure expected credit losses using relevant information about past events, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount. In addition, the guidance made certain changes to the impairment model applicable to available-for-sale debt securities, such as requiring credit losses to be presented as an allowance rather than a write-down on impaired debt securities for which there is neither an intent nor a more-likely-than-not requirement to sell. Our adoption of this guidance did not have a material impact on the Ameren Companies’ |
Rate And Regulatory Matters
Rate And Regulatory Matters | 9 Months Ended |
Sep. 30, 2020 | |
Public Utilities, General Disclosures [Abstract] | |
RATE AND REGULATORY MATTERS | RATE AND REGULATORY MATTERS Below is a summary of updates to significant regulatory proceedings and related legal proceedings. See Note 2 – Rate and Regulatory Matters under Part II, Item 8, of the Form 10-K for additional information and a summary of our regulatory frameworks. We are unable to predict the ultimate outcome of these matters, the timing of the final decisions of the various agencies and courts, or the impact on our results of operations, financial position, or liquidity. Missouri March 2020 MoPSC Electric Rate Order In March 2020, the MoPSC issued an order in Ameren Missouri’s July 2019 electric service regulatory rate review, approving nonunanimous stipulation and agreements. The order resulted in a decrease of $32 million to Ameren Missouri's annual revenue requirement for electric retail service, which reflects infrastructure investments as of December 31, 2019. The order also provided for the continued use of the FAC and trackers for pension and postretirement benefits, uncertain income tax positions, and certain excess deferred income taxes that the MoPSC previously authorized in earlier electric rate orders. The order reduced the annualized base level of net energy costs pursuant to the FAC by approximately $115 million from the base level established in the MoPSC’s March 2017 electric rate order. The order also changed the annualized regulatory asset and liability amortization amounts and the base level of expenses for regulatory tracking mechanisms. On an annualized basis, these changes reflect approximately $20 million of increased revenues and approximate decreases in purchased power expenses of $15 million, other operating and maintenance expenses of $60 million, and income tax expenses of $20 million. Additionally, the annual revenue requirement incorporated increases of approximately $50 million for the reduction in sales volumes resulting from MEEIA programs and approximately $50 million of depreciation and amortization expense for amounts previously deferred under PISA. The increase in the annual revenue requirement related to the MEEIA programs is seasonally weighted to the summer. One of the stipulation and agreements approved by the MoPSC’s March 2020 order states that the net impact of the revenue and expense changes noted above reflects a 9.4% to 9.8% ROE on an unspecified percent of common equity applicable to rate base. In addition, the order required Ameren Missouri to donate $8 million to low-income assistance programs, which was reflected in results of operations in the first quarter of 2020. The new rates, base level of expenses, and amortizations became effective on April 1, 2020. In April 2020, the MoPSC issued another order in Ameren Missouri’s July 2019 electric service regulatory rate review, reaffirming the existing percentage of net energy cost variances allowed to be recovered or refunded under the FAC. Wind Generation Facilities In 2019, Ameren Missouri entered into a build-transfer agreement to acquire, after construction, an up-to 300-megawatt wind generation facility. In 2018, Ameren Missouri entered into a build-transfer agreement to acquire, after construction, an up-to 400-megawatt wind generation facility. These two agreements are subject to customary contract terms and conditions. The two build-transfer acquisitions collectively represent $1.2 billion of capital expenditures and would support Ameren Missouri’s compliance with the Missouri renewable energy standard. Both acquisitions have received all regulatory approvals, and both projects have received all applicable zoning approvals, have entered into RTO interconnection agreements, and are under construction. In 2020, the developers of the wind generation facilities received notices from the wind turbine supplier to each facility, and the developer of the up-to 300-megawatt project received a notice from the construction contractor, of changes in supply and/or construction activities resulting from the COVID-19 pandemic. There have been changes to the schedules for both projects, particularly with regard to wind turbine deliveries. During the third quarter of 2020, all remaining wind turbine deliveries for the up-to 400-megawatt project were completed. Based on the construction schedule, Ameren Missouri expects this project to be placed in-service by the end of 2020. At this time, due to manufacturing, shipping, and other supply chain issues in 2020, and, based on an updated construction schedule from the developer, Ameren Missouri expects the up-to 300-megawatt project to be partially placed in-service by the end of 2020, and the remaining portion of the project, representing approximately $200 million of investment, to be placed in-service in the first quarter of 2021. Ameren Missouri and the developer of the up-to 300-megawatt project continue to monitor the impact to this project's schedule. In May 2020, the IRS issued guidance that extended the in-service date criteria to December 31, 2021, for qualifying for federal production tax credits. As a result of this extension, Ameren does not anticipate that delays in the completion of the wind generation facilities will affect Ameren’s ability to realize anticipated federal production tax credits. MEEIA In August 2020, the MoPSC issued an order approving a unanimous stipulation and agreement with respect to the 2022 program year of Ameren Missouri’s six-year MEEIA 2019 program. The order established performance incentives that would provide Ameren Missouri an opportunity to earn additional revenues, including $11 million if Ameren Missouri achieves certain energy-efficiency goals during the 2022 program year and an additional $1 million if Ameren Missouri exceeds its targeted energy-efficiency goals. Ameren Missouri intends to invest $70 million in energy-efficiency programs during the 2022 program year. The August 2020 order also approved Ameren Missouri’s energy savings results for the first year of the MEEIA 2019 program. As a result of this order and in accordance with revenue recognition guidance, Ameren Missouri recognized revenues of $6 million in the third quarter of 2020. As a result of MoPSC orders issued in September 2017, October 2018, January 2019, and September 2019 related to performance incentives for the MEEIA 2013 and MEEIA 2016 programs, and in accordance with revenue recognition guidance, Ameren Missouri recognized revenues of $38 million during the first nine months of 2019. Requests for Accounting Authority Orders Related to COVID-19 Pandemic Costs Ameren Missouri suspended disconnections for customer nonpayment and charging late fees in mid-March 2020, and resumed those activities for commercial and industrial customers in mid-July 2020 and residential customers in early August 2020. In October 2020, Ameren Missouri filed requests with the MoPSC for accounting authority orders related to its electric and natural gas services. The orders would allow Ameren Missouri to accumulate certain costs incurred related to the COVID-19 pandemic and forgone customer late fee revenues from March 2020 to June 2021, for potential recovery in future electric and natural gas service regulatory rate reviews. These costs would be net of any cost savings Ameren Missouri realizes as a result of the COVID-19 pandemic. The orders would also allow Ameren Missouri to accumulate bad debt write-offs incurred from March 2020 to September 2021 due to the COVID-19 pandemic, for potential recovery in future electric and natural gas service regulatory rate reviews. The requests include an estimated $9 million of costs incurred, net of savings, and forgone customer late fee revenues related to the COVID-19 pandemic from March 2020 through September 2020. The requests did not seek accumulation for potential recovery of forgone revenues associated with decreased sales volumes related to the COVID-19 pandemic. The MoPSC is under no deadline to issue orders, and Ameren Missouri cannot predict the ultimate outcome of these regulatory proceedings. Illinois Electric Distribution Service Rates In April 2020, Ameren Illinois filed its annual electric distribution service formula rate update with the ICC, requesting a reduction of $45 million in its rates. This update reflects a decrease to the annual formula rate based on 2019 actual costs, a decrease to include the 2019 revenue requirement reconciliation adjustment, and a decrease for the conclusion of the 2018 revenue requirement reconciliation adjustment, which will be fully collected from customers in 2020, consistent with the ICC’s December 2019 annual update filing order. It also reflects an increase based on expected net plant additions for 2020. In September 2020, the ICC staff submitted its revised calculation of the revenue requirement included in Ameren Illinois’ update filing, recommending a $49 million decrease in Ameren Illinois’ electric distribution service rates. An ICC decision in this proceeding is expected by December 2020, with new rates effective January 2021. Electric Customer Energy-Efficiency Investments In May 2020, Ameren Illinois filed its annual electric customer energy-efficiency formula rate update to increase its rates by $7 million with the ICC. In August 2020, the ICC staff submitted a calculation of the revenue requirement included in Ameren Illinois’ filing, recommending an amount comparable to that included in Ameren Illinois’ filing. An ICC decision in this proceeding is expected by December 2020, with new rates effective January 2021. 2020 Natural Gas Delivery Service Regulatory Rate Review In February 2020, Ameren Illinois filed a request with the ICC seeking approval to increase its annual revenues for natural gas delivery service. In September 2020, Ameren Illinois filed a revised request seeking to increase its annual revenues for natural gas delivery service by $97 million, which includes an estimated $46 million of annual revenues that would otherwise be recovered under the QIP and other riders . The request is based on a 10.5% ROE, a capital structure composed of 54.1% common equity, and a rate base of $2.1 billion. Ameren Illinois used a 2021 future test year in this proceeding. In October 2020, the ICC staff recommended an increase to annual revenues for natural gas delivery service of $69 million, based on a 9.3% ROE, a capital structure composed of 50.4% common equity, and a rate base of $2.1 billion. A decision by the ICC in this proceeding is required by January 2021, with new rates expected to be effective in February 2021. Ameren Illinois cannot predict the level of any delivery service rate change the ICC may approve, nor whether any rate change that may eventually be approved will be sufficient to enable Ameren Illinois to earn a reasonable return on investments when the rate changes go into effect. QIP Reconciliation Hearing In March 2019, Ameren Illinois filed its annual request with the ICC for a reconciliation hearing to determine the accuracy and prudence of natural gas capital investments recovered under the QIP rider during 2018. In November 2019, the Illinois Attorney General's office challenged the recovery of capital investments, among other things, that were made during 2018, alleging that the amount of investments is excessive based on a comparison to historical investment levels. The Illinois Attorney General's office is not alleging project imprudence or that the investments do not qualify for recovery. In March 2020, the ICC staff filed testimony that supports the prudence and reasonableness of the capital investments made during 2018. Ameren Illinois’ 2018 QIP rate recovery request under review by the ICC is within the rate increase limitations allowed by law. The ICC is under no deadline to issue an order in this proceeding. Service Disconnection Moratorium Proceeding In March 2020, the ICC issued an order requiring all Illinois electric distribution and natural gas utilities to suspend disconnections and late fees for customer nonpayment, on an interim basis, effective March 18, 2020. Pursuant to an ICC order issued in June 2020 and a voluntary extension of the suspension of residential disconnections, Ameren Illinois resumed disconnection activities for commercial and industrial customers for nonpayment in early August 2020 and residential customers in mid-September 2020, with the exception of residential customers classified as low income, expressing a financial hardship, or relying on medical equipment. Disconnections for nonpayment for these residential customers are expected to begin in April 2021, which is after the annual winter moratorium period on disconnections from December 1, 2020 to March 31, 2021. Ameren Illinois also resumed charging late fees to all customers in late July 2020. The June 2020 order requires Ameren Illinois to implement more flexible credit and collection practices, on a temporary basis, including longer deferred payment arrangements, extending to 24 months in certain cases, and programs to provide financial assistance to customers. In addition, the order allows Ameren Illinois to recover up to $8 million in costs incurred related to the financial assistance programs. These costs will be deferred as regulatory assets and the portion associated with Ameren Illinois’ electric distribution business will be recovered through its bad debt rider and the portion associated with its natural gas distribution business will be recovered through a special purpose rider established by the order. The order also allows Ameren Illinois to recover forgone customer late fees and costs incurred related to the COVID-19 pandemic. The portion of these forgone late fees and costs associated with Ameren Illinois’ electric distribution business will be recovered through formula rates and the portion associated with its natural gas distribution business will be recovered through the special purpose rider. In addition, the order allows Ameren Illinois’ electric distribution business to recover bad debt expense, instead of write-offs net of subsequent recoveries, through its bad debt rider until the end of 2020. Federal Transmission Formula Rate Revisions In February 2020, the MISO, on behalf of Ameren Missouri, Ameren Illinois, and ATXI, filed requests with the FERC to revise each company’s transmission formula rate calculations with respect to calculation inputs for materials and supplies. In May 2020, the FERC issued orders approving the revisions prospectively. In addition, the FERC declined to order refunds for earlier periods, as requested by intervenors in Ameren Illinois’ filing, but directed its audit staff to review historical rate recovery in connection with an ongoing FERC audit. This review could lead the FERC to ultimately require refunds for periods prior to 2019. In June 2020, Ameren Missouri, Ameren Illinois, and ATXI filed requests for rehearing arguing, among other things, the revisions should be applied retrospectively to include the period January 1, 2019, to June 1, 2020, and that the FERC should not require refunds for periods prior to 2019. In July 2020, the FERC denied the rehearing requests without addressing the issues raised. In July 2020, Ameren Missouri, Ameren Illinois, and ATXI filed an appeal of the July 2020 rehearing denials to the United States Court of Appeals for the District of Columbia Circuit, which is under no deadline to address the appeal. In October 2020, the FERC issued an order reaffirming its May 2020 order and denying the arguments raised in the rehearing requests filed by Ameren Missouri, Ameren Illinois, and ATXI. Pursuant to the May 2020 order, in the second quarter of 2020, Ameren and Ameren Illinois recorded a $2 million reduction to revenue for the period of January 2019 through May 2020. Regardless of the outcome of the appeal, the impacts of the May 2020 and October 2020 orders are not expected to be material to Ameren’s, Ameren Missouri’s, or Ameren Illinois’ results of operations, financial position, or liquidity. FERC Complaint Cases In November 2013, a customer group filed a complaint case with the FERC seeking a reduction in the allowed base ROE for FERC-regulated transmission rate base under the MISO tariff from 12.38% to 9.15%. In September 2016, the FERC issued an order in the November 2013 complaint case, which lowered the allowed base ROE to 10.32%, or a 10.82% total allowed ROE with the inclusion of a 50 basis point incentive adder for participation in an RTO, that was effective from late September 2016 forward. The September 2016 order also required refunds for the period November 2013 to February 2015, which were paid in 2017. With the maximum FERC-allowed refund period for the November 2013 complaint case ending in February 2015, another customer complaint case was filed in February 2015, seeking a further reduction in the allowed base ROE for the period of February 2015 to May 2016. In November 2019, the FERC issued an order addressing the November 2013 complaint case, which set the allowed base ROE at 9.88%, superseding the 10.32% previously ordered, and required refunds, with interest, for the periods November 2013 to February 2015 and from late September 2016 forward. The order also dismissed the February 2015 complaint case. In December 2019, the MISO transmission owners, including Ameren Missouri, Ameren Illinois, and ATXI, filed requests for rehearing with the FERC. Additionally, in December 2019, various parties filed requests for rehearing with the FERC, challenging the dismissal of the February 2015 complaint case. In May 2020, the FERC issued an order addressing the requests for rehearing, which set the allowed base ROE at 10.02%, superseding the 9.88% previously ordered, and required refunds, with interest, for the periods November 2013 to February 2015 and from late September 2016 forward. The May 2020 order also denied rehearing of the FERC's dismissal of the February 2015 complaint case. In June 2020, various parties filed requests for rehearing with the FERC, challenging the new ROE methodology established by the May 2020 order. In July 2020, the FERC denied the rehearing requests without addressing the issues raised, and indicated it will address the requests for rehearing in a future order. Also in July 2020, Ameren Missouri, Ameren Illinois, and ATXI filed an appeal of the May 2020 order to the United States Court of Appeals for the District of Columbia Circuit challenging the refunds required for the period from September 2016 to May 2020. The court is under no deadline to address the appeal. As a result of the May 2020 order, which increased the FERC-allowed base ROE from 9.88% to 10.02% for the periods November 2013 to February 2015 and late September 2016 forward, Ameren and Ameren Illinois recognized income of $13 million and $7 million, respectively, during the second quarter of 2020. As of September 30, 2020, Ameren and Ameren Illinois had recorded current regulatory liabilities of $15 million and $7 million, respectively, to reflect the expected refunds, including interest, associated with the allowed base ROE set by the May 2020 order in the November 2013 complaint case. The increase in the FERC-allowed base ROE resulting from the May 2020 order is not material to Ameren Missouri’s results of operations, financial position, or liquidity. In March 2019, the FERC issued separate Notices of Inquiry regarding its allowed base ROE policy and its transmission incentives policy. The Notice of Inquiry addressing the FERC’s base ROE policy, among other things, broadened the ability to comment on the new methodology beyond electric utilities that are participants in the complaint cases. The transmission incentives Notice of Inquiry was open for comment on the FERC’s transmission incentive policy, including incentive adders to the base ROE. In March 2020, the FERC issued a Notice of Proposed Rulemaking on its transmission incentives policy, which addressed many of the issues in the Notice of Inquiry on transmission incentives. The Notice of Proposed Rulemaking included an increased incentive in the allowed base ROE for participation in an RTO to 100 basis points from the current 50 basis points and revised the parameters for awarding incentives, while limiting the overall incentives to a cap of 250 basis points, among other things. Initial comments were due by July 2020. While the FERC has not formally terminated the Notice of Inquiry regarding its transmission incentives policy, Ameren does not expect further actions relating to it. Ameren is unable to predict the ultimate impact of the Notice of Inquiry regarding its allowed base ROE policy or the Notice of Proposed Rulemaking at this time. |
Short-Term Debt And Liquidity
Short-Term Debt And Liquidity | 9 Months Ended |
Sep. 30, 2020 | |
Debt Disclosure [Abstract] | |
SHORT-TERM DEBT AND LIQUIDITY | SHORT-TERM DEBT AND LIQUIDITY The liquidity needs of the Ameren Companies are typically supported through the use of available cash, drawings under committed credit agreements, commercial paper issuances, and, in the case of Ameren Missouri and Ameren Illinois, short-term affiliate borrowings. See Note 4 – Short-term Debt and Liquidity under Part II, Item 8, in the Form 10-K for a description of our indebtedness provisions and other covenants as well as a description of money pool arrangements. Short-Term Borrowings The Missouri Credit Agreement and the Illinois Credit Agreement are available to support issuances under Ameren (parent)’s, Ameren Missouri’s, and Ameren Illinois’ commercial paper programs, respectively, subject to borrowing sublimits, and the issuance of letters of credit. As of September 30, 2020, based on commercial paper outstanding and letters of credit issued under the Credit Agreements, along with cash and cash equivalents, the net liquidity available to Ameren (parent), Ameren Missouri, and Ameren Illinois, collectively, was $2.0 billion. The Ameren Companies were in compliance with the covenants in their Credit Agreements as of September 30, 2020. As of September 30, 2020, the ratios of consolidated indebtedness to consolidated total capitalization, calculated in accordance with the provisions of the Credit Agreements, were 55%, 48%, and 45% for Ameren, Ameren Missouri, and Ameren Illinois, respectively. The following table presents commercial paper outstanding, net of issuance discounts, as of September 30, 2020, and December 31, 2019. There were no borrowings outstanding under the Credit Agreements as of September 30, 2020, or December 31, 2019. September 30, 2020 December 31, 2019 Ameren (parent) $ 30 $ 153 Ameren Missouri — 234 Ameren Illinois 242 53 Ameren consolidated $ 272 $ 440 The following table summarizes the activity and relevant interest rates for Ameren (parent)’s, Ameren Missouri’s, and Ameren Illinois’ commercial paper issuances and borrowings under the Credit Agreements in the aggregate for the nine months ended September 30, 2020 and 2019: Ameren Ameren Ameren Ameren 2020 Average daily amount outstanding $ 62 $ 142 $ 53 $ 257 Weighted-average interest rate 2.04 % 1.76 % 1.10 % 1.70 % Peak amount outstanding during period (a) $ 425 $ 573 $ 243 $ 908 Peak interest rate 3.30 % 5.05 % (b) 3.40 % 5.05 % (b) 2019 Average daily amount outstanding $ 532 $ 141 $ 147 $ 821 Weighted-average interest rate 2.70 % 2.73 % 2.58 % 2.68 % Peak amount outstanding during period (a) $ 651 $ 549 $ 310 $ 1,113 Peak interest rate 3.80 % 2.97 % 5.00 % (c) 5.00 % (c) (a) The timing of peak outstanding commercial paper issuances and borrowings under the Credit Agreements varies by company. Therefore, the sum of individual company peak amounts may not equal the Ameren consolidated peak for the period. (b) Ameren’s and Ameren Missouri’s peak interest rate was affected by temporary disruptions in the commercial paper market in the first quarter of 2020. (c) Ameren’s and Ameren Illinois’ peak interest rate was affected by temporary disruptions in the commercial paper market in the third quarter of 2019. Money Pools Ameren has money pool agreements with and among its subsidiaries to coordinate and provide for certain short-term cash and working capital requirements. The average interest rate for borrowings under the utility money pool for the three and nine months ended September 30, 2020, was 0.10% and 0.81%, respectively (2019 – 2.40% and 2.67%, respectively). See Note 8 – Related-party Transactions for the amount of interest income and expense from the utility money pool arrangements recorded by Ameren Missouri and Ameren Illinois for the three and nine months ended September 30, 2020 and 2019. |
Long-Term Debt And Equity Finan
Long-Term Debt And Equity Financings | 9 Months Ended |
Sep. 30, 2020 | |
Long-Term Debt And Equity Financings [Abstract] | |
LONG-TERM DEBT AND EQUITY FINANCINGS | LONG-TERM DEBT AND EQUITY FINANCINGS Ameren For the three and nine months ended September 30, 2020, Ameren issued a total of 0.1 million and 0.5 million shares of common stock, respectively, under its DRPlus and 401(k) plan, and received proceeds of $10 million and $37 million, respectively. In addition, in the first quarter of 2020, Ameren issued 0.5 million shares of common stock valued at $38 million upon the vesting of stock-based compensation. In August 2019, Ameren entered into a forward sale agreement with a counterparty relating to 7.5 million shares of common stock. The forward sale agreement will be physically settled unless Ameren elects to settle in cash or to net share settle. At September 30, 2020, Ameren could have settled the forward sale agreement with physical delivery of 7.5 million shares of common stock to the counterparty in exchange for $543 million. The forward sale agreement could also have been settled at September 30, 2020, with delivery of approximately $54 million or 0.7 million shares of common stock to the counterparty, if Ameren had elected to net cash or net share settle, respectively. For additional information about the forward sale agreement, see Note 5 – Long-Term Debt and Equity Financings under Part II, Item 8, in the Form 10-K. In April 2020, Ameren (parent) issued $800 million of 3.50% senior unsecured notes due January 2031, with interest payable semiannually on January 15 and July 15 of each year, beginning July 15, 2020. Ameren received net proceeds of $793 million, which were used for general corporate purposes, including to repay outstanding short-term debt, and were used to fund the repayment of Ameren’s $350 million of 2.70% senior unsecured notes, which were redeemed at par plus accrued interest in October 2020. In October 2020, Ameren, Ameren Missouri, and Ameren Illinois filed a Form S-3 shelf registration statement with the SEC, registering the issuance of an unspecified amount of certain types of securities. This registration statement became effective immediately upon filing and expires in October 2023. Ameren Missouri In March 2020, Ameren Missouri issued $465 million of 2.95% first mortgage bonds due March 2030, with interest payable semiannually on March 15 and September 15 of each year, beginning September 15, 2020. Ameren Missouri received net proceeds of $462 million, which were used to repay outstanding short-term debt, including short-term debt that Ameren Missouri incurred in connection with the repayment of $85 million of its 5.00% senior secured notes that matured in February 2020. In October 2020, Ameren Missouri issued $550 million of 2.625% first mortgage bonds due March 2051, with interest payable semiannually on March 15 and September 15 of each year, beginning March 15, 2021. The bonds were issued as green bonds; therefore, the proceeds will be used for eligible green projects. Ameren Missouri received net proceeds of $543 million, which are expected to be used to partially finance the acquisition of two wind generation facilities. See Note 2 – Rate and Regulatory Matters for information about the wind generation facilities. Ameren Illinois Ameren Illinois received cash capital contributions totaling $350 million from Ameren (parent) during the nine months ended September 30, 2020. Indenture Provisions and Other Covenants See Note 5 – Long-Term Debt and Equity Financings under Part II, Item 8, in the Form 10-K for a description of our indenture provisions and other covenants, as well as restrictions on the payment of dividends. At September 30, 2020, the Ameren Companies were in compliance with the provisions and covenants contained in their indentures and articles of incorporation, as applicable, and ATXI was in compliance with the provisions and covenants contained in its note purchase agreement. Off-balance-sheet Arrangements At September 30, 2020, none of the Ameren Companies had any significant off-balance-sheet financing arrangements, other than the forward sale agreement relating to common stock and variable interest entities. See Note 1 – Summary of Significant Accounting Policies for further detail concerning variable interest entities. |
Other Income and Expenses
Other Income and Expenses | 9 Months Ended |
Sep. 30, 2020 | |
Other Nonoperating Income (Expense) [Abstract] | |
OTHER INCOME AND EXPENSES | OTHER INCOME, NET The following table presents the components of “Other Income, Net” in the Ameren Companies’ statements of income for the three and nine months ended September 30, 2020 and 2019: Three Months Nine Months 2020 2019 2020 2019 Ameren: Allowance for equity funds used during construction $ 12 $ 7 $ 25 $ 20 Interest income on industrial development revenue bonds 7 6 19 19 Other interest income — 2 2 6 Non-service cost components of net periodic benefit income (a) 32 23 85 67 Miscellaneous income 1 2 10 6 Donations — (1) (14) (b) (8) Miscellaneous expense (4) (5) (10) (11) Total Other Income, Net $ 48 $ 34 $ 117 $ 99 Ameren Missouri: Allowance for equity funds used during construction $ 7 $ 6 $ 15 $ 14 Interest income on industrial development revenue bonds 7 6 19 19 Non-service cost components of net periodic benefit income (a) 13 4 32 13 Miscellaneous income 1 2 3 4 Donations — (1) (9) (b) (3) Miscellaneous expense (2) (2) (5) (4) Total Other Income, Net $ 26 $ 15 $ 55 $ 43 Ameren Illinois: Allowance for equity funds used during construction $ 5 $ 1 $ 10 $ 6 Interest income — 1 2 5 Non-service cost components of net periodic benefit income 12 12 36 36 Miscellaneous income 1 1 6 3 Donations — — (5) (5) Miscellaneous expense (1) (2) (4) (6) Total Other Income, Net $ 17 $ 13 $ 45 $ 39 (a) For the three and nine months ended September 30, 2020, the non-service cost components of net periodic benefit income were adjusted by amounts deferred of $(3) million and less than $(1) million, respectively, due to a regulatory tracking mechanism for the difference between the level of such costs incurred by Ameren Missouri under GAAP and the level of such costs included in rates. The deferral was $7 million and $22 million for three and nine months ended September 30, 2019, respectively. (b) Includes $8 million pursuant to Ameren Missouri’s March 2020 electric rate order. See Note 2 – Rate and Regulatory Matters for additional information. |
Derivative Financial Instrument
Derivative Financial Instruments | 9 Months Ended |
Sep. 30, 2020 | |
Derivative Instruments and Hedging Activities Disclosure [Abstract] | |
DERIVATIVE FINANCIAL INSTRUMENTS | DERIVATIVE FINANCIAL INSTRUMENTS We use derivatives to manage the risk of changes in market prices for natural gas, power and uranium, as well as the risk of changes in rail transportation surcharges through fuel oil hedges. Such price fluctuations may cause the following: • an unrealized appreciation or depreciation of our contracted commitments to purchase or sell when purchase or sale prices under the commitments are compared with current commodity prices; • market values of natural gas and uranium inventories that differ from the cost of those commodities in inventory; • actual cash outlays for the purchase of these commodities that differ from anticipated cash outlays; and • actual off-system sales revenues that differ from anticipated revenues The derivatives that we use to hedge these risks are governed by our risk management policies for forward contracts, futures, options, and swaps. Our net positions are continually assessed within our structured hedging programs to determine whether new or offsetting transactions are required. The goal of the hedging program is generally to mitigate financial risks while ensuring that sufficient volumes are available to meet our requirements. Contracts we enter into as part of our risk management program may be settled financially, settled by physical delivery, or net settled with the counterparty. All contracts considered to be derivative instruments are required to be recorded on the balance sheet at their fair values, unless the NPNS exception applies. Many of our physical contracts, such as our purchased power contracts, qualify for the NPNS exception to derivative accounting rules. The revenue or expense on NPNS contracts is recognized at the contract price upon physical delivery. The following disclosures exclude NPNS contracts and other non-derivative commodity contracts that are accounted for under the accrual method of accounting. If we determine that a contract meets the definition of a derivative and is not eligible for the NPNS exception, we review the contract to determine whether the resulting gains or losses qualify for regulatory deferral. Derivative contracts that qualify for regulatory deferral are recorded at fair value, with changes in fair value recorded as regulatory assets or liabilities in the period in which the change occurs. We believe derivative losses and gains deferred as regulatory assets and liabilities are probable of recovery, or refund, through future rates charged to customers. Regulatory assets and liabilities are amortized to operating income as related losses and gains are reflected in rates charged to customers. Therefore, gains and losses on these derivatives have no effect on operating income. As of September 30, 2020, and December 31, 2019, all contracts that met the definition of a derivative and were not eligible for the NPNS exception received regulatory deferral. Cash flows for all derivative financial instruments are classified in cash flows from operating activities. The following table presents open gross commodity contract volumes by commodity type for derivative assets and liabilities as of September 30, 2020, and December 31, 2019. As of September 30, 2020, these contracts extended through October 2023, October 2025, May 2032 and March 2023 for fuel oils, natural gas, power and uranium, respectively. Quantity (in millions, except as indicated) September 30, 2020 December 31, 2019 Commodity Ameren Missouri Ameren Illinois Ameren Ameren Missouri Ameren Illinois Ameren Fuel oils (in gallons) 44 — 44 58 — 58 Natural gas (in mmbtu) 32 123 155 20 136 156 Power (in megawatthours) 6 7 13 5 7 12 Uranium (pounds in thousands) 365 — 365 565 — 565 The following table presents the carrying value and balance sheet location of all derivative commodity contracts, none of which were designated as hedging instruments, as of September 30, 2020, and December 31, 2019: September 30, 2020 December 31, 2019 Balance Sheet Location Ameren Ameren Ameren Ameren Ameren Ameren Fuel oils Other current assets $ 2 $ — $ 2 $ 4 $ — $ 4 Other assets — — — 2 — 2 Natural gas Other current assets 2 10 12 — 3 3 Other assets 2 4 6 — 1 1 Power Other current assets 12 — 12 14 — 14 Other assets 1 — 1 2 — 2 Total assets $ 19 $ 14 $ 33 $ 22 $ 4 $ 26 Fuel oils Other current liabilities $ 14 $ — $ 14 $ 4 $ — $ 4 Other deferred credits and liabilities 6 — 6 3 — 3 Natural gas Other current liabilities — 2 2 1 12 13 Other deferred credits and liabilities — 1 1 1 6 7 Power Other current liabilities 6 16 22 2 17 19 Other deferred credits and liabilities 4 197 201 1 207 208 Uranium Other deferred credits and liabilities — — — 1 — 1 Total liabilities $ 30 $ 216 $ 246 $ 13 $ 242 $ 255 The Ameren Companies elect to present the fair value amounts of derivative assets and derivative liabilities subject to an enforceable master netting arrangement or similar agreement at the gross amounts on the balance sheet. However, if the gross amounts recognized on the balance sheet were netted with derivative instruments and cash collateral received or posted, the net amounts would not be materially different from the gross amounts at September 30, 2020, and December 31, 2019. Credit Risk In determining our concentrations of credit risk related to derivative instruments, we review our individual counterparties and categorize each counterparty into groupings according to the primary business in which each engages. As of September 30, 2020, if counterparty groups were to fail completely to perform on contracts, the Ameren Companies’ maximum exposure related to derivative assets would have been immaterial with or without consideration of the application of master netting arrangements or similar agreements and collateral held. Certain of our derivative instruments contain collateral provisions tied to the Ameren Companies’ credit ratings. If our credit ratings were downgraded below investment grade, or if a counterparty with reasonable grounds for uncertainty regarding our ability to satisfy an obligation requested adequate assurance of performance, additional collateral postings might be required. The additional collateral required is the net liability position allowed under master netting arrangements or similar agreements, assuming (1) the credit risk-related contingent features underlying these arrangements were triggered and (2) those counterparties with rights to do so requested collateral. As of September 30, 2020, the aggregate fair value of derivative instruments with credit risk-related contingent features in a gross liability position, the cash collateral posted, and the aggregate amount of additional collateral that counterparties could require were each immaterial to Ameren, Ameren Missouri, and Ameren Illinois. |
Fair Value Measurements
Fair Value Measurements | 9 Months Ended |
Sep. 30, 2020 | |
Fair Value Disclosures [Abstract] | |
Fair Value Disclosures | FAIR VALUE MEASUREMENTS Fair value is defined as the price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Fair value measurements are classified in three levels based on the fair value hierarchy as defined by GAAP. See Note 8 – Fair Value Measurements under Part II, Item 8, of the Form 10-K for information related to hierarchy levels and valuation techniques. We consider nonperformance risk in our valuation of derivative instruments by analyzing our own credit standing and the credit standing of our counterparties, and by considering any credit enhancements (e.g., collateral). Included in our valuation, and based on current market conditions, is a valuation adjustment for counterparty default derived from market data such as the price of credit default swaps, bond yields, and credit ratings. No material gains or losses related to valuation adjustments for counterparty default risk were recorded at Ameren, Ameren Missouri, or Ameren Illinois in the three and nine months ended September 30, 2020 or 2019. At September 30, 2020, and December 31, 2019, the counterparty default risk valuation adjustment related to derivative contracts was immaterial for Ameren, Ameren Missouri, and Ameren Illinois. The following table sets forth, by level within the fair value hierarchy, our assets and liabilities measured at fair value on a recurring basis as of September 30, 2020, and December 31, 2019: September 30, 2020 December 31, 2019 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets: Ameren Missouri Derivative assets – commodity contracts: Fuel oils $ — $ — $ 2 $ 2 $ — $ — $ 6 $ 6 Natural gas — 4 — 4 — — — — Power 1 — 12 13 — 2 14 16 Total derivative assets – commodity contracts $ 1 $ 4 $ 14 $ 19 $ — $ 2 $ 20 $ 22 Nuclear decommissioning trust fund: Equity securities: U.S. large capitalization $ 604 $ — $ — $ 604 $ 569 $ — $ — $ 569 Debt securities: U.S. Treasury and agency securities — 112 — 112 — 107 — 107 Corporate bonds — 116 — 116 — 93 — 93 Other — 66 — 66 — 73 — 73 Total nuclear decommissioning trust fund $ 604 $ 294 $ — $ 898 (a) $ 569 $ 273 $ — $ 842 (a) Total Ameren Missouri $ 605 $ 298 $ 14 $ 917 $ 569 $ 275 $ 20 $ 864 Ameren Illinois Derivative assets – commodity contracts: Natural gas $ — $ 9 $ 5 $ 14 $ — $ 1 $ 3 $ 4 Ameren Derivative assets – commodity contracts (b) $ 1 $ 13 $ 19 $ 33 $ — $ 3 $ 23 $ 26 Nuclear decommissioning trust fund (c) 604 294 — 898 (a) 569 273 — 842 (a) Total Ameren $ 605 $ 307 $ 19 $ 931 $ 569 $ 276 $ 23 $ 868 Liabilities: Ameren Missouri Derivative liabilities – commodity contracts: Fuel oils $ 13 $ — $ 7 $ 20 $ 1 $ — $ 6 $ 7 Natural gas — — — — — 2 — 2 Power 8 — 2 10 — 2 1 3 Uranium — — — — — — 1 1 Total Ameren Missouri $ 21 $ — $ 9 $ 30 $ 1 $ 4 $ 8 $ 13 Ameren Illinois Derivative liabilities – commodity contracts: Natural gas $ — $ 2 $ 1 $ 3 $ 3 $ 12 $ 3 $ 18 Power — — 213 213 — — 224 224 Total Ameren Illinois $ — $ 2 $ 214 $ 216 $ 3 $ 12 $ 227 $ 242 Ameren Derivative liabilities – commodity contracts (b) $ 21 $ 2 $ 223 $ 246 $ 4 $ 16 $ 235 $ 255 (a) Balance excludes $6 million and $5 million of cash and cash equivalents, receivables, payables, and accrued income, net, for September 30, 2020, and December 31, 2019, respectively. (b) See the Ameren Missouri and Ameren Illinois sections of the table for a breakout of the fair value of Ameren’s derivative assets and liabilities by type of commodity. (c) See the Ameren Missouri section of the table for a breakout of the fair value of Ameren's nuclear decommissioning trust fund by investment type. Level 3 fuel oils, natural gas, and uranium derivative contract assets and liabilities measured at fair value on a recurring basis were immaterial for all periods presented. The following table presents the fair value reconciliation of Level 3 power derivative contract assets and liabilities measured at fair value on a recurring basis for the three and nine months ended September 30, 2020 and 2019: 2020 2019 Ameren Ameren Ameren Ameren Missouri Ameren Illinois Ameren For the three months ended September 30: Beginning balance at July 1 $ 16 $ (229) $ (213) $ 15 $ (191) $ (176) Realized and unrealized gains/(losses) included in regulatory assets/liabilities (2) 12 10 (4) (17) (21) Settlements (4) 4 — (1) 4 3 Transfers out of Level 3 — — — (2) — (2) Ending balance at September 30 $ 10 $ (213) $ (203) $ 8 $ (204) $ (196) Change in unrealized gains/(losses) related to assets/liabilities held at September 30 $ (2) $ 11 $ 9 $ (4) $ (17) $ (21) For the nine months ended September 30: Beginning balance at January 1 $ 13 $ (224) $ (211) $ — $ (183) $ (183) Realized and unrealized gains/(losses) included in regulatory assets/liabilities 18 (2) 16 12 (32) (20) Settlements (21) 13 (8) (2) 11 9 Transfers out of Level 3 — — — (2) — (2) Ending balance at September 30 10 (213) (203) 8 (204) (196) Change in unrealized gains/(losses) related to assets/liabilities held at September 30 $ 6 $ (1) $ 5 $ 8 $ (31) $ (23) All gains or losses related to our Level 3 derivative commodity contracts are expected to be recovered or returned through customer rates; therefore, there is no impact to either net income or other comprehensive income resulting from changes in the fair value of these instruments. The following table describes the valuation techniques and significant unobservable inputs utilized for the fair value of our Level 3 power derivative contract assets and liabilities as of September 30, 2020, and December 31, 2019: Fair Value Weighted Average (b) Commodity Assets Liabilities Valuation Technique(s) Unobservable Input (a) Range 2020 Power (c) $ 12 $ (215) Discounted cash flow Average forward peak and off-peak pricing – forwards/swaps ($/MWh) 20 – 36 28 Nodal basis ($/MWh) (5) – 1 (2) Trend rate (%) 3 – 4 3 2019 Power (d) $ 14 $ (225) Discounted cash flow Average forward peak and off-peak pricing – forwards/swaps ($/MWh) 22 – 34 25 Nodal basis ($/MWh) (6) – 0 (2) Trend rate (%) (1) – 0 0 (a) Generally, significant increases (decreases) in these inputs in isolation would result in a significantly higher (lower) fair value measurement. (b) Unobservable inputs were weighted by relative fair value. (c) Valuations through 2029 use visible forward prices adjusted for nodal-to-hub basis differentials. Valuations beyond 2029 use a trend rate factor and are similarly adjusted for nodal-to-hub basis differentials. (d) Valuations through 2028 use visible forward prices adjusted for nodal-to-hub basis differentials. Valuations beyond 2028 use a trend rate factor and are similarly adjusted for nodal-to-hub basis differentials. The following table sets forth the carrying amount and, by level within the fair value hierarchy, the fair value of financial assets and liabilities disclosed, but not recorded, at fair value as of September 30, 2020, and December 31, 2019: Carrying Fair Value Level 1 Level 2 Level 3 Total September 30, 2020 Ameren: Cash, cash equivalents, and restricted cash $ 168 $ 168 $ — $ — $ 168 Investments in industrial development revenue bonds (a) 263 — 263 — 263 Short-term debt 272 — 272 — 272 Long-term debt (including current portion) (a) 10,529 (b) — 11,891 521 (c) 12,412 Ameren Missouri: Cash, cash equivalents, and restricted cash $ 10 $ 10 $ — $ — $ 10 Advances to money pool 5 — 5 — 5 Investments in industrial development revenue bonds (a) 263 — 263 — 263 Long-term debt (including current portion) (a) 4,568 (b) — 5,316 — 5,316 Ameren Illinois: Cash, cash equivalents, and restricted cash $ 147 $ 147 $ — $ — $ 147 Short-term debt 242 — 242 — 242 Long-term debt (including current portion) 3,576 (b) — 4,431 — 4,431 December 31, 2019 Ameren: Cash, cash equivalents, and restricted cash $ 176 $ 176 $ — $ — $ 176 Investments in industrial development revenue bonds (a) 263 — 263 — 263 Short-term debt 440 — 440 — 440 Long-term debt (including current portion) (a) 9,357 (b) — 9,957 484 (c) 10,441 Ameren Missouri: Cash, cash equivalents, and restricted cash $ 39 $ 39 $ — $ — $ 39 Investments in industrial development revenue bonds (a) 263 — 263 — 263 Short-term debt 234 — 234 — 234 Long-term debt (including current portion) (a) 4,190 (b) — 4,772 — 4,772 Ameren Illinois: Cash, cash equivalents, and restricted cash $ 125 $ 125 $ — $ — $ 125 Short-term debt 53 — 53 — 53 Long-term debt (including current portion) 3,575 (b) — 4,019 — 4,019 (a) Ameren and Ameren Missouri have investments in industrial development revenue bonds, classified as held-to-maturity and recorded in “Other Assets,” that are equal to the finance obligations for the Peno Creek and Audrain CT energy centers. As of September 30, 2020, and December 31, 2019, the carrying amount of both the investments in industrial development revenue bonds and the finance obligations approximated fair value. (b) Included unamortized debt issuance costs, which were excluded from the fair value measurement, of $77 million, $32 million, and $33 million for Ameren, Ameren Missouri, and Ameren Illinois, respectively, as of September 30, 2020. Included unamortized debt issuance costs, which were excluded from the fair value measurement, of $72 million, $30 million, and $34 million for Ameren, Ameren Missouri, and Ameren Illinois, respectively, as of December 31, 2019. (c) The Level 3 fair value amount consists of ATXI’s senior unsecured notes. |
Related Party Transactions
Related Party Transactions | 9 Months Ended |
Sep. 30, 2020 | |
Related Party Transactions [Abstract] | |
RELATED PARTY TRANSACTIONS | RELATED-PARTY TRANSACTIONS In the normal course of business, Ameren Missouri and Ameren Illinois have engaged in, and may in the future engage in, affiliate transactions. These transactions primarily consist of natural gas and power purchases and sales, services received or rendered, and borrowings and lendings. Transactions between Ameren’s subsidiaries are reported as affiliate transactions on their individual financial statements, but those transactions are eliminated in consolidation for Ameren’s consolidated financial statements, except as noted below. For a discussion of material related-party agreements and money pool arrangements, see Note 13 – Related-party Transactions and Note 4 – Short-term Debt and Liquidity under Part II, Item 8, of the Form 10-K. Electric Power and Capacity Supply Agreements In April and September 2020, Ameren Illinois conducted procurement events, administered by the IPA, to purchase energy products and acquire capacity. Ameren Missouri was among the winning suppliers in these events. As a result, in April 2020, Ameren Missouri contracted to supply a portion of Ameren Illinois’ capacity requirements for $2 million from June 2021 through May 2023. In September 2020, Ameren Missouri contracted to supply a portion of Ameren Illinois’ capacity requirements for $1 million from June 2021 through May 2023. Additionally, in September 2020, Ameren Missouri and Ameren Illinois entered into an energy product agreement by which Ameren Missouri agreed to sell, and Ameren Illinois agreed to purchase, 204,800 megawatthours at an average price of $31 per megawatthour during the period of September 2021 through November 2022. Tax Allocation Agreement See Note 1 – Summary of Significant Accounting Policies under Part II, Item 8, of the Form 10-K for a discussion of the tax allocation agreement. The following table presents the affiliate balances related to income taxes for Ameren Missouri and Ameren Illinois as of September 30, 2020, and December 31, 2019: September 30, 2020 December 31, 2019 Ameren Missouri Ameren Illinois Ameren Missouri Ameren Illinois Income taxes payable to parent (a) $ 38 $ 9 $ 15 $ 43 Income taxes receivable from parent (b) — 6 15 17 (a) Included in “Accounts payable – affiliates” on the balance sheet. (b) Included in “Accounts receivable – affiliates” on the balance sheet. Effects of Related-party Transactions on the Statement of Income The following table presents the effect on Ameren Missouri and Ameren Illinois of related-party transactions for the three and nine months ended September 30, 2020 and 2019: Three Months Nine Months Agreement Income Statement Ameren Ameren Ameren Ameren Ameren Missouri power supply Operating Revenues 2020 $ 5 $ (a) $ 11 $ (a) agreements with Ameren Illinois 2019 1 (a) 3 (a) Ameren Missouri and Ameren Illinois Operating Revenues 2020 $ 6 $ (b) $ 19 $ 1 rent and facility services 2019 7 1 20 2 Ameren Missouri and Ameren Illinois Operating Revenues 2020 $ (b) $ 1 $ 1 $ 1 miscellaneous support services 2019 1 (b) 1 1 Ameren Missouri software licensing Operating Revenues 2020 $ (a) $ (a) $ (a) $ (a) with Ameren Illinois (c) 2019 (a) 19 (a) 19 Total Operating Revenues 2020 $ 11 $ 1 $ 31 $ 2 2019 9 20 24 22 Ameren Illinois power supply Purchased Power 2020 $ (a) $ 5 $ (a) $ 11 agreements with Ameren Missouri 2019 (a) 1 (a) 3 Ameren Illinois transmission Purchased Power 2020 $ (a) $ (b) $ (a) $ 1 services with ATXI 2019 (a) 1 (a) 1 Total Purchased Power 2020 $ (a) $ 5 $ (a) $ 12 2019 (a) 2 (a) 4 Ameren Missouri and Ameren Illinois Other Operations and Maintenance 2020 $ (b) $ 1 $ (b) $ 3 rent and facility services 2019 (b) 1 1 4 Ameren Services support services Other Operations and Maintenance 2020 $ 36 $ 34 $ 103 $ 98 agreement 2019 34 30 98 91 Total Other Operations and 2020 $ 36 $ 35 $ 103 $ 101 Maintenance 2019 34 31 99 95 Money pool borrowings (advances) (Interest Charges)/Other Income, Net 2020 $ (b) $ (b) $ (b) $ (b) 2019 (b) (b) (b) (b) (a) Not applicable. (b) Amount less than $1 million. (c) In September 2019, Ameren Missouri purchased a license for advanced metering infrastructure software from Ameren Illinois. The amount of the $24 million cost-based transaction price over the $5 million remaining carrying value of the software was recorded as revenue by Ameren Illinois, with $14 million of revenue recorded at Ameren Illinois Electric Distribution and $5 million recorded at Ameren Illinois Natural Gas. The revenue recorded at Ameren Illinois Electric Distribution was reflected in formula ratemaking, which resulted in no impact to net income. Per authoritative accounting guidance for sales to rate-regulated entities, the revenue recognized by Ameren Illinois was not eliminated upon consolidation by Ameren. |
Commitments And Contingencies
Commitments And Contingencies | 9 Months Ended |
Sep. 30, 2020 | |
Commitments and Contingencies Disclosure [Abstract] | |
Commitments and Contingencies | COMMITMENTS AND CONTINGENCIESWe are involved in legal, tax, and regulatory proceedings before various courts, regulatory commissions, authorities, and governmental agencies with respect to matters that arise in the ordinary course of business, some of which involve substantial amounts of money. We believe that the final disposition of these proceedings, except as otherwise disclosed in the notes to our financial statements in this report and in the Form 10-K, will not have a material adverse effect on our results of operations, financial position, or liquidity. Reference is made to Note 1 – Summary of Significant Accounting Policies, Note 2 – Rate and Regulatory Matters, Note 10 – Callaway Energy Center, Note 13 – Related-party Transactions, and Note 14 – Commitments and Contingencies under Part II, Item 8, of the Form 10-K. See also Note 1 – Summary of Significant Accounting Policies, Note 2 – Rate and Regulatory Matters, Note 8 – Related-party Transactions, and Note 10 – Callaway Energy Center of this report. Other Obligations To supply a portion of the fuel requirements of Ameren Missouri’s energy centers, Ameren Missouri has entered into various long-term commitments for the procurement of coal, natural gas, nuclear fuel, and methane gas. Ameren Missouri and Ameren Illinois also have entered into various long-term commitments for purchased power and natural gas for distribution. The table below presents our estimated minimum fuel, purchased power, and other commitments at September 30, 2020. Ameren’s and Ameren Illinois’ purchased power commitments include the Ameren Illinois agreements entered into as part of the IPA-administered power procurement process. Included in the Other column are minimum purchase commitments under contracts for equipment, design and construction, and meter reading services, among other agreements, at September 30, 2020. Coal Natural Gas (a) Nuclear Purchased Power (b)(c) Methane Other Total Ameren: 2020 $ 94 $ 52 $ 3 $ 57 (d) $ — $ 39 $ 245 2021 242 161 57 156 (d) 3 53 672 2022 193 108 12 63 3 23 402 2023 113 69 45 21 3 23 274 2024 94 28 20 4 3 20 169 Thereafter 55 73 21 — 21 61 231 Total $ 791 $ 491 $ 158 $ 301 $ 33 $ 219 $ 1,993 Ameren Missouri: 2020 $ 94 $ 12 $ 3 $ — $ — $ 22 $ 131 2021 242 43 57 — 3 46 391 2022 193 38 12 — 3 23 269 2023 113 32 45 — 3 23 216 2024 94 13 20 — 3 20 150 Thereafter 55 22 21 — 21 24 143 Total $ 791 $ 160 $ 158 $ — $ 33 $ 158 $ 1,300 Ameren Illinois: 2020 $ — $ 40 $ — $ 57 (d) $ — $ 14 $ 111 2021 — 118 — 156 (d) — 2 276 2022 — 70 — 63 — — 133 2023 — 37 — 21 — — 58 2024 — 15 — 4 — — 19 Thereafter — 51 — — — — 51 Total $ — $ 331 $ — $ 301 $ — $ 16 $ 648 (a) Includes amounts for generation and for distribution. (b) The purchased power amounts for Ameren and Ameren Illinois exclude agreements for renewable energy credits through 2035 with various renewable energy suppliers due to the contingent nature of the payment amounts, with the exception of expected payments of $36 million through 2024. (c) The purchased power amounts for Ameren and Ameren Missouri exclude a 102-megawatt power purchase agreement with a wind farm operator, which expires in 2024, due to the contingent nature of the payment amounts. (d) In January 2018, as required by the FEJA, Ameren Illinois entered into agreements to acquire zero emission credits through 2026. Annual zero emission credit commitment amounts will be published by the IPA each May prior to the start of the subsequent planning year, which begins each June. The amounts above reflect Ameren Illinois’ commitment to acquire $42 million of zero emission credits through May 2021. Environmental Matters We are subject to various environmental laws, including statutes and regulations, enforced by federal, state, and local authorities. The development and operation of electric generation, transmission, and distribution facilities and natural gas storage, transmission, and distribution facilities can trigger compliance obligations with respect to environmental laws. These laws address emissions; discharges to surface and groundwater; water consumption; impacts to air, land, and water; and chemical and waste storage, handling and disposal. Complex and lengthy processes are required to obtain and renew approvals, permits, and licenses for new, existing or modified facilities. Additionally, the use and handling of various chemicals or hazardous materials require release prevention plans and emergency response procedures. Environmental regulations have a significant impact on the electric utility industry and our operations. Compliance with these regulations could be costly for Ameren Missouri, which operates coal-fired power plants. Regulations that apply to air emissions from the electric utility industry include the NSPS, the CSAPR, the MATS, and the National Ambient Air Quality Standards, which are subject to periodic review for certain pollutants. Collectively, these regulations cover a variety of pollutants, such as SO 2 , particulate matter, NO x , mercury, toxic metals, and acid gases, and CO 2 emissions from new power plants. Water intake and discharges from power plants are regulated under the Clean Water Act. Such regulations require evaluation of the environmental impacts of water intake structures and could require modifications to water intake structures or more stringent limitations on wastewater discharges at Ameren Missouri’s energy centers, either of which could result in significant capital expenditures. The management and disposal of coal ash is regulated as a solid waste under the Resource Conservation Recovery Act and a regulation known as the CCR rule, which will require the closure of our surface impoundments following the installations of dry ash handling systems at several of Ameren Missouri’s energy centers. The individual or combined effects of existing and new environmental regulations could result in significant capital expenditures, increased operating costs, or the closure or alteration of operations at some of Ameren Missouri’s energy centers. Ameren and Ameren Missouri expect that such compliance costs would be recoverable through rates, subject to MoPSC prudence review, but the timing of costs and their recovery could be subject to regulatory lag. Ameren and Ameren Missouri estimate that they will need to make capital expenditures of $200 million to $250 million from 2020 through 2024 in order to comply with existing environmental regulations. Additional environmental controls beyond 2024 could be required. This estimate of capital expenditures includes ash pond closure and corrective action costs required by the CCR regulations applicable to potential modifications to cooling water intake structures at existing power plants under Clean Water Act rules, and by effluent limitation guidelines applicable to steam electric generating units, all of which are discussed below. This estimate does not include capital expenditures that may be required as a result of the NSR and Clean Air Act litigation discussed below. Ameren Missouri’s current plan for compliance with existing air emission regulations includes burning low-sulfur coal and installing new or optimizing existing air pollution control equipment. The actual amount of capital expenditures required to comply with existing environmental regulations may vary substantially from the above estimate because of uncertainty as to future permitting requirements made by state regulators and the EPA, potential revisions to regulatory obligations, and the cost of potential compliance strategies, among other things. The following sections describe the more significant environmental laws and rules and environmental enforcement and remediation matters that affect or could affect our operations. The EPA has initiated an administrative review of several regulations and proposed amendments to regulations and guidelines, including to the effluent limitation guidelines and the CCR Rule, which could ultimately result in the revision of all or part of such rules. Clean Air Act Federal and state laws, including CSAPR, regulate emissions of SO 2 and NO x through the reduction of emissions at their source and the use and retirement of emission allowances. CSAPR is implemented through a series of phases, and the second phase became effective in 2017. Additional emission reduction requirements may apply in subsequent years. To achieve compliance with the CSAPR, Ameren Missouri burns low-sulfur coal, operates two scrubbers at its Sioux Energy Center, and optimizes other existing air pollution control equipment. Ameren Missouri expects to incur additional costs to lower its emissions at one or more of its energy centers to comply with the CSAPR in future years. These higher costs are expected to be recovered from customers through the FAC or higher base rates. CO 2 Emissions Standards The EPA’s Affordable Clean Energy Rule establishes emission guidelines for states to follow in developing plans to limit CO 2 emissions from coal-fired electric generating units. The EPA has identified certain efficiency measures as the best system of emission reduction for coal-fired electric generating units. The rule requires the state of Missouri to develop a compliance plan and submit it to the EPA for approval by July 2022. The plan is expected to include a standard of performance for each affected generating unit. We continue to evaluate the impact of the adoption and implementation of the Affordable Clean Energy Rule. Ameren Missouri and other stakeholders are working with the state of Missouri to develop the compliance plan submitted to the EPA. At this time, Ameren Missouri cannot predict the outcome of Missouri’s compliance plan development process. As such, the impact on the results of operations, financial position, and liquidity of Ameren and Ameren Missouri is uncertain. We also cannot predict the outcome of any potential legal challenges to the rule. NSR and Clean Air Litigation In January 2011, the Department of Justice, on behalf of the EPA, filed a complaint against Ameren Missouri in the United States District Court for the Eastern District of Missouri alleging that in performing projects at its coal-fired Rush Island Energy Center in 2007 and 2010, Ameren Missouri violated provisions of the Clean Air Act and Missouri law. In January 2017, the district court issued a liability ruling and, in September 2019, entered a final order that required Ameren Missouri to install a flue gas desulfurization system at the Rush Island Energy Center and a dry sorbent injection system at the Labadie Energy Center. There were no fines in the order. In October 2019, Ameren Missouri appealed the district court’s ruling to the United States Court of Appeals for the Eighth Circuit. The district court has stayed implementation of the majority of the requirements of its order while the case is under appeal. Ameren Missouri believes the district court both misinterpreted and misapplied the law in its ruling. Ameren Missouri is unable to predict the ultimate resolution of this matter. Briefing in this case has been completed, but the appellate court has not yet scheduled oral arguments. The appellate court is under no deadline to issue a ruling in this case. The ultimate resolution of this matter could have a material adverse effect on the results of operations, financial position, and liquidity of Ameren and Ameren Missouri. Among other things and subject to economic and regulatory considerations, resolution of this matter could result in increased capital expenditures for the installation of air pollution control equipment, as well as increased operations and maintenance expenses. Based upon engineering studies, capital expenditures to comply with the district court’s order for installation of a flue gas desulfurization system at the Rush Island Energy Center are estimated at approximately $1 billion. Further, the flue gas desulfurization system would result in additional operation and maintenance expenses of $30 million to $50 million annually for the life of the energy center. Engineering studies required to develop estimated capital expenditures and estimated additional operation and maintenance expenses for the Labadie Energy Center to comply with the district court’s order will not be undertaken while the case is under appeal. As a result of the district court’s stay, Ameren Missouri does not expect to make significant capital expenditures or incur operations and maintenance expenses related to the district court’s order while the case is under appeal. Clean Water Act The EPA’s Section 316(b) Rule requires power plant operators to evaluate cooling water intake structures and identify measures for reducing the number of aquatic organisms impinged on a power plant’s cooling water intake screens or entrained through the plant’s cooling water system. All of Ameren Missouri’s coal-fired and nuclear energy centers are subject to the cooling water intake structures rule. Requirements of the rule are being implemented through the permit renewal process of each energy center’s water discharge permit, which is expected to be completed by 2023. In 2015, the EPA issued a rule to revise the effluent limitation guidelines applicable to steam electric generating units. These guidelines established national standards for water discharges that are based on the effectiveness of available control technology and prohibits effluent discharges of certain waste streams and imposes more stringent limitations on certain water discharges from power plants. To meet the requirements of the guidelines, Ameren Missouri has completed or will complete construction in 2020 of wastewater treatment facilities and dry ash handling systems at three of its four coal-fired energy centers. The fourth coal-fired energy center is scheduled to close permanently in 2022. Estimated capital expenditures to complete these projects are included in the CCR management compliance plan, discussed below. CCR Management In 2015, the EPA issued the CCR rule, which established requirements for the management and disposal of CCR from coal-fired power plants. These regulations affect CCR disposal and handling costs at Ameren Missouri’s energy centers. Ameren Missouri is in the process of closing surface impoundments at three facilities, and is scheduled to complete the last of such closures at all of its energy centers in 2023. While the EPA has issued a series of revisions to the CCR rule, none of those revisions or proposals is expected to materially impact our closure schedule. Ameren and Ameren Missouri have AROs of $125 million recorded on their respective balance sheets as of September 30, 2020, associated with CCR storage facilities. Ameren Missouri estimates it will need to make capital expenditures of $75 million to $125 million from 2020 through 2024 to implement its CCR management compliance plan, which includes installation of dry ash handling systems, wastewater treatment facilities, and groundwater monitoring equipment. Remediation The Ameren Companies are involved in a number of remediation actions to clean up sites impacted by the use or disposal of materials containing hazardous substances. Federal and state laws can require responsible parties to fund remediation regardless of their degree of fault, the legality of original disposal, or the ownership of a disposal site. As of September 30, 2020, Ameren Illinois has remediated the majority of the 44 former MGP sites in Illinois it owned or for which it was otherwise responsible. Ameren Illinois estimates it could substantially conclude remediation efforts at the remaining sites by 2023. The ICC allows Ameren Illinois to recover such remediation and related litigation costs from its electric and natural gas utility customers through environmental cost riders. Costs are subject to annual prudence review by the ICC. As of September 30, 2020, Ameren Illinois estimated the remaining obligation related to these former MGP sites at $106 million to $178 million. Ameren and Ameren Illinois recorded a liability of $106 million to represent the estimated minimum obligation for these sites, as no other amount within the range was a better estimate. The scope of the remediation activities at these former MGP sites may increase as remediation efforts continue. Considerable uncertainty remains in these estimates because many site-specific factors can influence the ultimate actual costs, including unanticipated underground structures, the degree to which groundwater is encountered, regulatory changes, local ordinances, and site accessibility. The actual costs and timing of completion may vary substantially from these estimates. |
Callaway Energy Center
Callaway Energy Center | 9 Months Ended |
Sep. 30, 2020 | |
Nuclear Waste Matters [Abstract] | |
CALLAWAY ENERGY CENTER | CALLAWAY ENERGY CENTER See Note 9 – Callaway Energy Center under Part II, Item 8, of the Form 10-K for information regarding spent nuclear fuel recovery, recovery of decommissioning costs, and the nuclear decommissioning trust fund. The fair value of the trust fund for Ameren Missouri’s Callaway Energy Center is reported as “Nuclear decommissioning trust fund” in Ameren’s and Ameren Missouri’s balance sheets. This amount is legally restricted and may be used only to fund the costs of nuclear decommissioning. Changes in the fair value of the trust fund are recorded as an increase or decrease to the nuclear decommissioning trust fund, with an offsetting adjustment to the related regulatory liability. Ameren and Ameren Missouri have recorded an ARO for the Callaway Energy Center decommissioning costs at fair value, which represents the present value of estimated future cash outflows. Annual decommissioning costs of $7 million are included in the costs used to establish electric rates for Ameren Missouri’s customers. Every three years, the MoPSC requires Ameren Missouri to file an updated cost study and funding analysis for decommissioning its Callaway Energy Center. An updated cost study and funding analysis was filed with the MoPSC in November 2020 and reflected within the ARO. See Note 13 - Supplemental Information for more information on Ameren Missouri’s AROs. Insurance The following table presents insurance coverage at Ameren Missouri’s Callaway Energy Center at September 30, 2020: Type and Source of Coverage Most Recent Maximum Coverages Maximum Assessments Public liability and nuclear worker liability: American Nuclear Insurers January 1, 2020 $ 450 $ — Pool participation (a) 13,348 (a) 138 (b) $ 13,798 (c) $ 138 Property damage: NEIL and EMANI April 1, 2020 $ 3,200 (d) $ 25 (e) Replacement power: NEIL April 1, 2020 $ 490 (f) $ 7 (e) (a) Provided through mandatory participation in an industrywide retrospective premium assessment program. The maximum coverage available is dependent on the number of United States commercial reactors participating in the program. (b) Retrospective premium under the Price-Anderson Act. This is subject to retrospective assessment with respect to a covered loss in excess of $450 million in the event of an incident at any licensed United States commercial reactor, payable at $21 million per year. (c) Limit of liability for each incident under the Price-Anderson liability provisions of the Atomic Energy Act of 1954, as amended. This limit is subject to change to account for the effects of inflation and changes in the number of licensed power reactors. (d) NEIL provides $2.7 billion in property damage, stabilization, decontamination, and premature decommissioning insurance for radiation events and $2.3 billion in property damage insurance for nonradiation events. EMANI provides $490 million in property damage insurance for both radiation and nonradiation events. (e) All NEIL-insured plants could be subject to assessments should losses exceed the accumulated funds from NEIL. (f) Provides replacement power cost insurance in the event of a prolonged accidental outage. Weekly indemnity up to $4.5 million for 52 weeks, which commences after the first 12 weeks of an outage, plus up to $3.6 million per week for a minimum of 71 weeks thereafter for a total not exceeding the policy limit of $490 million. Nonradiation events are limited to $328 million. The Price-Anderson Act is a federal law that limits the liability for claims from an incident involving any licensed United States commercial nuclear energy center. The limit is based on the number of licensed reactors. The limit of liability and the maximum potential annual payments are adjusted at least every five years for inflation to reflect changes in the Consumer Price Index. The most recent five-year inflationary adjustment became effective in November 2018. Owners of a nuclear reactor cover this exposure through a combination of private insurance and mandatory participation in a financial protection pool, as established by the Price-Anderson Act. Losses resulting from terrorist attacks on nuclear facilities insured by NEIL are subject to industrywide aggregates, such that terrorist acts against one or more commercial nuclear power plants within a stated time period would be treated as a single event, and the owners of the nuclear power plants would share the limit of liability. NEIL policies have an aggregate limit of $3.2 billion within a 12-month period for radiation events, or $1.8 billion for events not involving radiation contamination, resulting from terrorist attacks. The EMANI policies are not subject to industrywide aggregates in the event of terrorist attacks on nuclear facilities. If losses from a nuclear incident at the Callaway Energy Center exceed the limits of, or are not covered by insurance, or if coverage is unavailable, Ameren Missouri is at risk for any uninsured losses. If a serious nuclear incident were to occur, it could have a material adverse effect on Ameren’s and Ameren Missouri’s results of operations, financial position, or liquidity. |
Retirement Benefits
Retirement Benefits | 9 Months Ended |
Sep. 30, 2020 | |
Retirement Benefits [Abstract] | |
RETIREMENT BENEFITS | RETIREMENT BENEFITS The following table presents the components of the net periodic benefit cost (income) incurred for Ameren’s pension and postretirement benefit plans for the three and nine months ended September 30, 2020 and 2019: Pension Benefits Postretirement Benefits Three Months Nine Months Three Months Nine Months 2020 2019 2020 2019 2020 2019 2020 2019 Service cost (a) $ 28 $ 22 $ 83 $ 66 $ 4 $ 4 $ 14 $ 13 Non-service cost components: Interest cost 43 46 130 139 10 11 29 32 Expected return on plan assets (73) (69) (218) (207) (20) (19) (60) (57) Amortization of: Prior service benefit — — (1) — (1) (1) (3) (4) Actuarial loss (gain) 15 6 45 19 (3) (4) (7) (11) Total non-service cost components (b) $ (15) $ (17) $ (44) $ (49) $ (14) $ (13) $ (41) $ (40) Net periodic benefit cost (income) $ 13 $ 5 $ 39 $ 17 $ (10) $ (9) $ (27) $ (27) (a) Service cost, net of capitalization, is reflected in “Operating Expenses – Other operations and maintenance” on Ameren’s statement of income. (b) Non-service cost components are reflected in “Other Income, Net” on Ameren’s statement of income. See Note 5 – Other Income, Net for additional information. Ameren Missouri and Ameren Illinois are responsible for their respective share of Ameren’s pension and other postretirement costs. The following table presents the respective share of net periodic pension and other postretirement benefit costs (income) incurred for the three and nine months ended September 30, 2020 and 2019: Pension Benefits Postretirement Benefits Three Months Nine Months Three Months Nine Months 2020 2019 2020 2019 2020 2019 2020 2019 Ameren Missouri (a) $ 5 $ 1 $ 16 $ 3 $ (2) $ (1) $ (4) $ (4) Ameren Illinois 8 5 24 15 (8) (8) (24) (23) Other — (1) (1) (1) — — 1 — Ameren (a) $ 13 $ 5 $ 39 $ 17 $ (10) $ (9) $ (27) $ (27) (a) Does not include the impact of the regulatory tracking mechanism for the difference between the level of pension and postretirement benefit costs incurred by Ameren Missouri under GAAP and the level of such costs included in rates. Funding Based on its assumptions at September 30, 2020, its investment performance in 2020, and its pension funding policy, the estimated aggregate contributions through 2024 has not materially changed from the $70 million expected aggregate contributions at December 31, 2019. |
Income Taxes
Income Taxes | 9 Months Ended |
Sep. 30, 2020 | |
Income Tax Disclosure [Abstract] | |
Income Taxes | INCOME TAXES The following table presents a reconciliation of the federal statutory corporate income tax rate to the effective income tax rate for the three and nine months ended September 30, 2020 and 2019: Ameren Ameren Missouri Ameren Illinois 2020 2019 2020 2019 2020 2019 Three Months Federal statutory corporate income tax rate: 21% 21% 21% 21% 21% 21% Increases (decreases) from: Amortization of deferred investment tax credit (1) (1) (1) (1) — — Amortization of excess deferred taxes (9) (a) (7) (16) (a) (11) (3) (3) Depreciation differences — — — — (1) — Renewable and other tax credits (1) — (2) — — — State tax 4 6 4 5 7 6 Stock-based compensation 1 1 — — — — Effective income tax rate 15% 20% 6% 14% 24% 24% Ameren Ameren Missouri Ameren Illinois 2020 2019 2020 2019 2020 2019 Nine Months Federal statutory corporate income tax rate: 21% 21% 21% 21% 21% 21% Increases (decreases) from: Amortization of deferred investment tax credit — (1) (1) (1) — — Amortization of excess deferred taxes (9) (a) (7) (16) (a) (12) (3) (4) Renewable and other tax credits (1) — (1) — — — State tax 5 6 3 5 7 7 Stock-based compensation (1) (1) — — — — Effective income tax rate 15% 18% 6% 13% 25% 24% (a) Increase in the amortization of excess deferred taxes pursuant to the MoPSC’s March 2020 electric rate order. See Note 2 – Rate and Regulatory Matters for additional information. |
Supplemental Information
Supplemental Information | 9 Months Ended |
Sep. 30, 2020 | |
Supplemental Information [Abstract] | |
Supplemental Information | SUPPLEMENTAL INFORMATION Cash, Cash Equivalents, and Restricted Cash The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets and the statements of cash flows as of September 30, 2020, and December 31, 2019: September 30, 2020 December 31, 2019 Ameren Ameren Ameren Ameren Ameren Ameren Cash and cash equivalents $ 6 $ — $ — $ 16 $ 9 $ — Restricted cash included in “Other current assets” 14 4 5 14 4 5 Restricted cash included in “Other assets” 142 — 142 120 — 120 Restricted cash included in “Nuclear decommissioning trust fund” 6 6 — 26 26 — Total cash, cash equivalents, and restricted cash $ 168 $ 10 $ 147 $ 176 $ 39 $ 125 Restricted cash included in “Other current assets” primarily represents funds held by an irrevocable Voluntary Employee Beneficiary Association (VEBA) trust, which provides health care benefits for active employees. Restricted cash included in “Other assets” on Ameren’s and Ameren Illinois’ balance sheets primarily represents amounts collected under a cost recovery rider restricted for use in the procurement of renewable energy credits and amounts in a trust fund restricted for the use of funding certain asbestos-related claims. Accounts Receivable “Accounts receivable – trade” on Ameren’s and Ameren Illinois’ balance sheets include certain receivables purchased at a discount from alternative retail electric suppliers that elect to participate in the utility consolidated billing program. At September 30, 2020, and December 31, 2019, “Other current liabilities” on Ameren’s and Ameren Illinois’ balance sheets included payables for purchased receivables of $36 million and $32 million, respectively. The following table provides a reconciliation of the beginning and ending amount of the allowance for doubtful accounts for the three and nine months ended September 30, 2020 and 2019: Three Months Nine Months 2020 2019 2020 2019 Ameren: Beginning of period $ 25 $ 19 $ 17 $ 18 Bad debt expense 21 14 31 22 Net write-offs (2) (14) (4) (21) End of period $ 44 $ 19 $ 44 $ 19 Ameren Missouri: Beginning of period $ 9 $ 7 $ 7 $ 7 Bad debt expense 5 3 9 6 Net write-offs — (2) (2) (5) End of period $ 14 $ 8 $ 14 $ 8 Ameren Illinois: (a) Beginning of Period $ 16 $ 12 $ 10 $ 11 Bad debt expense 16 11 22 16 Net write-offs (2) (12) (2) (16) End of Period $ 30 $ 11 $ 30 $ 11 (a) Ameren Illinois has rate-adjustment mechanisms that allow it to recover the difference between its actual net bad debt write-offs under GAAP, including those associated with receivables purchased from alternative retail electric suppliers, and the amount of net bad debt write-offs included in its base rates. In 2020, the rate-adjustment mechanism for electric distribution allows for recovery of bad debt expense recognized under GAAP. See Note 2 – Rate and Regulatory Matters for additional information. Net write-offs decreased for the three and nine months ended September 30, 2020, compared with the year-ago periods, due to the temporary suspension of disconnecting customers for nonpayment. See Note 2 – Rate and Regulatory Matters for additional information. Supplemental Cash Flow Information The following table provides noncash financing and investing activity excluded from the statements of cash flows for the nine months ended September 30, 2020 and 2019: September 30, 2020 September 30, 2019 Ameren Ameren Ameren Ameren Ameren Ameren Investing Exchange of bond investments for the extinguishment of senior unsecured notes $ — $ — $ — $ 17 $ — $ 17 Accrued capital expenditures 311 115 191 273 138 128 Net realized and unrealized gain (loss) – nuclear decommissioning trust fund 43 43 — 100 100 — Financing Exchange of bond investments for the extinguishment of senior unsecured notes $ — $ — $ — $ (17) $ — $ (17) Issuance of common stock for stock-based compensation 38 — — 54 — — Asset Retirement Obligations The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the nine months ended September 30, 2020: Ameren Ameren Ameren Balance at December 31, 2019 $ 687 $ 4 (a) $ 691 (b) Liabilities settled (42) — (42) Accretion 21 (c) 1 (c) 22 (c) Change in estimates 57 (d) — 57 (d) Balance at September 30, 2020 $ 723 $ 5 (a) $ 728 (b) (a) Included in “Other deferred credits and liabilities” on the balance sheet. (b) Balance included $53 million in “Other current liabilities” on the balance sheet as of both December 31, 2019, and September 30, 2020. (c) Accretion expense attributable to Ameren Missouri and Ameren Illinois was recorded as a decrease to regulatory liabilities and an increase to regulatory assets, respectively. (d) Ameren Missouri changed its fair value estimate primarily due to an update to the decommissioning of the Callaway Energy Center to reflect the cost study and funding analysis filed with the MoPSC in November 2020 and an increase in the cost estimate for closure of certain CCR storage facilities. Stock-based Compensation On January 1, 2020, Ameren granted 294,320 performance share units with a grant date fair value of $24 million and 132,307 restricted share units with a grant date fair value of $10 million. Awards vest approximately 38 months after the grant date or on a pro-rata basis upon death or eligible retirement. The performance share units vest based on the achievement of certain specified market performance measures (252,370 performance share units) or based on the achievement of renewable generation and energy storage installation targets (41,950 performance share units). The exact number of shares issued pursuant to a performance share unit varies from 0% to 200% of the target award, depending on actual company performance relative to the performance goals. On September 18, 2020, Ameren granted certain executive officers an additional 37,104 restricted share units with a grant date fair value of $3 million, which will vest after three years on September 17, 2023. The awards do not provide for pro rata vesting in connection with the executive officer's retirement. For the nine months ended September 30, 2020 and 2019, excess tax benefits associated with the settlement of stock-based compensation awards reduced income tax expense by $8 million and $14 million, respectively. Deferred Compensation As of September 30, 2020, and December 31, 2019, the present value of benefits to be paid for deferred compensation obligations was $88 million and $86 million, respectively, which was primarily reflected in “Other deferred credits and liabilities” on Ameren's consolidated balance sheet. Operating Revenues As of September 30, 2020 and 2019, our remaining performance obligations for contracts with a term greater than one year were immaterial. The Ameren Companies elected not to disclose the aggregate amount of the transaction price allocated to the performance obligations that are unsatisfied as of the end of the reporting period for contracts with an initial expected term of one year or less. See Note 14 – Segment Information for disaggregated revenue information. Excise Taxes Ameren Missouri and Ameren Illinois collect from their customers excise taxes, including municipal and state excise taxes and gross receipts taxes that are levied on the sale or distribution of natural gas and electricity. The following table presents the excise taxes recorded on a gross basis in “Operating Revenues – Electric,” “Operating Revenues – Natural gas” and “Operating Expenses – Taxes other than income taxes” on the statements of income for the three and nine months ended September 30, 2020 and 2019: Three Months Nine Months 2020 2019 2020 2019 Ameren Missouri $ 45 $ 49 $ 111 $ 118 Ameren Illinois 26 27 87 91 Ameren $ 71 $ 76 $ 198 $ 209 Earnings per Share The following table reconciles the basic weighted-average number of common shares outstanding to the diluted weighted-average number of common shares outstanding for the three and nine months ended September 30, 2020 and 2019: Three Months Nine Months 2020 2019 2020 2019 Weighted-average Common Shares Outstanding – Basic 247.1 245.9 246.8 245.5 Assumed settlement of performance share units and restricted stock units 1.5 1.4 1.2 1.4 Dilutive effect of forward sale agreement 0.6 0.2 0.4 0.1 Weighted-average Common Shares Outstanding – Diluted (a) 249.2 247.5 248.4 247.0 (a) There were no potentially dilutive securities excluded from the earnings per diluted share calculations for the three and nine months ended September 30, 2020 and 2019. |
Segment Information
Segment Information | 9 Months Ended |
Sep. 30, 2020 | |
Segment Reporting [Abstract] | |
SEGMENT INFORMATION | SEGMENT INFORMATION The following tables present revenues, net income (loss) attributable to common shareholders, and capital expenditures by segment at Ameren and Ameren Illinois for the three and nine months ended September 30, 2020 and 2019. Ameren, Ameren Missouri, and Ameren Illinois management review segment capital expenditure information rather than any individual or total asset amount. For additional information about our segments, see Note 16 – Segment Information under Part II, Item 8, of the Form 10-K. Ameren Ameren Missouri Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Transmission Other Intersegment Eliminations Ameren Three Months 2020: External revenues $ 990 $ 390 $ 122 $ 126 $ — $ — $ 1,628 Intersegment revenues 11 1 — 15 (a) — (27) — Net income (loss) attributable to Ameren common shareholders 297 34 2 62 (b) (28) — 367 Capital expenditures 262 129 81 185 2 (3) 656 Three Months 2019: External revenues $ 1,050 $ 374 $ 107 $ 109 $ — $ — $ 1,640 Intersegment revenues 9 15 5 19 (a) — (29) 19 (c) Net income (loss) attributable to Ameren common shareholders 300 32 (1) 53 (b) (20) — 364 Capital expenditures 256 139 113 129 (7) 6 636 Nine Months 2020: External revenues $ 2,442 $ 1,131 $ 533 $ 360 $ — $ — $ 4,466 Intersegment revenues 31 2 — 40 (a) — (73) — Net income (loss) attributable to Ameren common shareholders 439 107 66 168 (b) (24) — 756 Capital expenditures 778 391 221 490 4 — 1,884 Nine Months 2019: External revenues $ 2,591 $ 1,118 $ 563 $ 303 $ — $ — $ 4,575 Intersegment revenues 24 17 5 48 (a) — (75) 19 (c) Net income (loss) attributable to Ameren common shareholders 446 105 57 139 (b) (13) — 734 Capital expenditures 751 390 241 377 3 (1) 1,761 (a) Ameren Transmission earns revenue from transmission service provided to Ameren Illinois Electric Distribution. (b) Ameren Transmission earnings reflect an allocation of financing costs from Ameren (parent). (c) Intersegment revenues at Ameren include $14 million and $5 million of revenue from Ameren Illinois Electric Distribution and Ameren Illinois Natural Gas, respectively, for the three and nine months ended September 30, 2019, for a software licensing agreement with Ameren Missouri. Under authoritative accounting guidance for rate-regulated entities, the revenue recognized by Ameren Illinois was not eliminated upon consolidation. See Note 8 – Related-party Transactions under Part I, Item 1, of this report for additional information. Ameren Illinois Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Illinois Transmission Intersegment Eliminations Ameren Illinois Three Months 2020: External revenues $ 391 $ 122 $ 76 $ — $ 589 Intersegment revenues — — 15 (a) (15) — Net income available to common shareholder 34 2 41 — 77 Capital expenditures 129 81 160 — 370 Three Months 2019: External revenues $ 389 $ 112 $ 63 $ — $ 564 Intersegment revenues — — 18 (a) (18) — Net income (loss) available to common shareholder 32 (1) 34 — 65 Capital expenditures 139 113 92 — 344 Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Illinois Transmission Intersegment Eliminations Ameren Illinois Nine Months 2020: External revenues $ 1,133 $ 533 $ 213 $ — $ 1,879 Intersegment revenues — — 39 (a) (39) — Net income available to common shareholder 107 66 107 — 280 Capital expenditures 391 221 419 — 1,031 Nine Months 2019: External revenues $ 1,135 $ 568 $ 170 $ — $ 1,873 Intersegment revenues — — 47 (a) (47) — Net income available to common shareholder 105 57 85 — 247 Capital expenditures 390 241 269 — 900 (a) Ameren Illinois Transmission earns revenue from transmission service provided to Ameren Illinois Electric Distribution. The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the three and nine months ended September 30, 2020 and 2019. Economic factors affect the nature, timing, amount, and uncertainty of revenues and cash flows in a similar manner across customer classes. Revenues from alternative revenue programs have a similar distribution among customer classes as revenues from contracts with customers. Other revenues not associated with contracts with customers are presented in the Other customer classification, along with electric transmission and off-system revenues. Ameren Ameren Missouri Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Transmission Intersegment Eliminations Ameren Three Months 2020: Residential $ 455 $ 234 $ — $ — $ — $ 689 Commercial 343 127 — — — 470 Industrial 87 26 — — — 113 Other 99 4 — 141 (27) 217 Total electric revenues $ 984 $ 391 $ — $ 141 $ (27) $ 1,489 Residential $ 8 $ — $ 68 $ — $ — $ 76 Commercial 3 — 18 — — 21 Industrial 1 — 5 — — 6 Other 5 — 31 — — 36 Total gas revenues $ 17 $ — $ 122 $ — $ — $ 139 Total revenues (a) $ 1,001 $ 391 $ 122 $ 141 $ (27) $ 1,628 Three Months 2019: Residential $ 489 $ 224 $ — $ — $ — $ 713 Commercial 394 123 — — — 517 Industrial 94 27 — — — 121 Other 63 15 (b) — 128 (29) 177 Total electric revenues $ 1,040 $ 389 $ — $ 128 $ (29) $ 1,528 Residential $ 8 $ — $ 65 $ — $ — $ 73 Commercial 4 — 17 — — 21 Industrial 1 — 2 — — 3 Other 6 — 28 (b) — — 34 Total gas revenues $ 19 $ — $ 112 $ — $ — $ 131 Total revenues (a) $ 1,059 $ 389 $ 112 $ 128 $ (29) $ 1,659 Ameren Missouri Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Transmission Intersegment Eliminations Ameren Nine Months 2020: Residential $ 1,111 $ 664 $ — $ — $ — $ 1,775 Commercial 828 365 — — — 1,193 Industrial 207 91 — — — 298 Other 240 13 — 400 (73) 580 Total electric revenues $ 2,386 $ 1,133 $ — $ 400 $ (73) $ 3,846 Residential $ 52 $ — $ 375 $ — $ — $ 427 Commercial 20 — 94 — — 114 Industrial 3 — 11 — — 14 Other 12 — 53 — — 65 Total natural gas revenues $ 87 $ — $ 533 $ — $ — $ 620 Total revenues (a) $ 2,473 $ 1,133 $ 533 $ 400 $ (73) $ 4,466 Nine Months 2019: Residential $ 1,134 $ 640 $ — $ — $ — $ 1,774 Commercial 943 370 — — — 1,313 Industrial 226 94 — — — 320 Other 214 31 (b) — 351 (75) 521 Total electric revenues $ 2,517 $ 1,135 $ — $ 351 $ (75) $ 3,928 Residential $ 56 $ — $ 399 $ — $ — $ 455 Commercial 24 — 105 — — 129 Industrial 3 — 9 — — 12 Other 15 — 55 (b) — — 70 Total natural gas revenues $ 98 $ — $ 568 $ — $ — $ 666 Total revenues (a) $ 2,615 $ 1,135 $ 568 $ 351 $ (75) $ 4,594 (a) The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three and nine months ended September 30, 2020 and 2019: Ameren Missouri Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Transmission Ameren Three Months 2020: Revenues from alternative revenue programs $ 1 $ (110) $ 3 $ 4 $ (102) Other revenues not from contracts with customers 6 5 — — 11 Three Months 2019: Revenues from alternative revenue programs $ 26 $ (145) $ 1 $ (12) $ (130) Other revenues not from contracts with customers 5 1 1 — 7 Nine Months 2020: Revenues from alternative revenue programs $ (8) $ (59) $ 17 $ 34 $ (16) Other revenues not from contracts with customers 21 6 1 — 28 Nine Months 2019: Revenues from alternative revenue programs $ 41 $ (111) $ 2 $ (25) $ (93) Other revenues not from contracts with customers 14 5 2 — 21 (b) Includes $14 million and $5 million for Ameren Illinois Electric Distribution and Ameren Illinois Natural Gas, respectively, for the three and nine months ended September 30, 2019, for a software licensing agreement with Ameren Missouri. See Note 8 – Related-party Transactions for additional information. Ameren Illinois Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Illinois Transmission Intersegment Eliminations Ameren Illinois Three Months 2020: Residential $ 234 $ 68 $ — $ — $ 302 Commercial 127 18 — — 145 Industrial 26 5 — — 31 Other 4 31 91 (15) 111 Total revenues (a) $ 391 $ 122 $ 91 $ (15) $ 589 Three Months 2019: Residential $ 224 $ 65 $ — $ — $ 289 Commercial 123 17 — — 140 Industrial 27 2 — — 29 Other 15 (b) 28 (b) 81 (18) 106 Total revenues (a) $ 389 $ 112 $ 81 $ (18) $ 564 Nine Months 2020: Residential $ 664 $ 375 $ — $ — $ 1,039 Commercial 365 94 — — 459 Industrial 91 11 — — 102 Other 13 53 252 (39) 279 Total revenues (a) $ 1,133 $ 533 $ 252 $ (39) $ 1,879 Nine Months 2019: Residential $ 640 $ 399 $ — $ — $ 1,039 Commercial 370 105 — — 475 Industrial 94 9 — — 103 Other 31 (b) 55 (b) 217 (47) 256 Total revenues (a) $ 1,135 $ 568 $ 217 $ (47) $ 1,873 (a) The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the Ameren Illinois segments for the three and nine months ended September 30, 2020 and 2019: Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Illinois Transmission Ameren Illinois Three Months 2020: Revenues from alternative revenue programs $ (110) $ 3 $ 5 $ (102) Other revenues not from contracts with customers 5 — — 5 Three Months 2019: Revenues from alternative revenue programs $ (145) $ 1 $ (12) $ (156) Other revenues not from contracts with customers 1 1 — 2 Nine Months 2020: Revenues from alternative revenue programs $ (59) $ 17 $ 29 $ (13) Other revenues not from contracts with customers 6 1 — 7 Nine Months 2019: Revenues from alternative revenue programs $ (111) $ 2 $ (26) $ (135) Other revenues not from contracts with customers 5 2 — 7 (b) Includes $14 million and $5 million for Ameren Illinois Electric Distribution and Ameren Illinois Natural Gas, respectively, for the three and nine months ended September 30, 2019, for a software licensing agreement with Ameren Missouri. See Note 8 – Related-party Transactions for additional information. |
Summary Of Significant Accoun_2
Summary Of Significant Accounting Policies (Policies) | 9 Months Ended |
Sep. 30, 2020 | |
Accounting Policies [Abstract] | |
Nature of Operations | Ameren, headquartered in St. Louis, Missouri, is a public utility holding company whose primary assets are its equity interests in its subsidiaries. Ameren’s subsidiaries are separate, independent legal entities with separate businesses, assets, and liabilities. Dividends on Ameren’s common stock and the payment of expenses by Ameren depend on distributions made to it by its subsidiaries. Ameren’s principal subsidiaries are listed below. Ameren has other subsidiaries that conduct other activities, such as providing shared services. • Union Electric Company, doing business as Ameren Missouri, operates a rate-regulated electric generation, transmission, and distribution business and a rate-regulated natural gas distribution business in Missouri. • Ameren Illinois Company, doing business as Ameren Illinois, operates rate-regulated electric transmission, electric distribution, and natural gas distribution businesses in Illinois. • ATXI operates a FERC rate-regulated electric transmission business in the MISO. |
Consolidation | Ameren’s financial statements are prepared on a consolidated basis and therefore include the accounts of its majority-owned subsidiaries. All intercompany transactions have been eliminated, except as disclosed in Note 8 – Related-party Transactions. Ameren Missouri and Ameren Illinois have no subsidiaries. All tabular dollar amounts are in millions, unless otherwise indicated. Our accounting policies conform to GAAP. Our financial statements reflect all adjustments (which include normal, recurring adjustments) that are necessary, in our opinion, for a fair statement of our results. The preparation of financial statements in conformity with GAAP requires management to make certain estimates and assumptions. Such estimates and assumptions affect reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the dates of financial statements, and the reported amounts of revenues and expenses during the reported periods. Actual results could differ from those estimates. The results of operations of an interim period may not give a true indication of results that may be expected for a full year. These financial statements should be read in conjunction with the financial statements and accompanying notes included in the Form 10-K. |
Consolidation, Variable Interest Entity, Policy | Variable Interest Entities As of September 30, 2020, Ameren and Ameren Missouri had interests in unconsolidated variable interest entities that were established to construct wind generation facilities and, ultimately, sell those constructed facilities to Ameren Missouri. Neither Ameren nor Ameren Missouri are the primary beneficiary of these variable interest entities because neither has the power to direct matters that most significantly affect the entities' activities, which include designing, financing, and constructing the wind generation facilities. As a result, these variable interest entities have not been consolidated. As of September 30, 2020, the maximum exposure to loss related to these variable interest entities was approximately $18 million, which primarily represents due diligence and legal costs incurred by Ameren Missouri associated with the acquisitions. The risk of a loss was assessed to be remote and, accordingly, Ameren and Ameren Missouri have not recognized a liability associated with any portion of the maximum exposure to loss. See Note 2 – Rate and Regulatory Matters for additional information on the agreements to acquire these wind generation facilities. As of September 30, 2020, and December 31, 2019, Ameren had unconsolidated variable interests as a limited partner in various equity method investments, totaling $34 million and $28 million, respectively, included in “Other assets” on Ameren’s consolidated balance sheet. Ameren is not the primary beneficiary of these investments because it does not have the power to direct matters that most significantly affect the activities of these variable interest entities. As of September 30, 2020, the maximum exposure to loss related to these variable interests is limited to the investment in these partnerships of $34 million plus associated outstanding funding commitments of $37 million. |
Company-owned Life Insurance | Company-owned Life Insurance Ameren and Ameren Illinois have company-owned life insurance, which is recorded at the net cash surrender value. The net cash surrender value is the amount that can be realized under the insurance policies at the balance sheet date. As of September 30, 2020, the cash surrender value of company-owned life insurance at Ameren and Ameren Illinois was $260 million (December 31, 2019 – $264 million) and $114 million (December 31, 2019 – $123 million), respectively, while total borrowings against the policies were $107 million (December 31, 2019 – $114 million) at both Ameren and Ameren Illinois. Ameren and Ameren Illinois have the right to offset the borrowings against the cash surrender value of the policies and, consequently, present the net asset in “Other assets” on their respective balance sheets. |
Accounting and Reporting Developments | Accounting and Reporting Developments See Note 1 – Summary of Significant Accounting Policies under Part II, Item 8, of the Form 10-K for additional information about authoritative accounting guidance relating to defined benefit plan disclosures that will be effective for the Ameren Companies in the fourth quarter of 2020. Measurement of Credit Losses on Financial Instruments On January 1, 2020, the Ameren Companies adopted authoritative accounting guidance that requires credit losses on most financial assets carried at amortized cost and off-balance sheet credit exposures, such as financial guarantees or loan commitments, to be measured using a current expected credit loss (CECL) model. The guidance requires an entity to measure expected credit losses using relevant information about past events, current conditions, and reasonable and supportable forecasts that affect the collectibility of the reported amount. In addition, the guidance made certain changes to the impairment model applicable to available-for-sale debt securities, such as requiring credit losses to be presented as an allowance rather than a write-down on impaired debt securities for which there is neither an intent nor a more-likely-than-not requirement to sell. Our adoption of this guidance did not have a material impact on the Ameren Companies’ |
Derivatives, Policy | We use derivatives to manage the risk of changes in market prices for natural gas, power and uranium, as well as the risk of changes in rail transportation surcharges through fuel oil hedges. Such price fluctuations may cause the following: • an unrealized appreciation or depreciation of our contracted commitments to purchase or sell when purchase or sale prices under the commitments are compared with current commodity prices; • market values of natural gas and uranium inventories that differ from the cost of those commodities in inventory; • actual cash outlays for the purchase of these commodities that differ from anticipated cash outlays; and • actual off-system sales revenues that differ from anticipated revenues The derivatives that we use to hedge these risks are governed by our risk management policies for forward contracts, futures, options, and swaps. Our net positions are continually assessed within our structured hedging programs to determine whether new or offsetting transactions are required. The goal of the hedging program is generally to mitigate financial risks while ensuring that sufficient volumes are available to meet our requirements. Contracts we enter into as part of our risk management program may be settled financially, settled by physical delivery, or net settled with the counterparty. |
Deferred Compensation | Deferred Compensation As of September 30, 2020, and December 31, 2019, the present value of benefits to be paid for deferred compensation obligations was $88 million and $86 million, respectively, which was primarily reflected in “Other deferred credits and liabilities” on Ameren's consolidated balance sheet. |
Revenue from Contract with Customer | Operating Revenues As of September 30, 2020 and 2019, our remaining performance obligations for contracts with a term greater than one year were immaterial. The Ameren Companies elected not to disclose the aggregate amount of the transaction price allocated to the performance obligations that are unsatisfied as of the end of the reporting period for contracts with an initial expected term of one year or less. See Note 14 – Segment Information for disaggregated revenue information. |
Excise Taxes | Excise TaxesAmeren Missouri and Ameren Illinois collect from their customers excise taxes, including municipal and state excise taxes and gross receipts taxes that are levied on the sale or distribution of natural gas and electricity. |
Short-Term Debt and Liquidity (
Short-Term Debt and Liquidity (Tables) | 9 Months Ended |
Sep. 30, 2020 | |
Debt Disclosure [Abstract] | |
Schedule of Short-term Debt | The following table presents commercial paper outstanding, net of issuance discounts, as of September 30, 2020, and December 31, 2019. There were no borrowings outstanding under the Credit Agreements as of September 30, 2020, or December 31, 2019. September 30, 2020 December 31, 2019 Ameren (parent) $ 30 $ 153 Ameren Missouri — 234 Ameren Illinois 242 53 Ameren consolidated $ 272 $ 440 The following table summarizes the activity and relevant interest rates for Ameren (parent)’s, Ameren Missouri’s, and Ameren Illinois’ commercial paper issuances and borrowings under the Credit Agreements in the aggregate for the nine months ended September 30, 2020 and 2019: Ameren Ameren Ameren Ameren 2020 Average daily amount outstanding $ 62 $ 142 $ 53 $ 257 Weighted-average interest rate 2.04 % 1.76 % 1.10 % 1.70 % Peak amount outstanding during period (a) $ 425 $ 573 $ 243 $ 908 Peak interest rate 3.30 % 5.05 % (b) 3.40 % 5.05 % (b) 2019 Average daily amount outstanding $ 532 $ 141 $ 147 $ 821 Weighted-average interest rate 2.70 % 2.73 % 2.58 % 2.68 % Peak amount outstanding during period (a) $ 651 $ 549 $ 310 $ 1,113 Peak interest rate 3.80 % 2.97 % 5.00 % (c) 5.00 % (c) (a) The timing of peak outstanding commercial paper issuances and borrowings under the Credit Agreements varies by company. Therefore, the sum of individual company peak amounts may not equal the Ameren consolidated peak for the period. (b) Ameren’s and Ameren Missouri’s peak interest rate was affected by temporary disruptions in the commercial paper market in the first quarter of 2020. (c) Ameren’s and Ameren Illinois’ peak interest rate was affected by temporary disruptions in the commercial paper market in the third quarter of 2019. |
Other Income and Expenses (Tabl
Other Income and Expenses (Tables) | 9 Months Ended |
Sep. 30, 2020 | |
Other Nonoperating Income (Expense) [Abstract] | |
Other Income And Expenses | The following table presents the components of “Other Income, Net” in the Ameren Companies’ statements of income for the three and nine months ended September 30, 2020 and 2019: Three Months Nine Months 2020 2019 2020 2019 Ameren: Allowance for equity funds used during construction $ 12 $ 7 $ 25 $ 20 Interest income on industrial development revenue bonds 7 6 19 19 Other interest income — 2 2 6 Non-service cost components of net periodic benefit income (a) 32 23 85 67 Miscellaneous income 1 2 10 6 Donations — (1) (14) (b) (8) Miscellaneous expense (4) (5) (10) (11) Total Other Income, Net $ 48 $ 34 $ 117 $ 99 Ameren Missouri: Allowance for equity funds used during construction $ 7 $ 6 $ 15 $ 14 Interest income on industrial development revenue bonds 7 6 19 19 Non-service cost components of net periodic benefit income (a) 13 4 32 13 Miscellaneous income 1 2 3 4 Donations — (1) (9) (b) (3) Miscellaneous expense (2) (2) (5) (4) Total Other Income, Net $ 26 $ 15 $ 55 $ 43 Ameren Illinois: Allowance for equity funds used during construction $ 5 $ 1 $ 10 $ 6 Interest income — 1 2 5 Non-service cost components of net periodic benefit income 12 12 36 36 Miscellaneous income 1 1 6 3 Donations — — (5) (5) Miscellaneous expense (1) (2) (4) (6) Total Other Income, Net $ 17 $ 13 $ 45 $ 39 (a) For the three and nine months ended September 30, 2020, the non-service cost components of net periodic benefit income were adjusted by amounts deferred of $(3) million and less than $(1) million, respectively, due to a regulatory tracking mechanism for the difference between the level of such costs incurred by Ameren Missouri under GAAP and the level of such costs included in rates. The deferral was $7 million and $22 million for three and nine months ended September 30, 2019, respectively. (b) Includes $8 million pursuant to Ameren Missouri’s March 2020 electric rate order. See Note 2 – Rate and Regulatory Matters for additional information. |
Derivative Financial Instrume_2
Derivative Financial Instruments (Tables) | 9 Months Ended |
Sep. 30, 2020 | |
Derivative Instruments and Hedging Activities Disclosure [Abstract] | |
Open Gross Derivative Volumes By Commodity Type | The following table presents open gross commodity contract volumes by commodity type for derivative assets and liabilities as of September 30, 2020, and December 31, 2019. As of September 30, 2020, these contracts extended through October 2023, October 2025, May 2032 and March 2023 for fuel oils, natural gas, power and uranium, respectively. Quantity (in millions, except as indicated) September 30, 2020 December 31, 2019 Commodity Ameren Missouri Ameren Illinois Ameren Ameren Missouri Ameren Illinois Ameren Fuel oils (in gallons) 44 — 44 58 — 58 Natural gas (in mmbtu) 32 123 155 20 136 156 Power (in megawatthours) 6 7 13 5 7 12 Uranium (pounds in thousands) 365 — 365 565 — 565 |
Derivative Instruments Carrying Value | The following table presents the carrying value and balance sheet location of all derivative commodity contracts, none of which were designated as hedging instruments, as of September 30, 2020, and December 31, 2019: September 30, 2020 December 31, 2019 Balance Sheet Location Ameren Ameren Ameren Ameren Ameren Ameren Fuel oils Other current assets $ 2 $ — $ 2 $ 4 $ — $ 4 Other assets — — — 2 — 2 Natural gas Other current assets 2 10 12 — 3 3 Other assets 2 4 6 — 1 1 Power Other current assets 12 — 12 14 — 14 Other assets 1 — 1 2 — 2 Total assets $ 19 $ 14 $ 33 $ 22 $ 4 $ 26 Fuel oils Other current liabilities $ 14 $ — $ 14 $ 4 $ — $ 4 Other deferred credits and liabilities 6 — 6 3 — 3 Natural gas Other current liabilities — 2 2 1 12 13 Other deferred credits and liabilities — 1 1 1 6 7 Power Other current liabilities 6 16 22 2 17 19 Other deferred credits and liabilities 4 197 201 1 207 208 Uranium Other deferred credits and liabilities — — — 1 — 1 Total liabilities $ 30 $ 216 $ 246 $ 13 $ 242 $ 255 |
Fair Value Measurements (Tables
Fair Value Measurements (Tables) | 9 Months Ended |
Sep. 30, 2020 | |
Fair Value Disclosures [Abstract] | |
Schedule Of Fair Value Hierarchy Of Assets And Liabilities Measured At Fair Value On Recurring Basis | The following table sets forth, by level within the fair value hierarchy, our assets and liabilities measured at fair value on a recurring basis as of September 30, 2020, and December 31, 2019: September 30, 2020 December 31, 2019 Level 1 Level 2 Level 3 Total Level 1 Level 2 Level 3 Total Assets: Ameren Missouri Derivative assets – commodity contracts: Fuel oils $ — $ — $ 2 $ 2 $ — $ — $ 6 $ 6 Natural gas — 4 — 4 — — — — Power 1 — 12 13 — 2 14 16 Total derivative assets – commodity contracts $ 1 $ 4 $ 14 $ 19 $ — $ 2 $ 20 $ 22 Nuclear decommissioning trust fund: Equity securities: U.S. large capitalization $ 604 $ — $ — $ 604 $ 569 $ — $ — $ 569 Debt securities: U.S. Treasury and agency securities — 112 — 112 — 107 — 107 Corporate bonds — 116 — 116 — 93 — 93 Other — 66 — 66 — 73 — 73 Total nuclear decommissioning trust fund $ 604 $ 294 $ — $ 898 (a) $ 569 $ 273 $ — $ 842 (a) Total Ameren Missouri $ 605 $ 298 $ 14 $ 917 $ 569 $ 275 $ 20 $ 864 Ameren Illinois Derivative assets – commodity contracts: Natural gas $ — $ 9 $ 5 $ 14 $ — $ 1 $ 3 $ 4 Ameren Derivative assets – commodity contracts (b) $ 1 $ 13 $ 19 $ 33 $ — $ 3 $ 23 $ 26 Nuclear decommissioning trust fund (c) 604 294 — 898 (a) 569 273 — 842 (a) Total Ameren $ 605 $ 307 $ 19 $ 931 $ 569 $ 276 $ 23 $ 868 Liabilities: Ameren Missouri Derivative liabilities – commodity contracts: Fuel oils $ 13 $ — $ 7 $ 20 $ 1 $ — $ 6 $ 7 Natural gas — — — — — 2 — 2 Power 8 — 2 10 — 2 1 3 Uranium — — — — — — 1 1 Total Ameren Missouri $ 21 $ — $ 9 $ 30 $ 1 $ 4 $ 8 $ 13 Ameren Illinois Derivative liabilities – commodity contracts: Natural gas $ — $ 2 $ 1 $ 3 $ 3 $ 12 $ 3 $ 18 Power — — 213 213 — — 224 224 Total Ameren Illinois $ — $ 2 $ 214 $ 216 $ 3 $ 12 $ 227 $ 242 Ameren Derivative liabilities – commodity contracts (b) $ 21 $ 2 $ 223 $ 246 $ 4 $ 16 $ 235 $ 255 (a) Balance excludes $6 million and $5 million of cash and cash equivalents, receivables, payables, and accrued income, net, for September 30, 2020, and December 31, 2019, respectively. (b) See the Ameren Missouri and Ameren Illinois sections of the table for a breakout of the fair value of Ameren’s derivative assets and liabilities by type of commodity. (c) See the Ameren Missouri section of the table for a breakout of the fair value of Ameren's nuclear decommissioning trust fund by investment type. |
Schedule Of Changes In The Fair Value Of Financial Assets And Liabilities Classified As Level Three In The Fair Value Hierarchy | The following table presents the fair value reconciliation of Level 3 power derivative contract assets and liabilities measured at fair value on a recurring basis for the three and nine months ended September 30, 2020 and 2019: 2020 2019 Ameren Ameren Ameren Ameren Missouri Ameren Illinois Ameren For the three months ended September 30: Beginning balance at July 1 $ 16 $ (229) $ (213) $ 15 $ (191) $ (176) Realized and unrealized gains/(losses) included in regulatory assets/liabilities (2) 12 10 (4) (17) (21) Settlements (4) 4 — (1) 4 3 Transfers out of Level 3 — — — (2) — (2) Ending balance at September 30 $ 10 $ (213) $ (203) $ 8 $ (204) $ (196) Change in unrealized gains/(losses) related to assets/liabilities held at September 30 $ (2) $ 11 $ 9 $ (4) $ (17) $ (21) For the nine months ended September 30: Beginning balance at January 1 $ 13 $ (224) $ (211) $ — $ (183) $ (183) Realized and unrealized gains/(losses) included in regulatory assets/liabilities 18 (2) 16 12 (32) (20) Settlements (21) 13 (8) (2) 11 9 Transfers out of Level 3 — — — (2) — (2) Ending balance at September 30 10 (213) (203) 8 (204) (196) Change in unrealized gains/(losses) related to assets/liabilities held at September 30 $ 6 $ (1) $ 5 $ 8 $ (31) $ (23) |
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis, Valuation Techniques | The following table describes the valuation techniques and significant unobservable inputs utilized for the fair value of our Level 3 power derivative contract assets and liabilities as of September 30, 2020, and December 31, 2019: Fair Value Weighted Average (b) Commodity Assets Liabilities Valuation Technique(s) Unobservable Input (a) Range 2020 Power (c) $ 12 $ (215) Discounted cash flow Average forward peak and off-peak pricing – forwards/swaps ($/MWh) 20 – 36 28 Nodal basis ($/MWh) (5) – 1 (2) Trend rate (%) 3 – 4 3 2019 Power (d) $ 14 $ (225) Discounted cash flow Average forward peak and off-peak pricing – forwards/swaps ($/MWh) 22 – 34 25 Nodal basis ($/MWh) (6) – 0 (2) Trend rate (%) (1) – 0 0 (a) Generally, significant increases (decreases) in these inputs in isolation would result in a significantly higher (lower) fair value measurement. (b) Unobservable inputs were weighted by relative fair value. (c) Valuations through 2029 use visible forward prices adjusted for nodal-to-hub basis differentials. Valuations beyond 2029 use a trend rate factor and are similarly adjusted for nodal-to-hub basis differentials. (d) Valuations through 2028 use visible forward prices adjusted for nodal-to-hub basis differentials. Valuations beyond 2028 use a trend rate factor and are similarly adjusted for nodal-to-hub basis differentials. |
Schedule of Financial Assets and Liabilities | The following table sets forth the carrying amount and, by level within the fair value hierarchy, the fair value of financial assets and liabilities disclosed, but not recorded, at fair value as of September 30, 2020, and December 31, 2019: Carrying Fair Value Level 1 Level 2 Level 3 Total September 30, 2020 Ameren: Cash, cash equivalents, and restricted cash $ 168 $ 168 $ — $ — $ 168 Investments in industrial development revenue bonds (a) 263 — 263 — 263 Short-term debt 272 — 272 — 272 Long-term debt (including current portion) (a) 10,529 (b) — 11,891 521 (c) 12,412 Ameren Missouri: Cash, cash equivalents, and restricted cash $ 10 $ 10 $ — $ — $ 10 Advances to money pool 5 — 5 — 5 Investments in industrial development revenue bonds (a) 263 — 263 — 263 Long-term debt (including current portion) (a) 4,568 (b) — 5,316 — 5,316 Ameren Illinois: Cash, cash equivalents, and restricted cash $ 147 $ 147 $ — $ — $ 147 Short-term debt 242 — 242 — 242 Long-term debt (including current portion) 3,576 (b) — 4,431 — 4,431 December 31, 2019 Ameren: Cash, cash equivalents, and restricted cash $ 176 $ 176 $ — $ — $ 176 Investments in industrial development revenue bonds (a) 263 — 263 — 263 Short-term debt 440 — 440 — 440 Long-term debt (including current portion) (a) 9,357 (b) — 9,957 484 (c) 10,441 Ameren Missouri: Cash, cash equivalents, and restricted cash $ 39 $ 39 $ — $ — $ 39 Investments in industrial development revenue bonds (a) 263 — 263 — 263 Short-term debt 234 — 234 — 234 Long-term debt (including current portion) (a) 4,190 (b) — 4,772 — 4,772 Ameren Illinois: Cash, cash equivalents, and restricted cash $ 125 $ 125 $ — $ — $ 125 Short-term debt 53 — 53 — 53 Long-term debt (including current portion) 3,575 (b) — 4,019 — 4,019 (a) Ameren and Ameren Missouri have investments in industrial development revenue bonds, classified as held-to-maturity and recorded in “Other Assets,” that are equal to the finance obligations for the Peno Creek and Audrain CT energy centers. As of September 30, 2020, and December 31, 2019, the carrying amount of both the investments in industrial development revenue bonds and the finance obligations approximated fair value. (b) Included unamortized debt issuance costs, which were excluded from the fair value measurement, of $77 million, $32 million, and $33 million for Ameren, Ameren Missouri, and Ameren Illinois, respectively, as of September 30, 2020. Included unamortized debt issuance costs, which were excluded from the fair value measurement, of $72 million, $30 million, and $34 million for Ameren, Ameren Missouri, and Ameren Illinois, respectively, as of December 31, 2019. (c) The Level 3 fair value amount consists of ATXI’s senior unsecured notes. |
Related Party Transactions (Tab
Related Party Transactions (Tables) | 9 Months Ended |
Sep. 30, 2020 | |
Related Party Transactions [Abstract] | |
Schedule of Affiliate Receivables and Payables | The following table presents the affiliate balances related to income taxes for Ameren Missouri and Ameren Illinois as of September 30, 2020, and December 31, 2019: September 30, 2020 December 31, 2019 Ameren Missouri Ameren Illinois Ameren Missouri Ameren Illinois Income taxes payable to parent (a) $ 38 $ 9 $ 15 $ 43 Income taxes receivable from parent (b) — 6 15 17 (a) Included in “Accounts payable – affiliates” on the balance sheet. (b) Included in “Accounts receivable – affiliates” on the balance sheet. |
Schedule of Related Party Transactions | The following table presents the effect on Ameren Missouri and Ameren Illinois of related-party transactions for the three and nine months ended September 30, 2020 and 2019: Three Months Nine Months Agreement Income Statement Ameren Ameren Ameren Ameren Ameren Missouri power supply Operating Revenues 2020 $ 5 $ (a) $ 11 $ (a) agreements with Ameren Illinois 2019 1 (a) 3 (a) Ameren Missouri and Ameren Illinois Operating Revenues 2020 $ 6 $ (b) $ 19 $ 1 rent and facility services 2019 7 1 20 2 Ameren Missouri and Ameren Illinois Operating Revenues 2020 $ (b) $ 1 $ 1 $ 1 miscellaneous support services 2019 1 (b) 1 1 Ameren Missouri software licensing Operating Revenues 2020 $ (a) $ (a) $ (a) $ (a) with Ameren Illinois (c) 2019 (a) 19 (a) 19 Total Operating Revenues 2020 $ 11 $ 1 $ 31 $ 2 2019 9 20 24 22 Ameren Illinois power supply Purchased Power 2020 $ (a) $ 5 $ (a) $ 11 agreements with Ameren Missouri 2019 (a) 1 (a) 3 Ameren Illinois transmission Purchased Power 2020 $ (a) $ (b) $ (a) $ 1 services with ATXI 2019 (a) 1 (a) 1 Total Purchased Power 2020 $ (a) $ 5 $ (a) $ 12 2019 (a) 2 (a) 4 Ameren Missouri and Ameren Illinois Other Operations and Maintenance 2020 $ (b) $ 1 $ (b) $ 3 rent and facility services 2019 (b) 1 1 4 Ameren Services support services Other Operations and Maintenance 2020 $ 36 $ 34 $ 103 $ 98 agreement 2019 34 30 98 91 Total Other Operations and 2020 $ 36 $ 35 $ 103 $ 101 Maintenance 2019 34 31 99 95 Money pool borrowings (advances) (Interest Charges)/Other Income, Net 2020 $ (b) $ (b) $ (b) $ (b) 2019 (b) (b) (b) (b) (a) Not applicable. (b) Amount less than $1 million. (c) In September 2019, Ameren Missouri purchased a license for advanced metering infrastructure software from Ameren Illinois. The amount of the $24 million cost-based transaction price over the $5 million remaining carrying value of the software was recorded as revenue by Ameren Illinois, with $14 million of revenue recorded at Ameren Illinois Electric Distribution and $5 million recorded at Ameren Illinois Natural Gas. The revenue recorded at Ameren Illinois Electric Distribution was reflected in formula ratemaking, which resulted in no impact to net income. Per authoritative accounting guidance for sales to rate-regulated entities, the revenue recognized by Ameren Illinois was not eliminated upon consolidation by Ameren. |
Commitments and Contingencies (
Commitments and Contingencies (Tables) | 9 Months Ended |
Sep. 30, 2020 | |
Commitments and Contingencies Disclosure [Abstract] | |
Long-term Purchase Commitment | The table below presents our estimated minimum fuel, purchased power, and other commitments at September 30, 2020. Ameren’s and Ameren Illinois’ purchased power commitments include the Ameren Illinois agreements entered into as part of the IPA-administered power procurement process. Included in the Other column are minimum purchase commitments under contracts for equipment, design and construction, and meter reading services, among other agreements, at September 30, 2020. Coal Natural Gas (a) Nuclear Purchased Power (b)(c) Methane Other Total Ameren: 2020 $ 94 $ 52 $ 3 $ 57 (d) $ — $ 39 $ 245 2021 242 161 57 156 (d) 3 53 672 2022 193 108 12 63 3 23 402 2023 113 69 45 21 3 23 274 2024 94 28 20 4 3 20 169 Thereafter 55 73 21 — 21 61 231 Total $ 791 $ 491 $ 158 $ 301 $ 33 $ 219 $ 1,993 Ameren Missouri: 2020 $ 94 $ 12 $ 3 $ — $ — $ 22 $ 131 2021 242 43 57 — 3 46 391 2022 193 38 12 — 3 23 269 2023 113 32 45 — 3 23 216 2024 94 13 20 — 3 20 150 Thereafter 55 22 21 — 21 24 143 Total $ 791 $ 160 $ 158 $ — $ 33 $ 158 $ 1,300 Ameren Illinois: 2020 $ — $ 40 $ — $ 57 (d) $ — $ 14 $ 111 2021 — 118 — 156 (d) — 2 276 2022 — 70 — 63 — — 133 2023 — 37 — 21 — — 58 2024 — 15 — 4 — — 19 Thereafter — 51 — — — — 51 Total $ — $ 331 $ — $ 301 $ — $ 16 $ 648 (a) Includes amounts for generation and for distribution. (b) The purchased power amounts for Ameren and Ameren Illinois exclude agreements for renewable energy credits through 2035 with various renewable energy suppliers due to the contingent nature of the payment amounts, with the exception of expected payments of $36 million through 2024. (c) The purchased power amounts for Ameren and Ameren Missouri exclude a 102-megawatt power purchase agreement with a wind farm operator, which expires in 2024, due to the contingent nature of the payment amounts. (d) In January 2018, as required by the FEJA, Ameren Illinois entered into agreements to acquire zero emission credits through 2026. Annual zero emission credit commitment amounts will be published by the IPA each May prior to the start of the subsequent planning year, which begins each June. The amounts above reflect Ameren Illinois’ commitment to acquire $42 million of zero emission credits through May 2021. |
Callaway Energy Center (Tables)
Callaway Energy Center (Tables) | 9 Months Ended |
Sep. 30, 2020 | |
Nuclear Waste Matters [Abstract] | |
Schedule of Insurance Coverage at Callaway Energy Center | The following table presents insurance coverage at Ameren Missouri’s Callaway Energy Center at September 30, 2020: Type and Source of Coverage Most Recent Maximum Coverages Maximum Assessments Public liability and nuclear worker liability: American Nuclear Insurers January 1, 2020 $ 450 $ — Pool participation (a) 13,348 (a) 138 (b) $ 13,798 (c) $ 138 Property damage: NEIL and EMANI April 1, 2020 $ 3,200 (d) $ 25 (e) Replacement power: NEIL April 1, 2020 $ 490 (f) $ 7 (e) (a) Provided through mandatory participation in an industrywide retrospective premium assessment program. The maximum coverage available is dependent on the number of United States commercial reactors participating in the program. (b) Retrospective premium under the Price-Anderson Act. This is subject to retrospective assessment with respect to a covered loss in excess of $450 million in the event of an incident at any licensed United States commercial reactor, payable at $21 million per year. (c) Limit of liability for each incident under the Price-Anderson liability provisions of the Atomic Energy Act of 1954, as amended. This limit is subject to change to account for the effects of inflation and changes in the number of licensed power reactors. (d) NEIL provides $2.7 billion in property damage, stabilization, decontamination, and premature decommissioning insurance for radiation events and $2.3 billion in property damage insurance for nonradiation events. EMANI provides $490 million in property damage insurance for both radiation and nonradiation events. (e) All NEIL-insured plants could be subject to assessments should losses exceed the accumulated funds from NEIL. (f) Provides replacement power cost insurance in the event of a prolonged accidental outage. Weekly indemnity up to $4.5 million for 52 weeks, which commences after the first 12 weeks of an outage, plus up to $3.6 million per week for a minimum of 71 weeks thereafter for a total not exceeding the policy limit of $490 million. Nonradiation events are limited to $328 million. |
Retirement Benefits (Tables)
Retirement Benefits (Tables) | 9 Months Ended |
Sep. 30, 2020 | |
Retirement Benefits [Abstract] | |
Components Of Net Periodic Benefit Cost | The following table presents the components of the net periodic benefit cost (income) incurred for Ameren’s pension and postretirement benefit plans for the three and nine months ended September 30, 2020 and 2019: Pension Benefits Postretirement Benefits Three Months Nine Months Three Months Nine Months 2020 2019 2020 2019 2020 2019 2020 2019 Service cost (a) $ 28 $ 22 $ 83 $ 66 $ 4 $ 4 $ 14 $ 13 Non-service cost components: Interest cost 43 46 130 139 10 11 29 32 Expected return on plan assets (73) (69) (218) (207) (20) (19) (60) (57) Amortization of: Prior service benefit — — (1) — (1) (1) (3) (4) Actuarial loss (gain) 15 6 45 19 (3) (4) (7) (11) Total non-service cost components (b) $ (15) $ (17) $ (44) $ (49) $ (14) $ (13) $ (41) $ (40) Net periodic benefit cost (income) $ 13 $ 5 $ 39 $ 17 $ (10) $ (9) $ (27) $ (27) (a) Service cost, net of capitalization, is reflected in “Operating Expenses – Other operations and maintenance” on Ameren’s statement of income. (b) Non-service cost components are reflected in “Other Income, Net” on Ameren’s statement of income. See Note 5 – Other Income, Net for additional information. |
Summary Of Benefit Plan Costs Incurred | Ameren Missouri and Ameren Illinois are responsible for their respective share of Ameren’s pension and other postretirement costs. The following table presents the respective share of net periodic pension and other postretirement benefit costs (income) incurred for the three and nine months ended September 30, 2020 and 2019: Pension Benefits Postretirement Benefits Three Months Nine Months Three Months Nine Months 2020 2019 2020 2019 2020 2019 2020 2019 Ameren Missouri (a) $ 5 $ 1 $ 16 $ 3 $ (2) $ (1) $ (4) $ (4) Ameren Illinois 8 5 24 15 (8) (8) (24) (23) Other — (1) (1) (1) — — 1 — Ameren (a) $ 13 $ 5 $ 39 $ 17 $ (10) $ (9) $ (27) $ (27) (a) Does not include the impact of the regulatory tracking mechanism for the difference between the level of pension and postretirement benefit costs incurred by Ameren Missouri under GAAP and the level of such costs included in rates. |
Income Taxes Income Taxes (Tabl
Income Taxes Income Taxes (Tables) | 9 Months Ended |
Sep. 30, 2020 | |
Income Tax Disclosure [Abstract] | |
Schedule of Effective Income Tax Rate Reconciliation | The following table presents a reconciliation of the federal statutory corporate income tax rate to the effective income tax rate for the three and nine months ended September 30, 2020 and 2019: Ameren Ameren Missouri Ameren Illinois 2020 2019 2020 2019 2020 2019 Three Months Federal statutory corporate income tax rate: 21% 21% 21% 21% 21% 21% Increases (decreases) from: Amortization of deferred investment tax credit (1) (1) (1) (1) — — Amortization of excess deferred taxes (9) (a) (7) (16) (a) (11) (3) (3) Depreciation differences — — — — (1) — Renewable and other tax credits (1) — (2) — — — State tax 4 6 4 5 7 6 Stock-based compensation 1 1 — — — — Effective income tax rate 15% 20% 6% 14% 24% 24% Ameren Ameren Missouri Ameren Illinois 2020 2019 2020 2019 2020 2019 Nine Months Federal statutory corporate income tax rate: 21% 21% 21% 21% 21% 21% Increases (decreases) from: Amortization of deferred investment tax credit — (1) (1) (1) — — Amortization of excess deferred taxes (9) (a) (7) (16) (a) (12) (3) (4) Renewable and other tax credits (1) — (1) — — — State tax 5 6 3 5 7 7 Stock-based compensation (1) (1) — — — — Effective income tax rate 15% 18% 6% 13% 25% 24% (a) Increase in the amortization of excess deferred taxes pursuant to the MoPSC’s March 2020 electric rate order. See Note 2 – Rate and Regulatory Matters for additional information. |
Supplemental Information (Table
Supplemental Information (Tables) | 9 Months Ended |
Sep. 30, 2020 | |
Supplemental Information [Abstract] | |
Schedule of Cash and Cash Equivalents Including Restricted Cash | The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets and the statements of cash flows as of September 30, 2020, and December 31, 2019: September 30, 2020 December 31, 2019 Ameren Ameren Ameren Ameren Ameren Ameren Cash and cash equivalents $ 6 $ — $ — $ 16 $ 9 $ — Restricted cash included in “Other current assets” 14 4 5 14 4 5 Restricted cash included in “Other assets” 142 — 142 120 — 120 Restricted cash included in “Nuclear decommissioning trust fund” 6 6 — 26 26 — Total cash, cash equivalents, and restricted cash $ 168 $ 10 $ 147 $ 176 $ 39 $ 125 |
Schedule of Accounts, Notes, Loans and Financing Receivable | The following table provides a reconciliation of the beginning and ending amount of the allowance for doubtful accounts for the three and nine months ended September 30, 2020 and 2019: Three Months Nine Months 2020 2019 2020 2019 Ameren: Beginning of period $ 25 $ 19 $ 17 $ 18 Bad debt expense 21 14 31 22 Net write-offs (2) (14) (4) (21) End of period $ 44 $ 19 $ 44 $ 19 Ameren Missouri: Beginning of period $ 9 $ 7 $ 7 $ 7 Bad debt expense 5 3 9 6 Net write-offs — (2) (2) (5) End of period $ 14 $ 8 $ 14 $ 8 Ameren Illinois: (a) Beginning of Period $ 16 $ 12 $ 10 $ 11 Bad debt expense 16 11 22 16 Net write-offs (2) (12) (2) (16) End of Period $ 30 $ 11 $ 30 $ 11 (a) Ameren Illinois has rate-adjustment mechanisms that allow it to recover the difference between its actual net bad debt write-offs under GAAP, including those associated with receivables purchased from alternative retail electric suppliers, and the amount of net bad debt write-offs included in its base rates. In 2020, the rate-adjustment mechanism for electric distribution allows for recovery of bad debt expense recognized under GAAP. See Note 2 – Rate and Regulatory Matters for additional information. |
Schedule of Cash Flow, Supplemental Disclosures | Supplemental Cash Flow Information The following table provides noncash financing and investing activity excluded from the statements of cash flows for the nine months ended September 30, 2020 and 2019: September 30, 2020 September 30, 2019 Ameren Ameren Ameren Ameren Ameren Ameren Investing Exchange of bond investments for the extinguishment of senior unsecured notes $ — $ — $ — $ 17 $ — $ 17 Accrued capital expenditures 311 115 191 273 138 128 Net realized and unrealized gain (loss) – nuclear decommissioning trust fund 43 43 — 100 100 — Financing Exchange of bond investments for the extinguishment of senior unsecured notes $ — $ — $ — $ (17) $ — $ (17) Issuance of common stock for stock-based compensation 38 — — 54 — — |
Asset Retirement Obligation Disclosure | The following table provides a reconciliation of the beginning and ending carrying amount of AROs for the nine months ended September 30, 2020: Ameren Ameren Ameren Balance at December 31, 2019 $ 687 $ 4 (a) $ 691 (b) Liabilities settled (42) — (42) Accretion 21 (c) 1 (c) 22 (c) Change in estimates 57 (d) — 57 (d) Balance at September 30, 2020 $ 723 $ 5 (a) $ 728 (b) (a) Included in “Other deferred credits and liabilities” on the balance sheet. (b) Balance included $53 million in “Other current liabilities” on the balance sheet as of both December 31, 2019, and September 30, 2020. (c) Accretion expense attributable to Ameren Missouri and Ameren Illinois was recorded as a decrease to regulatory liabilities and an increase to regulatory assets, respectively. (d) Ameren Missouri changed its fair value estimate primarily due to an update to the decommissioning of the Callaway Energy Center to reflect the cost study and funding analysis filed with the MoPSC in November 2020 and an increase in the cost estimate for closure of certain CCR storage facilities. |
Schedule of excise taxes | The following table presents the excise taxes recorded on a gross basis in “Operating Revenues – Electric,” “Operating Revenues – Natural gas” and “Operating Expenses – Taxes other than income taxes” on the statements of income for the three and nine months ended September 30, 2020 and 2019: Three Months Nine Months 2020 2019 2020 2019 Ameren Missouri $ 45 $ 49 $ 111 $ 118 Ameren Illinois 26 27 87 91 Ameren $ 71 $ 76 $ 198 $ 209 |
Schedule of Earnings Per Share, Basic and Diluted | The following table reconciles the basic weighted-average number of common shares outstanding to the diluted weighted-average number of common shares outstanding for the three and nine months ended September 30, 2020 and 2019: Three Months Nine Months 2020 2019 2020 2019 Weighted-average Common Shares Outstanding – Basic 247.1 245.9 246.8 245.5 Assumed settlement of performance share units and restricted stock units 1.5 1.4 1.2 1.4 Dilutive effect of forward sale agreement 0.6 0.2 0.4 0.1 Weighted-average Common Shares Outstanding – Diluted (a) 249.2 247.5 248.4 247.0 (a) There were no potentially dilutive securities excluded from the earnings per diluted share calculations for the three and nine months ended September 30, 2020 and 2019. |
Segment Information (Tables)
Segment Information (Tables) | 9 Months Ended |
Sep. 30, 2020 | |
Segment Reporting [Abstract] | |
Schedule Of Segment Reporting Information By Segment | The following tables present revenues, net income (loss) attributable to common shareholders, and capital expenditures by segment at Ameren and Ameren Illinois for the three and nine months ended September 30, 2020 and 2019. Ameren, Ameren Missouri, and Ameren Illinois management review segment capital expenditure information rather than any individual or total asset amount. For additional information about our segments, see Note 16 – Segment Information under Part II, Item 8, of the Form 10-K. Ameren Ameren Missouri Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Transmission Other Intersegment Eliminations Ameren Three Months 2020: External revenues $ 990 $ 390 $ 122 $ 126 $ — $ — $ 1,628 Intersegment revenues 11 1 — 15 (a) — (27) — Net income (loss) attributable to Ameren common shareholders 297 34 2 62 (b) (28) — 367 Capital expenditures 262 129 81 185 2 (3) 656 Three Months 2019: External revenues $ 1,050 $ 374 $ 107 $ 109 $ — $ — $ 1,640 Intersegment revenues 9 15 5 19 (a) — (29) 19 (c) Net income (loss) attributable to Ameren common shareholders 300 32 (1) 53 (b) (20) — 364 Capital expenditures 256 139 113 129 (7) 6 636 Nine Months 2020: External revenues $ 2,442 $ 1,131 $ 533 $ 360 $ — $ — $ 4,466 Intersegment revenues 31 2 — 40 (a) — (73) — Net income (loss) attributable to Ameren common shareholders 439 107 66 168 (b) (24) — 756 Capital expenditures 778 391 221 490 4 — 1,884 Nine Months 2019: External revenues $ 2,591 $ 1,118 $ 563 $ 303 $ — $ — $ 4,575 Intersegment revenues 24 17 5 48 (a) — (75) 19 (c) Net income (loss) attributable to Ameren common shareholders 446 105 57 139 (b) (13) — 734 Capital expenditures 751 390 241 377 3 (1) 1,761 (a) Ameren Transmission earns revenue from transmission service provided to Ameren Illinois Electric Distribution. (b) Ameren Transmission earnings reflect an allocation of financing costs from Ameren (parent). (c) Intersegment revenues at Ameren include $14 million and $5 million of revenue from Ameren Illinois Electric Distribution and Ameren Illinois Natural Gas, respectively, for the three and nine months ended September 30, 2019, for a software licensing agreement with Ameren Missouri. Under authoritative accounting guidance for rate-regulated entities, the revenue recognized by Ameren Illinois was not eliminated upon consolidation. See Note 8 – Related-party Transactions under Part I, Item 1, of this report for additional information. Ameren Illinois Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Illinois Transmission Intersegment Eliminations Ameren Illinois Three Months 2020: External revenues $ 391 $ 122 $ 76 $ — $ 589 Intersegment revenues — — 15 (a) (15) — Net income available to common shareholder 34 2 41 — 77 Capital expenditures 129 81 160 — 370 Three Months 2019: External revenues $ 389 $ 112 $ 63 $ — $ 564 Intersegment revenues — — 18 (a) (18) — Net income (loss) available to common shareholder 32 (1) 34 — 65 Capital expenditures 139 113 92 — 344 Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Illinois Transmission Intersegment Eliminations Ameren Illinois Nine Months 2020: External revenues $ 1,133 $ 533 $ 213 $ — $ 1,879 Intersegment revenues — — 39 (a) (39) — Net income available to common shareholder 107 66 107 — 280 Capital expenditures 391 221 419 — 1,031 Nine Months 2019: External revenues $ 1,135 $ 568 $ 170 $ — $ 1,873 Intersegment revenues — — 47 (a) (47) — Net income available to common shareholder 105 57 85 — 247 Capital expenditures 390 241 269 — 900 (a) Ameren Illinois Transmission earns revenue from transmission service provided to Ameren Illinois Electric Distribution. |
Disaggregation of Revenue | The following tables present disaggregated revenues by segment at Ameren and Ameren Illinois for the three and nine months ended September 30, 2020 and 2019. Economic factors affect the nature, timing, amount, and uncertainty of revenues and cash flows in a similar manner across customer classes. Revenues from alternative revenue programs have a similar distribution among customer classes as revenues from contracts with customers. Other revenues not associated with contracts with customers are presented in the Other customer classification, along with electric transmission and off-system revenues. Ameren Ameren Missouri Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Transmission Intersegment Eliminations Ameren Three Months 2020: Residential $ 455 $ 234 $ — $ — $ — $ 689 Commercial 343 127 — — — 470 Industrial 87 26 — — — 113 Other 99 4 — 141 (27) 217 Total electric revenues $ 984 $ 391 $ — $ 141 $ (27) $ 1,489 Residential $ 8 $ — $ 68 $ — $ — $ 76 Commercial 3 — 18 — — 21 Industrial 1 — 5 — — 6 Other 5 — 31 — — 36 Total gas revenues $ 17 $ — $ 122 $ — $ — $ 139 Total revenues (a) $ 1,001 $ 391 $ 122 $ 141 $ (27) $ 1,628 Three Months 2019: Residential $ 489 $ 224 $ — $ — $ — $ 713 Commercial 394 123 — — — 517 Industrial 94 27 — — — 121 Other 63 15 (b) — 128 (29) 177 Total electric revenues $ 1,040 $ 389 $ — $ 128 $ (29) $ 1,528 Residential $ 8 $ — $ 65 $ — $ — $ 73 Commercial 4 — 17 — — 21 Industrial 1 — 2 — — 3 Other 6 — 28 (b) — — 34 Total gas revenues $ 19 $ — $ 112 $ — $ — $ 131 Total revenues (a) $ 1,059 $ 389 $ 112 $ 128 $ (29) $ 1,659 Ameren Missouri Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Transmission Intersegment Eliminations Ameren Nine Months 2020: Residential $ 1,111 $ 664 $ — $ — $ — $ 1,775 Commercial 828 365 — — — 1,193 Industrial 207 91 — — — 298 Other 240 13 — 400 (73) 580 Total electric revenues $ 2,386 $ 1,133 $ — $ 400 $ (73) $ 3,846 Residential $ 52 $ — $ 375 $ — $ — $ 427 Commercial 20 — 94 — — 114 Industrial 3 — 11 — — 14 Other 12 — 53 — — 65 Total natural gas revenues $ 87 $ — $ 533 $ — $ — $ 620 Total revenues (a) $ 2,473 $ 1,133 $ 533 $ 400 $ (73) $ 4,466 Nine Months 2019: Residential $ 1,134 $ 640 $ — $ — $ — $ 1,774 Commercial 943 370 — — — 1,313 Industrial 226 94 — — — 320 Other 214 31 (b) — 351 (75) 521 Total electric revenues $ 2,517 $ 1,135 $ — $ 351 $ (75) $ 3,928 Residential $ 56 $ — $ 399 $ — $ — $ 455 Commercial 24 — 105 — — 129 Industrial 3 — 9 — — 12 Other 15 — 55 (b) — — 70 Total natural gas revenues $ 98 $ — $ 568 $ — $ — $ 666 Total revenues (a) $ 2,615 $ 1,135 $ 568 $ 351 $ (75) $ 4,594 (a) The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the three and nine months ended September 30, 2020 and 2019: Ameren Missouri Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Transmission Ameren Three Months 2020: Revenues from alternative revenue programs $ 1 $ (110) $ 3 $ 4 $ (102) Other revenues not from contracts with customers 6 5 — — 11 Three Months 2019: Revenues from alternative revenue programs $ 26 $ (145) $ 1 $ (12) $ (130) Other revenues not from contracts with customers 5 1 1 — 7 Nine Months 2020: Revenues from alternative revenue programs $ (8) $ (59) $ 17 $ 34 $ (16) Other revenues not from contracts with customers 21 6 1 — 28 Nine Months 2019: Revenues from alternative revenue programs $ 41 $ (111) $ 2 $ (25) $ (93) Other revenues not from contracts with customers 14 5 2 — 21 (b) Includes $14 million and $5 million for Ameren Illinois Electric Distribution and Ameren Illinois Natural Gas, respectively, for the three and nine months ended September 30, 2019, for a software licensing agreement with Ameren Missouri. See Note 8 – Related-party Transactions for additional information. Ameren Illinois Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Illinois Transmission Intersegment Eliminations Ameren Illinois Three Months 2020: Residential $ 234 $ 68 $ — $ — $ 302 Commercial 127 18 — — 145 Industrial 26 5 — — 31 Other 4 31 91 (15) 111 Total revenues (a) $ 391 $ 122 $ 91 $ (15) $ 589 Three Months 2019: Residential $ 224 $ 65 $ — $ — $ 289 Commercial 123 17 — — 140 Industrial 27 2 — — 29 Other 15 (b) 28 (b) 81 (18) 106 Total revenues (a) $ 389 $ 112 $ 81 $ (18) $ 564 Nine Months 2020: Residential $ 664 $ 375 $ — $ — $ 1,039 Commercial 365 94 — — 459 Industrial 91 11 — — 102 Other 13 53 252 (39) 279 Total revenues (a) $ 1,133 $ 533 $ 252 $ (39) $ 1,879 Nine Months 2019: Residential $ 640 $ 399 $ — $ — $ 1,039 Commercial 370 105 — — 475 Industrial 94 9 — — 103 Other 31 (b) 55 (b) 217 (47) 256 Total revenues (a) $ 1,135 $ 568 $ 217 $ (47) $ 1,873 (a) The following table presents increases/(decreases) in revenues from alternative revenue programs and other revenues not from contracts with customers for the Ameren Illinois segments for the three and nine months ended September 30, 2020 and 2019: Ameren Illinois Electric Distribution Ameren Illinois Natural Gas Ameren Illinois Transmission Ameren Illinois Three Months 2020: Revenues from alternative revenue programs $ (110) $ 3 $ 5 $ (102) Other revenues not from contracts with customers 5 — — 5 Three Months 2019: Revenues from alternative revenue programs $ (145) $ 1 $ (12) $ (156) Other revenues not from contracts with customers 1 1 — 2 Nine Months 2020: Revenues from alternative revenue programs $ (59) $ 17 $ 29 $ (13) Other revenues not from contracts with customers 6 1 — 7 Nine Months 2019: Revenues from alternative revenue programs $ (111) $ 2 $ (26) $ (135) Other revenues not from contracts with customers 5 2 — 7 (b) Includes $14 million and $5 million for Ameren Illinois Electric Distribution and Ameren Illinois Natural Gas, respectively, for the three and nine months ended September 30, 2019, for a software licensing agreement with Ameren Missouri. See Note 8 – Related-party Transactions for additional information. |
Summary of Significant Accoun_3
Summary of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 |
Basis Of Presentation And Significant Accounting Policies [Line Items] | |||||
Workforce Utilizing Remote Work Arrangement | 50.00% | 65.00% | |||
Percentage of accounts receivable balances that are 30 days past due or are part of a deferred payment arrangement | 26.00% | 13.00% | |||
Accounts receivable balances that are 30 days or more past due or part of a deferred payment arrangement | $ 151 | $ 65 | |||
Unrecorded Unconditional Purchase Obligation | 1,993 | ||||
Cash Surrender Value of Life Insurance | 260 | $ 264 | |||
Corporate owned life insurance, borrowings | $ 107 | 114 | |||
Union Electric Company | |||||
Basis Of Presentation And Significant Accounting Policies [Line Items] | |||||
Percentage of accounts receivable balances that are 30 days past due or are part of a deferred payment arrangement | 18.00% | 9.00% | |||
Accounts receivable balances that are 30 days or more past due or part of a deferred payment arrangement | $ 49 | $ 23 | |||
Unrecorded Unconditional Purchase Obligation | $ 1,300 | ||||
Ameren Illinois Company | |||||
Basis Of Presentation And Significant Accounting Policies [Line Items] | |||||
Percentage of accounts receivable balances that are 30 days past due or are part of a deferred payment arrangement | 35.00% | 18.00% | |||
Accounts receivable balances that are 30 days or more past due or part of a deferred payment arrangement | $ 102 | $ 42 | |||
Unrecorded Unconditional Purchase Obligation | 648 | ||||
Cash Surrender Value of Life Insurance | 114 | 123 | |||
Corporate owned life insurance, borrowings | 107 | 114 | |||
Variable Interest Entity, Not Primary Beneficiary | |||||
Basis Of Presentation And Significant Accounting Policies [Line Items] | |||||
Variable Interest Entity, Reporting Entity Involvement, Maximum Loss Exposure, Amount | 18 | ||||
Equity Method Investments | 34 | $ 28 | |||
Partnership Funding Commitment | |||||
Basis Of Presentation And Significant Accounting Policies [Line Items] | |||||
Unrecorded Unconditional Purchase Obligation | $ 37 |
Rate And Regulatory Matters (Na
Rate And Regulatory Matters (Narrative-Missouri) (Detail) $ in Millions | 3 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended | ||||
Mar. 31, 2021USD ($) | Sep. 30, 2020USD ($)MWh | Sep. 30, 2019USD ($) | Sep. 30, 2020USD ($) | Sep. 30, 2020USD ($)MWh | Sep. 30, 2019USD ($) | Dec. 31, 2019MWh | Dec. 31, 2018MWh | |
Rate And Regulatory Matters [Line Items] | ||||||||
Purchased Power | $ 140 | $ 148 | $ 383 | $ 440 | ||||
Other operations and maintenance | 418 | 434 | 1,240 | 1,301 | ||||
Income Taxes | 63 | 92 | 134 | 158 | ||||
Donations | 0 | 1 | 14 | 8 | ||||
Union Electric Company | ||||||||
Rate And Regulatory Matters [Line Items] | ||||||||
Purchased Power | 48 | 49 | 124 | 160 | ||||
Other operations and maintenance | 221 | 242 | 662 | 720 | ||||
Income Taxes | 18 | 51 | 29 | 70 | ||||
Donations | $ 0 | $ 1 | 9 | 3 | ||||
Net costs and forgone late fees related to the COVID-19 Pandemic | $ 9 | |||||||
Final Rate Order | Electricity | Union Electric Company | ||||||||
Rate And Regulatory Matters [Line Items] | ||||||||
Public Utilities, Requested Rate Increase (Decrease), Amount | 32 | |||||||
Reduction to annualized base level of net energy costs | 115 | |||||||
Revenues | 20 | |||||||
Purchased Power | 15 | |||||||
Other operations and maintenance | 60 | |||||||
Income Taxes | 20 | |||||||
Revenue requirement change due to MEEIA sales volumes | 50 | |||||||
Amounts previously deferred under PISA | 50 | |||||||
Donations | $ 8 | |||||||
Wind Generation Facility | Union Electric Company | ||||||||
Rate And Regulatory Matters [Line Items] | ||||||||
Amount of Megawatts | MWh | 400 | 300 | 300 | 400 | ||||
Estimated Capital Project Costs | $ 1,200 | |||||||
Wind Generation Facility | Union Electric Company | Subsequent Event | ||||||||
Rate And Regulatory Matters [Line Items] | ||||||||
Project Placed In-Service Amount | $ 200 | |||||||
MEEIA 2019 [Member] | Final Rate Order | Electricity | Union Electric Company | ||||||||
Rate And Regulatory Matters [Line Items] | ||||||||
Revenues | $ 6 | |||||||
Incentive Award if Energy Efficiency Goals Are Achieved | 11 | |||||||
Incentive Award if Energy Efficiency Goals Are Exceeded | 1 | |||||||
MEEIA Energy Efficiency Investments for the 2022 Program Year | $ 70 | |||||||
MEEIA 2013 & 2016 | Final Rate Order | Electricity | Union Electric Company | ||||||||
Rate And Regulatory Matters [Line Items] | ||||||||
Revenues | $ 38 | |||||||
Minimum | Final Rate Order | Electricity | Union Electric Company | ||||||||
Rate And Regulatory Matters [Line Items] | ||||||||
Public Utilities, Requested Return on Equity, Percentage | 9.40% | |||||||
Maximum | Final Rate Order | Electricity | Union Electric Company | ||||||||
Rate And Regulatory Matters [Line Items] | ||||||||
Public Utilities, Requested Return on Equity, Percentage | 9.80% |
Rate And Regulatory Matters (_2
Rate And Regulatory Matters (Narrative-Illinois) (Detail) - Ameren Illinois Company - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | |||
Oct. 31, 2020 | Sep. 30, 2020 | May 31, 2020 | Apr. 30, 2020 | Sep. 30, 2020 | Sep. 30, 2020 | |
Rate And Regulatory Matters [Line Items] | ||||||
Deferred payment arrangement extension | 24 months | |||||
Financial assistance program costs | $ 8 | |||||
Pending Rate Case | Natural Gas | ||||||
Rate And Regulatory Matters [Line Items] | ||||||
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 97 | |||||
Revenues | $ 46 | |||||
Public Utilities, Requested Return on Equity, Percentage | 10.50% | |||||
Public Utilities, Requested Equity Capital Structure, Percentage | 54.10% | |||||
Rate Base | $ 2,100 | |||||
Pending Rate Case | IEIMA | Electric Distribution | ||||||
Rate And Regulatory Matters [Line Items] | ||||||
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 45 | |||||
ICC Staff recommended rate increase (decrease) | $ (49) | |||||
Pending Rate Case | FEJA energy-efficiency rider | Electric Distribution | ||||||
Rate And Regulatory Matters [Line Items] | ||||||
Public Utilities, Requested Rate Increase (Decrease), Amount | $ 7 | |||||
Subsequent Event | Pending Rate Case | Natural Gas | ||||||
Rate And Regulatory Matters [Line Items] | ||||||
ICC Staff recommended rate increase (decrease) | $ 69 | |||||
ICC Staff recommended Return on Equity, Percentage | 9.30% | |||||
ICC Staff recommended Equity Capital Structure, Percentage | 50.40% | |||||
ICC Staff recommended Rate Base | $ 2,100 |
Rate And Regulatory Matters (_3
Rate And Regulatory Matters (Narrative-Federal) (Detail) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | ||
May 31, 2020 | Nov. 30, 2019 | Jun. 30, 2020 | Sep. 30, 2020 | Dec. 31, 2019 | |
Rate And Regulatory Matters [Line Items] | |||||
Lower revenue due to transmission formula rate revisions | $ 2 | ||||
Income recognized due to higher FERC-allowed base ROE | 13 | ||||
Current regulatory liabilities | $ 96 | $ 164 | |||
Incentive adder cap on FERC allowed return on equity | 2.50% | ||||
Ameren Illinois Company | |||||
Rate And Regulatory Matters [Line Items] | |||||
Income recognized due to higher FERC-allowed base ROE | $ 7 | ||||
Current regulatory liabilities | $ 47 | $ 84 | |||
Midwest Independent Transmission System Operator, Inc | |||||
Rate And Regulatory Matters [Line Items] | |||||
Public Utilities, Requested Return on Equity, Percentage | 12.38% | ||||
Midwest Independent Transmission System Operator, Inc | Final Rate Order | |||||
Rate And Regulatory Matters [Line Items] | |||||
Public Utilities, Requested Return on Equity, Percentage | 10.02% | 9.88% | 10.02% | 10.32% | |
Customer Requested Rate on Equity | 9.15% | ||||
Current regulatory liabilities | $ 15 | ||||
Incentive adder to FERC allowed base return on common equity | 0.50% | ||||
Midwest Independent Transmission System Operator, Inc | Final Rate Order | Ameren Illinois Company | |||||
Rate And Regulatory Matters [Line Items] | |||||
Current regulatory liabilities | $ 7 | ||||
Midwest Independent Transmission System Operator, Inc | Notice of Proposed Rulemaking | |||||
Rate And Regulatory Matters [Line Items] | |||||
Incentive adder to FERC allowed base return on common equity | 1.00% | ||||
Maximum | Midwest Independent Transmission System Operator, Inc | Final Rate Order | |||||
Rate And Regulatory Matters [Line Items] | |||||
Public Utilities, Requested Return on Equity, Percentage | 10.82% |
Short-Term Debt And Liquidity_2
Short-Term Debt And Liquidity (Narrative) (Detail) $ in Billions | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2020USD ($) | Sep. 30, 2019 | Sep. 30, 2020USD ($) | Sep. 30, 2019 | |
Credit Agreements | ||||
Short-term Debt [Line Items] | ||||
Net Liquidity Available | $ 2 | $ 2 | ||
Actual debt-to-capital ratio | 0.55 | 0.55 | ||
Utilities | ||||
Short-term Debt [Line Items] | ||||
Short-term Debt, Weighted Average Interest Rate, over Time | 0.10% | 2.40% | 0.81% | 2.67% |
Union Electric Company | Missouri Credit Agreement | ||||
Short-term Debt [Line Items] | ||||
Actual debt-to-capital ratio | 0.48 | 0.48 | ||
Ameren Illinois Company | Illinois Credit Agreement | ||||
Short-term Debt [Line Items] | ||||
Actual debt-to-capital ratio | 0.45 | 0.45 |
Short-Term Debt and Liquidity_3
Short-Term Debt and Liquidity (Short-Term Debt outstanding) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 |
Short-term Debt [Line Items] | ||
Short-term debt | $ 272 | $ 440 |
Union Electric Company | ||
Short-term Debt [Line Items] | ||
Short-term debt | 0 | 234 |
Ameren Illinois Company | ||
Short-term Debt [Line Items] | ||
Short-term debt | 242 | 53 |
Commercial Paper | ||
Short-term Debt [Line Items] | ||
Short-term debt | 272 | 440 |
Commercial Paper | Ameren (parent) | ||
Short-term Debt [Line Items] | ||
Short-term debt | 30 | 153 |
Commercial Paper | Union Electric Company | ||
Short-term Debt [Line Items] | ||
Short-term debt | 0 | 234 |
Commercial Paper | Ameren Illinois Company | ||
Short-term Debt [Line Items] | ||
Short-term debt | $ 242 | $ 53 |
Short-Term Debt and Liquidity_4
Short-Term Debt and Liquidity (Short-Term Debt Activity) (Details) - Commercial Paper - USD ($) $ in Millions | 9 Months Ended | |
Sep. 30, 2020 | Sep. 30, 2019 | |
Short-term Debt [Line Items] | ||
Short-term Debt, Average Outstanding Amount | $ 257 | $ 821 |
Weighted-average interest rate | 1.70% | 2.68% |
Short-term Debt, Maximum Amount Outstanding During Period | $ 908 | $ 1,113 |
Peak interest rate | 5.05% | 5.00% |
Ameren (parent) | ||
Short-term Debt [Line Items] | ||
Short-term Debt, Average Outstanding Amount | $ 62 | $ 532 |
Weighted-average interest rate | 2.04% | 2.70% |
Short-term Debt, Maximum Amount Outstanding During Period | $ 425 | $ 651 |
Peak interest rate | 3.30% | 3.80% |
Union Electric Company | ||
Short-term Debt [Line Items] | ||
Short-term Debt, Average Outstanding Amount | $ 142 | $ 141 |
Weighted-average interest rate | 1.76% | 2.73% |
Short-term Debt, Maximum Amount Outstanding During Period | $ 573 | $ 549 |
Peak interest rate | 5.05% | 2.97% |
Ameren Illinois Company | ||
Short-term Debt [Line Items] | ||
Short-term Debt, Average Outstanding Amount | $ 53 | $ 147 |
Weighted-average interest rate | 1.10% | 2.58% |
Short-term Debt, Maximum Amount Outstanding During Period | $ 243 | $ 310 |
Peak interest rate | 3.40% | 5.00% |
Long-Term debt and Equity Fin_2
Long-Term debt and Equity Financings (Narrative) (Details) shares in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | ||||||
Oct. 31, 2020USD ($) | Sep. 30, 2020USD ($)shares | Mar. 31, 2020USD ($)shares | Sep. 30, 2019shares | Sep. 30, 2020USD ($)shares | Sep. 30, 2019USD ($)shares | Oct. 30, 2020USD ($)numberOfWindGenerationFacilities | Apr. 30, 2020USD ($) | Aug. 05, 2019shares | |
Long-Term Debt And Equity Financings [Line Items] | |||||||||
Stock Issued During Period, Shares, New Issues | shares | 0.1 | 0.2 | 0.5 | 0.7 | |||||
Issuance of common stock | $ 10,000,000 | $ 37,000,000 | $ 54,000,000 | ||||||
Stock Issued During Period, Shares, Other | shares | 0 | 0.5 | 0 | 0.5 | 0.8 | ||||
Issuance of common stock for stock-based compensation | $ 38,000,000 | $ 38,000,000 | $ 54,000,000 | ||||||
Forward Contract Indexed to Issuer's Equity, Indexed Shares (in shares) | shares | 7.5 | ||||||||
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value | $ 543,000,000 | 543,000,000 | |||||||
Period End Net Cash Settlement Price | $ 54,000,000 | $ 54,000,000 | |||||||
Period End Net Share Settlement Price (in shares) | shares | 0.7 | 0.7 | |||||||
Ameren (parent) | Unsecured Debt | Senior Unsecured Notes 3.50% Due 2031 | |||||||||
Long-Term Debt And Equity Financings [Line Items] | |||||||||
Debt Instrument, Face Amount | $ 800,000,000 | ||||||||
Debt Instrument, Interest Rate, Stated Percentage | 3.50% | ||||||||
Proceeds from Issuance of Debt | $ 793,000,000 | ||||||||
Ameren (parent) | Unsecured Debt | Senior Unsecured Notes270 due 2020 | Subsequent Event | |||||||||
Long-Term Debt And Equity Financings [Line Items] | |||||||||
Debt Instrument, Face Amount | $ 350,000,000 | ||||||||
Debt Instrument, Interest Rate, Stated Percentage | 2.70% | ||||||||
Union Electric Company | |||||||||
Long-Term Debt And Equity Financings [Line Items] | |||||||||
Issuance of common stock for stock-based compensation | 0 | 0 | |||||||
Union Electric Company | Secured Debt | First Mortgage Bonds, 2.95%, Due 2030 - $465 Issuance | |||||||||
Long-Term Debt And Equity Financings [Line Items] | |||||||||
Debt Instrument, Face Amount | $ 465,000,000 | ||||||||
Debt Instrument, Interest Rate, Stated Percentage | 2.95% | ||||||||
Proceeds from Issuance of Secured Debt | 462,000,000 | ||||||||
Union Electric Company | Secured Debt | Senior Secured Notes, 5.00%, Due 2020 | |||||||||
Long-Term Debt And Equity Financings [Line Items] | |||||||||
Debt Instrument, Face Amount | $ 85,000,000 | $ 85,000,000 | |||||||
Debt Instrument, Interest Rate, Stated Percentage | 5.00% | 5.00% | |||||||
Union Electric Company | Secured Debt | First Mortgage Bonds, 2.625%, Due 2051 - $550 Issuance [Member] | Subsequent Event | |||||||||
Long-Term Debt And Equity Financings [Line Items] | |||||||||
Debt Instrument, Face Amount | $ 550,000,000 | ||||||||
Debt Instrument, Interest Rate, Stated Percentage | 2.625% | ||||||||
Proceeds from Issuance of Secured Debt | $ 543,000,000 | ||||||||
Number Of Wind Generation Facilities | numberOfWindGenerationFacilities | 2 | ||||||||
Ameren Illinois Company | |||||||||
Long-Term Debt And Equity Financings [Line Items] | |||||||||
Issuance of common stock for stock-based compensation | $ 0 | 0 | |||||||
Capital contributions from parent | $ 350,000,000 | $ 0 |
Other Income, Net (Detail)
Other Income, Net (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | |
Other Nonoperating Income (Expense) [Line Items] | ||||
Allowance for equity funds used during construction | $ 12 | $ 7 | $ 25 | $ 20 |
Interest income on industrial development revenue bonds | 7 | 6 | 19 | 19 |
Other interest income | 0 | 2 | 2 | 6 |
Non-service cost components of net periodic benefit income | 32 | 23 | 85 | 67 |
Miscellaneous income | 1 | 2 | 10 | 6 |
Donations | 0 | (1) | (14) | (8) |
Miscellaneous expense | (4) | (5) | (10) | (11) |
Total Other Income, Net | 48 | 34 | 117 | 99 |
Union Electric Company | ||||
Other Nonoperating Income (Expense) [Line Items] | ||||
Allowance for equity funds used during construction | 7 | 6 | 15 | 14 |
Interest income on industrial development revenue bonds | 7 | 6 | 19 | 19 |
Non-service cost components of net periodic benefit income | 13 | 4 | 32 | 13 |
Miscellaneous income | 1 | 2 | 3 | 4 |
Donations | 0 | (1) | (9) | (3) |
Miscellaneous expense | (2) | (2) | (5) | (4) |
Total Other Income, Net | 26 | 15 | 55 | 43 |
Defined Benefit Plan, Non-service Cost or Income Components - Tracker | (3) | 7 | (1) | 22 |
Ameren Illinois Company | ||||
Other Nonoperating Income (Expense) [Line Items] | ||||
Allowance for equity funds used during construction | 5 | 1 | 10 | 6 |
Other interest income | 0 | 1 | 2 | 5 |
Non-service cost components of net periodic benefit income | 12 | 12 | 36 | 36 |
Miscellaneous income | 1 | 1 | 6 | 3 |
Donations | 0 | 0 | (5) | (5) |
Miscellaneous expense | (1) | (2) | (4) | (6) |
Total Other Income, Net | $ 17 | $ 13 | 45 | $ 39 |
Final Rate Order | Electricity | Union Electric Company | ||||
Other Nonoperating Income (Expense) [Line Items] | ||||
Donations | $ (8) |
Derivative Financial Instrume_3
Derivative Financial Instruments (Open Gross Derivative Volumes By Commodity Type) (Detail) lb in Thousands, gal in Millions, MWh in Millions, MMBTU in Millions | 9 Months Ended | 12 Months Ended |
Sep. 30, 2020MMBTUMWhlbgal | Dec. 31, 2019MMBTUMWhlbgal | |
Fuel Oils | ||
Derivative [Line Items] | ||
Derivative, Nonmonetary Notional Amount, Volume | gal | 44 | 58 |
Natural Gas | ||
Derivative [Line Items] | ||
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 155 | 156 |
Power | ||
Derivative [Line Items] | ||
Derivative, Nonmonetary Notional Amount, Energy Measure | MWh | 13 | 12 |
Uranium | ||
Derivative [Line Items] | ||
Derivative, Nonmonetary Notional Amount, Mass | lb | 365 | 565 |
Union Electric Company | Fuel Oils | ||
Derivative [Line Items] | ||
Derivative, Nonmonetary Notional Amount, Volume | gal | 44 | 58 |
Union Electric Company | Natural Gas | ||
Derivative [Line Items] | ||
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 32 | 20 |
Union Electric Company | Power | ||
Derivative [Line Items] | ||
Derivative, Nonmonetary Notional Amount, Energy Measure | MWh | 6 | 5 |
Union Electric Company | Uranium | ||
Derivative [Line Items] | ||
Derivative, Nonmonetary Notional Amount, Mass | lb | 365 | 565 |
Ameren Illinois Company | Fuel Oils | ||
Derivative [Line Items] | ||
Derivative, Nonmonetary Notional Amount, Volume | gal | 0 | 0 |
Ameren Illinois Company | Natural Gas | ||
Derivative [Line Items] | ||
Derivative, Nonmonetary Notional Amount, Energy Measure | MMBTU | 123 | 136 |
Ameren Illinois Company | Power | ||
Derivative [Line Items] | ||
Derivative, Nonmonetary Notional Amount, Energy Measure | MWh | 7 | 7 |
Ameren Illinois Company | Uranium | ||
Derivative [Line Items] | ||
Derivative, Nonmonetary Notional Amount, Mass | lb | 0 | 0 |
Derivative Financial Instrume_4
Derivative Financial Instruments (Derivative Instruments Carrying Value) (Detail) - Not Designated As Hedging Instrument - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 |
Derivative [Line Items] | ||
Derivative assets | $ 33 | $ 26 |
Derivative liabilities | 246 | 255 |
Fuel Oils | Other Current Assets | ||
Derivative [Line Items] | ||
Derivative assets | 2 | 4 |
Fuel Oils | Other Assets | ||
Derivative [Line Items] | ||
Derivative assets | 0 | 2 |
Fuel Oils | Other Current Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 14 | 4 |
Fuel Oils | Other Deferred Credits And Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 6 | 3 |
Natural Gas | Other Current Assets | ||
Derivative [Line Items] | ||
Derivative assets | 12 | 3 |
Natural Gas | Other Assets | ||
Derivative [Line Items] | ||
Derivative assets | 6 | 1 |
Natural Gas | Other Current Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 2 | 13 |
Natural Gas | Other Deferred Credits And Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 1 | 7 |
Power | Other Current Assets | ||
Derivative [Line Items] | ||
Derivative assets | 12 | 14 |
Power | Other Assets | ||
Derivative [Line Items] | ||
Derivative assets | 1 | 2 |
Power | Other Current Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 22 | 19 |
Power | Other Deferred Credits And Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 201 | 208 |
Uranium | Other Deferred Credits And Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 0 | 1 |
Union Electric Company | ||
Derivative [Line Items] | ||
Derivative assets | 19 | 22 |
Derivative liabilities | 30 | 13 |
Union Electric Company | Fuel Oils | Other Current Assets | ||
Derivative [Line Items] | ||
Derivative assets | 2 | 4 |
Union Electric Company | Fuel Oils | Other Assets | ||
Derivative [Line Items] | ||
Derivative assets | 0 | 2 |
Union Electric Company | Fuel Oils | Other Current Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 14 | 4 |
Union Electric Company | Fuel Oils | Other Deferred Credits And Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 6 | 3 |
Union Electric Company | Natural Gas | Other Current Assets | ||
Derivative [Line Items] | ||
Derivative assets | 2 | 0 |
Union Electric Company | Natural Gas | Other Assets | ||
Derivative [Line Items] | ||
Derivative assets | 2 | 0 |
Union Electric Company | Natural Gas | Other Current Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 0 | 1 |
Union Electric Company | Natural Gas | Other Deferred Credits And Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 0 | 1 |
Union Electric Company | Power | Other Current Assets | ||
Derivative [Line Items] | ||
Derivative assets | 12 | 14 |
Union Electric Company | Power | Other Assets | ||
Derivative [Line Items] | ||
Derivative assets | 1 | 2 |
Union Electric Company | Power | Other Current Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 6 | 2 |
Union Electric Company | Power | Other Deferred Credits And Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 4 | 1 |
Union Electric Company | Uranium | Other Deferred Credits And Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 0 | 1 |
Ameren Illinois Company | ||
Derivative [Line Items] | ||
Derivative assets | 14 | 4 |
Derivative liabilities | 216 | 242 |
Ameren Illinois Company | Fuel Oils | Other Current Assets | ||
Derivative [Line Items] | ||
Derivative assets | 0 | 0 |
Ameren Illinois Company | Fuel Oils | Other Assets | ||
Derivative [Line Items] | ||
Derivative assets | 0 | 0 |
Ameren Illinois Company | Fuel Oils | Other Current Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 0 | 0 |
Ameren Illinois Company | Fuel Oils | Other Deferred Credits And Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 0 | 0 |
Ameren Illinois Company | Natural Gas | Other Current Assets | ||
Derivative [Line Items] | ||
Derivative assets | 10 | 3 |
Ameren Illinois Company | Natural Gas | Other Assets | ||
Derivative [Line Items] | ||
Derivative assets | 4 | 1 |
Ameren Illinois Company | Natural Gas | Other Current Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 2 | 12 |
Ameren Illinois Company | Natural Gas | Other Deferred Credits And Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 1 | 6 |
Ameren Illinois Company | Power | Other Current Assets | ||
Derivative [Line Items] | ||
Derivative assets | 0 | 0 |
Ameren Illinois Company | Power | Other Assets | ||
Derivative [Line Items] | ||
Derivative assets | 0 | 0 |
Ameren Illinois Company | Power | Other Current Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 16 | 17 |
Ameren Illinois Company | Power | Other Deferred Credits And Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | 197 | 207 |
Ameren Illinois Company | Uranium | Other Deferred Credits And Liabilities | ||
Derivative [Line Items] | ||
Derivative liabilities | $ 0 | $ 0 |
Fair Value Measurements (Schedu
Fair Value Measurements (Schedule Of Fair Value Hierarchy Of Assets And Liabilities Measured At Fair Value On Recurring Basis) (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | $ 898 | $ 842 |
Assets fair value | 931 | 868 |
Excluded receivables, payables, and accrued income, net | 6 | 5 |
Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 604 | 569 |
Assets fair value | 605 | 569 |
Significant Other Observable Inputs (Level 2) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 294 | 273 |
Assets fair value | 307 | 276 |
Level 3 | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 0 | 0 |
Assets fair value | 19 | 23 |
Commodity Contract | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 33 | 26 |
Derivative liabilities | 246 | 255 |
Commodity Contract | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 1 | 0 |
Derivative liabilities | 21 | 4 |
Commodity Contract | Significant Other Observable Inputs (Level 2) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 13 | 3 |
Derivative liabilities | 2 | 16 |
Commodity Contract | Level 3 | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 19 | 23 |
Derivative liabilities | 223 | 235 |
Union Electric Company | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 898 | 842 |
Assets fair value | 917 | 864 |
Union Electric Company | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 604 | 569 |
Assets fair value | 605 | 569 |
Union Electric Company | Significant Other Observable Inputs (Level 2) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 294 | 273 |
Assets fair value | 298 | 275 |
Union Electric Company | Level 3 | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 0 | 0 |
Assets fair value | 14 | 20 |
Union Electric Company | Commodity Contract | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 19 | 22 |
Derivative liabilities | 30 | 13 |
Union Electric Company | Commodity Contract | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 1 | 0 |
Derivative liabilities | 21 | 1 |
Union Electric Company | Commodity Contract | Significant Other Observable Inputs (Level 2) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 4 | 2 |
Derivative liabilities | 0 | 4 |
Union Electric Company | Commodity Contract | Level 3 | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 14 | 20 |
Derivative liabilities | 9 | 8 |
Union Electric Company | Fuel Oils | Commodity Contract | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 2 | 6 |
Derivative liabilities | 20 | 7 |
Union Electric Company | Fuel Oils | Commodity Contract | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 0 | 0 |
Derivative liabilities | 13 | 1 |
Union Electric Company | Fuel Oils | Commodity Contract | Significant Other Observable Inputs (Level 2) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 0 | 0 |
Derivative liabilities | 0 | 0 |
Union Electric Company | Fuel Oils | Commodity Contract | Level 3 | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 2 | 6 |
Derivative liabilities | 7 | 6 |
Union Electric Company | Natural Gas | Commodity Contract | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 4 | 0 |
Derivative liabilities | 0 | 2 |
Union Electric Company | Natural Gas | Commodity Contract | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 0 | 0 |
Derivative liabilities | 0 | 0 |
Union Electric Company | Natural Gas | Commodity Contract | Significant Other Observable Inputs (Level 2) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 4 | 0 |
Derivative liabilities | 0 | 2 |
Union Electric Company | Natural Gas | Commodity Contract | Level 3 | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 0 | 0 |
Derivative liabilities | 0 | 0 |
Union Electric Company | Power | Commodity Contract | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 13 | 16 |
Derivative liabilities | 10 | 3 |
Union Electric Company | Power | Commodity Contract | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 1 | 0 |
Derivative liabilities | 8 | 0 |
Union Electric Company | Power | Commodity Contract | Significant Other Observable Inputs (Level 2) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 0 | 2 |
Derivative liabilities | 0 | 2 |
Union Electric Company | Power | Commodity Contract | Level 3 | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 12 | 14 |
Derivative liabilities | 2 | 1 |
Union Electric Company | Uranium | Commodity Contract | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative liabilities | 0 | 1 |
Union Electric Company | Uranium | Commodity Contract | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative liabilities | 0 | 0 |
Union Electric Company | Uranium | Commodity Contract | Significant Other Observable Inputs (Level 2) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative liabilities | 0 | 0 |
Union Electric Company | Uranium | Commodity Contract | Level 3 | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative liabilities | 0 | 1 |
Union Electric Company | Equity Securities | U.S. large capitalization | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 604 | 569 |
Union Electric Company | Equity Securities | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | U.S. large capitalization | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 604 | 569 |
Union Electric Company | Equity Securities | Significant Other Observable Inputs (Level 2) | U.S. large capitalization | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 0 | 0 |
Union Electric Company | Equity Securities | Level 3 | U.S. large capitalization | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 0 | 0 |
Union Electric Company | Debt Securities | US treasury and government securities | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 112 | 107 |
Union Electric Company | Debt Securities | Corporate bonds | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 116 | 93 |
Union Electric Company | Debt Securities | Other Debt Securities | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 66 | 73 |
Union Electric Company | Debt Securities | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | US treasury and government securities | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 0 | 0 |
Union Electric Company | Debt Securities | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | Corporate bonds | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 0 | 0 |
Union Electric Company | Debt Securities | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | Other Debt Securities | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 0 | 0 |
Union Electric Company | Debt Securities | Significant Other Observable Inputs (Level 2) | US treasury and government securities | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 112 | 107 |
Union Electric Company | Debt Securities | Significant Other Observable Inputs (Level 2) | Corporate bonds | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 116 | 93 |
Union Electric Company | Debt Securities | Significant Other Observable Inputs (Level 2) | Other Debt Securities | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 66 | 73 |
Union Electric Company | Debt Securities | Level 3 | US treasury and government securities | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 0 | 0 |
Union Electric Company | Debt Securities | Level 3 | Corporate bonds | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 0 | 0 |
Union Electric Company | Debt Securities | Level 3 | Other Debt Securities | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Nuclear Decommissioning Trust Fund | 0 | 0 |
Ameren Illinois Company | Commodity Contract | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative liabilities | 216 | 242 |
Ameren Illinois Company | Commodity Contract | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative liabilities | 0 | 3 |
Ameren Illinois Company | Commodity Contract | Significant Other Observable Inputs (Level 2) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative liabilities | 2 | 12 |
Ameren Illinois Company | Commodity Contract | Level 3 | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative liabilities | 214 | 227 |
Ameren Illinois Company | Natural Gas | Commodity Contract | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 14 | 4 |
Derivative liabilities | 3 | 18 |
Ameren Illinois Company | Natural Gas | Commodity Contract | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 0 | 0 |
Derivative liabilities | 0 | 3 |
Ameren Illinois Company | Natural Gas | Commodity Contract | Significant Other Observable Inputs (Level 2) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 9 | 1 |
Derivative liabilities | 2 | 12 |
Ameren Illinois Company | Natural Gas | Commodity Contract | Level 3 | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative assets | 5 | 3 |
Derivative liabilities | 1 | 3 |
Ameren Illinois Company | Power | Commodity Contract | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative liabilities | 213 | 224 |
Ameren Illinois Company | Power | Commodity Contract | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative liabilities | 0 | 0 |
Ameren Illinois Company | Power | Commodity Contract | Significant Other Observable Inputs (Level 2) | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative liabilities | 0 | 0 |
Ameren Illinois Company | Power | Commodity Contract | Level 3 | ||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||
Derivative liabilities | $ 213 | $ 224 |
Fair Value Measurements (Sche_2
Fair Value Measurements (Schedule Of Changes In The Fair Value Of Financial Assets And Liabilities Classified As Level Three In The Fair Value Hierarchy) (Detail) - Power - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | ||||||
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||||||||
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | $ (203) | $ (196) | $ (203) | $ (196) | $ (213) | $ (211) | $ (176) | $ (183) |
Included in regulatory assets/liabilities | 10 | (21) | 16 | (20) | ||||
Settlements, assets | 3 | 9 | ||||||
Settlement, liabilities | 0 | (8) | ||||||
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 | 0 | (2) | 0 | (2) | ||||
Change in unrealized gains (losses) related to assets/liabilities held at period end | 9 | (21) | 5 | (23) | ||||
Union Electric Company | ||||||||
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||||||||
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | 10 | 8 | 10 | 8 | 16 | 13 | 15 | 0 |
Included in regulatory assets/liabilities | (2) | (4) | 18 | 12 | ||||
Settlement, liabilities | (4) | (1) | (21) | (2) | ||||
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3 | 0 | (2) | 0 | (2) | ||||
Change in unrealized gains (losses) related to assets/liabilities held at period end | (2) | (4) | 6 | 8 | ||||
Ameren Illinois Company | ||||||||
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] | ||||||||
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis with Unobservable Inputs | (213) | (204) | (213) | (204) | $ (229) | $ (224) | $ (191) | $ (183) |
Included in regulatory assets/liabilities | 12 | (17) | (2) | (32) | ||||
Settlements, assets | 4 | 4 | 13 | 11 | ||||
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 0 | 0 | 0 | 0 | ||||
Change in unrealized gains (losses) related to assets/liabilities held at period end | $ 11 | $ (17) | $ (1) | $ (31) |
Fair Value Measurements (Sche_3
Fair Value Measurements (Schedule Of Valuation Process And Unobservable Inputs) (Detail) - Power $ in Millions | Sep. 30, 2020USD ($)$ / MWh$ / MMBTU | Dec. 31, 2019USD ($)$ / MWh$ / MMBTU |
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
Derivative assets | $ | $ 12 | $ 14 |
Derivative liabilities | $ | $ (215) | $ (225) |
Commodity Forward Price | Discounted Cash Flow | Minimum | ||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
Measurement input | 20 | 22 |
Commodity Forward Price | Discounted Cash Flow | Maximum | ||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
Measurement input | 36 | 34 |
Commodity Forward Price | Discounted Cash Flow | Weighted Average | ||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
Measurement input | 28 | 25 |
Nodal Basis | Discounted Cash Flow | Minimum | ||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
Measurement input | (5) | (6) |
Nodal Basis | Discounted Cash Flow | Maximum | ||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
Measurement input | 1 | 0 |
Nodal Basis | Discounted Cash Flow | Weighted Average | ||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
Measurement input | (2) | (2) |
Commodity Future Price | Discounted Cash Flow | Minimum | ||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
Measurement input | $ / MMBTU | 3 | (1) |
Commodity Future Price | Discounted Cash Flow | Maximum | ||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
Measurement input | $ / MMBTU | 4 | 0 |
Commodity Future Price | Discounted Cash Flow | Weighted Average | ||
Fair Value Inputs, Assets and Liabilities, Quantitative Information [Line Items] | ||
Measurement input | $ / MMBTU | 3 | 0 |
Fair Value Measurements (Sche_4
Fair Value Measurements (Schedule Of Carrying Amounts And Estimated Fair Values Of Financial Assets and Liabilities) (Detail) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | $ 168 | $ 176 | $ 155 | $ 107 |
Short-term debt | 272 | 440 | ||
Union Electric Company | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 10 | 39 | 14 | 8 |
Advances to money pool | 5 | 0 | ||
Short-term debt | 0 | 234 | ||
Ameren Illinois Company | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 147 | 125 | $ 117 | $ 80 |
Short-term debt | 242 | 53 | ||
Carrying Amount | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 168 | 176 | ||
Available-for-sale Securities and Held-to-maturity Securities | 263 | 263 | ||
Short-term debt | 272 | 440 | ||
Long-term debt (including current portion) | 10,529 | 9,357 | ||
Debt Issuance Costs, Net | 77 | 72 | ||
Carrying Amount | Union Electric Company | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 10 | 39 | ||
Advances to money pool | 5 | |||
Available-for-sale Securities and Held-to-maturity Securities | 263 | 263 | ||
Short-term debt | 234 | |||
Long-term debt (including current portion) | 4,568 | 4,190 | ||
Debt Issuance Costs, Net | 32 | 30 | ||
Carrying Amount | Ameren Illinois Company | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 147 | 125 | ||
Short-term debt | 242 | 53 | ||
Long-term debt (including current portion) | 3,576 | 3,575 | ||
Debt Issuance Costs, Net | 33 | 34 | ||
Fair Value | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 168 | 176 | ||
Investments, Fair Value Disclosure | 263 | 263 | ||
Short-term Debt, Fair Value | 272 | 440 | ||
Long-term Debt, Fair Value | 12,412 | 10,441 | ||
Fair Value | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 168 | 176 | ||
Investments, Fair Value Disclosure | 0 | 0 | ||
Short-term Debt, Fair Value | 0 | 0 | ||
Long-term Debt, Fair Value | 0 | 0 | ||
Fair Value | Significant Other Observable Inputs (Level 2) | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 0 | 0 | ||
Investments, Fair Value Disclosure | 263 | 263 | ||
Short-term Debt, Fair Value | 272 | 440 | ||
Long-term Debt, Fair Value | 11,891 | 9,957 | ||
Fair Value | Level 3 | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 0 | 0 | ||
Investments, Fair Value Disclosure | 0 | 0 | ||
Short-term Debt, Fair Value | 0 | 0 | ||
Long-term Debt, Fair Value | 521 | 484 | ||
Fair Value | Union Electric Company | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 10 | 39 | ||
Advances to money pool | 5 | |||
Investments, Fair Value Disclosure | 263 | 263 | ||
Short-term Debt, Fair Value | 234 | |||
Long-term Debt, Fair Value | 5,316 | 4,772 | ||
Fair Value | Union Electric Company | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 10 | 39 | ||
Advances to money pool | 0 | |||
Investments, Fair Value Disclosure | 0 | 0 | ||
Short-term Debt, Fair Value | 0 | |||
Long-term Debt, Fair Value | 0 | 0 | ||
Fair Value | Union Electric Company | Significant Other Observable Inputs (Level 2) | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 0 | 0 | ||
Advances to money pool | 5 | |||
Investments, Fair Value Disclosure | 263 | 263 | ||
Short-term Debt, Fair Value | 234 | |||
Long-term Debt, Fair Value | 5,316 | 4,772 | ||
Fair Value | Union Electric Company | Level 3 | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 0 | 0 | ||
Advances to money pool | 0 | |||
Investments, Fair Value Disclosure | 0 | 0 | ||
Short-term Debt, Fair Value | 0 | |||
Long-term Debt, Fair Value | 0 | 0 | ||
Fair Value | Ameren Illinois Company | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 147 | 125 | ||
Short-term Debt, Fair Value | 242 | 53 | ||
Long-term Debt, Fair Value | 4,431 | 4,019 | ||
Fair Value | Ameren Illinois Company | Quoted Prices In Active Markets For Identical Assets or Liabilities (Level 1) | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 147 | 125 | ||
Short-term Debt, Fair Value | 0 | 0 | ||
Long-term Debt, Fair Value | 0 | 0 | ||
Fair Value | Ameren Illinois Company | Significant Other Observable Inputs (Level 2) | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 0 | 0 | ||
Short-term Debt, Fair Value | 242 | 53 | ||
Long-term Debt, Fair Value | 4,431 | 4,019 | ||
Fair Value | Ameren Illinois Company | Level 3 | ||||
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] | ||||
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents | 0 | 0 | ||
Short-term Debt, Fair Value | 0 | 0 | ||
Long-term Debt, Fair Value | $ 0 | $ 0 |
Related Party Transactions (Nar
Related Party Transactions (Narrative) (Details) - Ameren Illinois Company $ in Millions | 1 Months Ended | 9 Months Ended | |
Sep. 30, 2020USD ($) | Apr. 30, 2020USD ($) | Sep. 30, 2020MWh$ / MWh | |
April 2020 Procurement | Ameren Illinois Capacity Supply Agreements with Ameren Missouri | |||
Related Party Transaction [Line Items] | |||
Energy Supply Agreements Amount | $ 2 | ||
September 2020 Procurement | Ameren Illinois Capacity Supply Agreements with Ameren Missouri | |||
Related Party Transaction [Line Items] | |||
Energy Supply Agreements Amount | $ 1 | ||
September 2020 Procurement | Ameren Illinois Power Supply Agreements with Ameren Missouri | |||
Related Party Transaction [Line Items] | |||
Related Party Long Term Contract For Purchase of Electric Power | MWh | 204,800 | ||
Related Party Long Term Contract For Purchase of Electric Power Rate | $ / MWh | 31 |
Related Party Transactions (Sch
Related Party Transactions (Schedule of Affiliate Receivables and Payables) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 |
Union Electric Company | ||
Related Party Transaction [Line Items] | ||
Accounts Payable, Related Parties, Current | $ 70 | $ 52 |
Accounts Receivable, Related Parties, Current | 12 | 30 |
Union Electric Company | Income taxes payable to parent | ||
Related Party Transaction [Line Items] | ||
Accounts Payable, Related Parties, Current | 38 | 15 |
Union Electric Company | Income taxes receivable from parent | ||
Related Party Transaction [Line Items] | ||
Accounts Receivable, Related Parties, Current | 0 | 15 |
Ameren Illinois Company | ||
Related Party Transaction [Line Items] | ||
Accounts Payable, Related Parties, Current | 43 | 82 |
Accounts Receivable, Related Parties, Current | 15 | 28 |
Ameren Illinois Company | Income taxes payable to parent | ||
Related Party Transaction [Line Items] | ||
Accounts Payable, Related Parties, Current | 9 | 43 |
Ameren Illinois Company | Income taxes receivable from parent | ||
Related Party Transaction [Line Items] | ||
Accounts Receivable, Related Parties, Current | $ 6 | $ 17 |
Related Party Transactions (Eff
Related Party Transactions (Effects of Related-party Transactions on the Statement of Income) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | |
Union Electric Company | Ameren Missouri Power Supply Agreements with Ameren Illinois | ||||
Related Party Transaction [Line Items] | ||||
Operating Revenues | $ 5 | $ 1 | $ 11 | $ 3 |
Union Electric Company | Ameren Missouri and Ameren Illinois Rent and Facility Services | ||||
Related Party Transaction [Line Items] | ||||
Operating Revenues | 6 | 7 | 19 | 20 |
Operating Expenses | 1 | 1 | 1 | 1 |
Union Electric Company | Ameren Missouri and Ameren Illinois Miscellaneous Support Services | ||||
Related Party Transaction [Line Items] | ||||
Operating Revenues | 1 | 1 | 1 | 1 |
Union Electric Company | Total Related Party Operating Revenues | ||||
Related Party Transaction [Line Items] | ||||
Operating Revenues | 11 | 9 | 31 | 24 |
Union Electric Company | Ameren Services Support Services Agreement | ||||
Related Party Transaction [Line Items] | ||||
Operating Expenses | 36 | 34 | 103 | 98 |
Union Electric Company | Total Related Party Other Operations and Maintenance | ||||
Related Party Transaction [Line Items] | ||||
Operating Expenses | 36 | 34 | 103 | 99 |
Union Electric Company | Money pool borrowings (advances) | ||||
Related Party Transaction [Line Items] | ||||
Interest Charges (Income) | 1 | 1 | 1 | 1 |
Ameren Illinois Company | Ameren Missouri and Ameren Illinois Rent and Facility Services | ||||
Related Party Transaction [Line Items] | ||||
Operating Revenues | 1 | 1 | 1 | 2 |
Operating Expenses | 1 | 1 | 3 | 4 |
Ameren Illinois Company | Ameren Missouri and Ameren Illinois Miscellaneous Support Services | ||||
Related Party Transaction [Line Items] | ||||
Operating Revenues | 1 | 1 | 1 | 1 |
Ameren Illinois Company | Ameren Missouri Software Licensing with Ameren Illinois | ||||
Related Party Transaction [Line Items] | ||||
Operating Revenues | 19 | 19 | ||
Related Party Transaction, Amounts of Transaction | 24 | |||
Capitalized Computer Software, Net | 5 | 5 | ||
Ameren Illinois Company | Total Related Party Operating Revenues | ||||
Related Party Transaction [Line Items] | ||||
Operating Revenues | 1 | 20 | 2 | 22 |
Ameren Illinois Company | Ameren Illinois Power Supply Agreements with Ameren Missouri | ||||
Related Party Transaction [Line Items] | ||||
Operating Expenses | 5 | 1 | 11 | 3 |
Ameren Illinois Company | Ameren Illinois Transmission Services With ATXI | ||||
Related Party Transaction [Line Items] | ||||
Operating Expenses | 1 | 1 | 1 | 1 |
Ameren Illinois Company | Purchased Power | ||||
Related Party Transaction [Line Items] | ||||
Operating Expenses | 5 | 2 | 12 | 4 |
Ameren Illinois Company | Ameren Services Support Services Agreement | ||||
Related Party Transaction [Line Items] | ||||
Operating Expenses | 34 | 30 | 98 | 91 |
Ameren Illinois Company | Total Related Party Other Operations and Maintenance | ||||
Related Party Transaction [Line Items] | ||||
Operating Expenses | 35 | 31 | 101 | 95 |
Ameren Illinois Company | Money pool borrowings (advances) | ||||
Related Party Transaction [Line Items] | ||||
Interest Charges (Income) | $ 1 | 1 | $ 1 | $ 1 |
Ameren Illinois Electric Distribution | Ameren Missouri Software Licensing with Ameren Illinois | ||||
Related Party Transaction [Line Items] | ||||
Operating Revenues | 14 | |||
Ameren Illinois Natural Gas | Ameren Missouri Software Licensing with Ameren Illinois | ||||
Related Party Transaction [Line Items] | ||||
Operating Revenues | $ 5 |
Commitments And Contingencies_2
Commitments And Contingencies (Other Obligations) (Detail) $ in Millions | 9 Months Ended |
Sep. 30, 2020USD ($)MWh | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | $ 245 |
2021 | 672 |
2022 | 402 |
2023 | 274 |
2024 | 169 |
Thereafter | 231 |
Total unrecorded unconditional purchase obligation | 1,993 |
Coal | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 94 |
2021 | 242 |
2022 | 193 |
2023 | 113 |
2024 | 94 |
Thereafter | 55 |
Total unrecorded unconditional purchase obligation | 791 |
Natural Gas | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 52 |
2021 | 161 |
2022 | 108 |
2023 | 69 |
2024 | 28 |
Thereafter | 73 |
Total unrecorded unconditional purchase obligation | 491 |
Nuclear Fuel | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 3 |
2021 | 57 |
2022 | 12 |
2023 | 45 |
2024 | 20 |
Thereafter | 21 |
Total unrecorded unconditional purchase obligation | 158 |
Purchased Power | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 57 |
2021 | 156 |
2022 | 63 |
2023 | 21 |
2024 | 4 |
Thereafter | 0 |
Total unrecorded unconditional purchase obligation | $ 301 |
Amount of Megawatts | MWh | 102 |
Methane Gas | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | $ 0 |
2021 | 3 |
2022 | 3 |
2023 | 3 |
2024 | 3 |
Thereafter | 21 |
Total unrecorded unconditional purchase obligation | 33 |
Other | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 39 |
2021 | 53 |
2022 | 23 |
2023 | 23 |
2024 | 20 |
Thereafter | 61 |
Total unrecorded unconditional purchase obligation | 219 |
Renewable Energy Credits | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
Total unrecorded unconditional purchase obligation | 36 |
Zero Emission Credits | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
Total unrecorded unconditional purchase obligation | 42 |
Union Electric Company | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 131 |
2021 | 391 |
2022 | 269 |
2023 | 216 |
2024 | 150 |
Thereafter | 143 |
Total unrecorded unconditional purchase obligation | 1,300 |
Union Electric Company | Coal | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 94 |
2021 | 242 |
2022 | 193 |
2023 | 113 |
2024 | 94 |
Thereafter | 55 |
Total unrecorded unconditional purchase obligation | 791 |
Union Electric Company | Natural Gas | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 12 |
2021 | 43 |
2022 | 38 |
2023 | 32 |
2024 | 13 |
Thereafter | 22 |
Total unrecorded unconditional purchase obligation | 160 |
Union Electric Company | Nuclear Fuel | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 3 |
2021 | 57 |
2022 | 12 |
2023 | 45 |
2024 | 20 |
Thereafter | 21 |
Total unrecorded unconditional purchase obligation | 158 |
Union Electric Company | Purchased Power | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 0 |
2021 | 0 |
2022 | 0 |
2023 | 0 |
2024 | 0 |
Thereafter | 0 |
Total unrecorded unconditional purchase obligation | $ 0 |
Amount of Megawatts | MWh | 102 |
Union Electric Company | Methane Gas | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | $ 0 |
2021 | 3 |
2022 | 3 |
2023 | 3 |
2024 | 3 |
Thereafter | 21 |
Total unrecorded unconditional purchase obligation | 33 |
Union Electric Company | Other | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 22 |
2021 | 46 |
2022 | 23 |
2023 | 23 |
2024 | 20 |
Thereafter | 24 |
Total unrecorded unconditional purchase obligation | 158 |
Ameren Illinois Company | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 111 |
2021 | 276 |
2022 | 133 |
2023 | 58 |
2024 | 19 |
Thereafter | 51 |
Total unrecorded unconditional purchase obligation | 648 |
Ameren Illinois Company | Coal | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 0 |
2021 | 0 |
2022 | 0 |
2023 | 0 |
2024 | 0 |
Thereafter | 0 |
Total unrecorded unconditional purchase obligation | 0 |
Ameren Illinois Company | Natural Gas | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 40 |
2021 | 118 |
2022 | 70 |
2023 | 37 |
2024 | 15 |
Thereafter | 51 |
Total unrecorded unconditional purchase obligation | 331 |
Ameren Illinois Company | Nuclear Fuel | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 0 |
2021 | 0 |
2022 | 0 |
2023 | 0 |
2024 | 0 |
Thereafter | 0 |
Total unrecorded unconditional purchase obligation | 0 |
Ameren Illinois Company | Purchased Power | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 57 |
2021 | 156 |
2022 | 63 |
2023 | 21 |
2024 | 4 |
Thereafter | 0 |
Total unrecorded unconditional purchase obligation | 301 |
Ameren Illinois Company | Methane Gas | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 0 |
2021 | 0 |
2022 | 0 |
2023 | 0 |
2024 | 0 |
Thereafter | 0 |
Total unrecorded unconditional purchase obligation | 0 |
Ameren Illinois Company | Other | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
2020 | 14 |
2021 | 2 |
2022 | 0 |
2023 | 0 |
2024 | 0 |
Thereafter | 0 |
Total unrecorded unconditional purchase obligation | 16 |
Ameren Illinois Company | Renewable Energy Credits | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
Total unrecorded unconditional purchase obligation | 36 |
Ameren Illinois Company | Zero Emission Credits | |
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity [Abstract] | |
Total unrecorded unconditional purchase obligation | $ 42 |
Commitments And Contingencies_3
Commitments And Contingencies (Environmental Matters) (Detail) $ in Millions | Sep. 30, 2020USD ($)centerscrubbersite | Dec. 31, 2019USD ($) |
Loss Contingencies [Line Items] | ||
Asset Retirement Obligation | $ 728 | $ 691 |
Minimum | ||
Loss Contingencies [Line Items] | ||
Estimated capital costs to comply with existing and known federal and state air emissions regulations | 200 | |
Maximum | ||
Loss Contingencies [Line Items] | ||
Estimated capital costs to comply with existing and known federal and state air emissions regulations | $ 250 | |
Union Electric Company | ||
Loss Contingencies [Line Items] | ||
Number of Energy Center Scrubbers | scrubber | 2 | |
Number of Energy Centers Constructing Wastewater Treatment Facilities | center | 3 | |
Number of Energy Centers Closing Surface Impoundments | center | 3 | |
Asset Retirement Obligation | $ 723 | 687 |
Number of energy centers | center | 4 | |
Union Electric Company | Minimum | ||
Loss Contingencies [Line Items] | ||
Estimated capital costs to comply with existing and known federal and state air emissions regulations | $ 200 | |
Union Electric Company | Maximum | ||
Loss Contingencies [Line Items] | ||
Estimated capital costs to comply with existing and known federal and state air emissions regulations | 250 | |
Ameren Illinois Company | ||
Loss Contingencies [Line Items] | ||
Asset Retirement Obligation | 5 | $ 4 |
Coal Combustion Residuals Estimate | Union Electric Company | Minimum | ||
Loss Contingencies [Line Items] | ||
Estimated capital costs to comply with existing and known federal and state air emissions regulations | 75 | |
Coal Combustion Residuals Estimate | Union Electric Company | Maximum | ||
Loss Contingencies [Line Items] | ||
Estimated capital costs to comply with existing and known federal and state air emissions regulations | 125 | |
Manufactured Gas Plant | ||
Loss Contingencies [Line Items] | ||
Accrual for environmental loss contingencies | $ 106 | |
Manufactured Gas Plant | Ameren Illinois Company | ||
Loss Contingencies [Line Items] | ||
Number of remediation sites | site | 44 | |
Accrual for environmental loss contingencies | $ 106 | |
Manufactured Gas Plant | Ameren Illinois Company | Minimum | ||
Loss Contingencies [Line Items] | ||
Estimate of possible loss | 106 | |
Manufactured Gas Plant | Ameren Illinois Company | Maximum | ||
Loss Contingencies [Line Items] | ||
Estimate of possible loss | 178 | |
Rush Island Energy Center | Union Electric Company | ||
Loss Contingencies [Line Items] | ||
Estimated capital costs to comply with preliminary court order | 1,000 | |
Rush Island Energy Center | Union Electric Company | Minimum | ||
Loss Contingencies [Line Items] | ||
Estimated operations and maintenance costs to comply with preliminary court order | 30 | |
Rush Island Energy Center | Union Electric Company | Maximum | ||
Loss Contingencies [Line Items] | ||
Estimated operations and maintenance costs to comply with preliminary court order | 50 | |
New CCR Rules Estimate | ||
Loss Contingencies [Line Items] | ||
Asset Retirement Obligation | 125 | |
New CCR Rules Estimate | Union Electric Company | ||
Loss Contingencies [Line Items] | ||
Asset Retirement Obligation | $ 125 |
Callaway Energy Center (Insuran
Callaway Energy Center (Insurance Disclosure) (Details) $ in Millions | 9 Months Ended |
Sep. 30, 2020USD ($) | |
Nuclear Waste Matters [Line Items] | |
Decommissioning Cost | $ 7 |
Frequency of Decommissioning Cost Study | 3 years |
Number Of Years The Limit Of Liability And The Maximum Potential Annual Payments Are Adjusted | 5 years |
Number Of Weeks Of Coverage After The First Twelve Weeks Of An Outage | 1 |
Number Of Additional Weeks After Initial Indemnity Coverage For Power Outage | 1.365 |
Public Liability And Nuclear Worker Liability - American Nuclear Insurers | |
Nuclear Waste Matters [Line Items] | |
Insurance Aggregate Maximum Coverage | $ 450 |
Insurance Maximum Coverage per Incident | 0 |
Public Liability And Nuclear Worker Liability - Pool Participation | |
Nuclear Waste Matters [Line Items] | |
Insurance Aggregate Maximum Coverage | 13,348 |
Insurance Maximum Coverage per Incident | 138 |
Threshold Amount For Retrospective Insurance Assessment For Covered Loss Under Public Liability And Nuclear Worker Liability Insurance Policy | 450 |
Maximum Annual Payment Per Incident At Licensed Commercial Nuclear Reactor | 21 |
Public Liability | |
Nuclear Waste Matters [Line Items] | |
Insurance Aggregate Maximum Coverage | 13,798 |
Insurance Maximum Coverage per Incident | 138 |
Property Damage - Nuclear Electric Insurance Ltd | |
Nuclear Waste Matters [Line Items] | |
Insurance Aggregate Maximum Coverage | 3,200 |
Insurance Maximum Coverage per Incident | 25 |
Replacement Power - Nuclear Electric Insurance Ltd | |
Nuclear Waste Matters [Line Items] | |
Insurance Aggregate Maximum Coverage | 490 |
Insurance Maximum Coverage per Incident | 7 |
Amount Of Weekly Indemnity Coverage Commencing Twelve Weeks After Power Outage | 4.5 |
Amount Of Additional Weekly Indemnity Coverage Commencing After Initial Indemnity Coverage | 3.6 |
Amount Of Weekly Indemnity Coverage Thereafter Not Exceeding Policy Limit | 490 |
Sub-Limit Of Amount Of Weekly Indemnity Coverage Thereafter Not Exceeding Policy Limit For Non-Nuclear Events | 328 |
Radiation Event | |
Nuclear Waste Matters [Line Items] | |
Insurance Aggregate Maximum Coverage | 2,700 |
Aggregate Nuclear Power Industry Insurance Policy Limit For Losses From Terrorist Attacks Within Twelve Month Period | 3,200 |
Non-Radiation Event | |
Nuclear Waste Matters [Line Items] | |
Insurance Aggregate Maximum Coverage | 2,300 |
Aggregate Nuclear Power Industry Insurance Policy Limit For Losses From Terrorist Attacks Within Twelve Month Period | 1,800 |
Property Damage European Mutual Association for Nuclear Insurance | |
Nuclear Waste Matters [Line Items] | |
Insurance Aggregate Maximum Coverage | $ 490 |
Retirement Benefits (Components
Retirement Benefits (Components Of Net Periodic Benefit Cost) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
Total non-service cost components | $ (32) | $ (23) | $ (85) | $ (67) |
Pension Plan | ||||
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
Service cost | 28 | 22 | 83 | 66 |
Interest cost | 43 | 46 | 130 | 139 |
Expected return on plan assets | (73) | (69) | (218) | (207) |
Prior service cost (benefit) | 0 | 0 | (1) | 0 |
Actuarial loss (gain) | 15 | 6 | 45 | 19 |
Total non-service cost components | (15) | (17) | (44) | (49) |
Net periodic benefit cost (income) | 13 | 5 | 39 | 17 |
Other Postretirement Benefit Plan, Defined Benefit | ||||
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
Service cost | 4 | 4 | 14 | 13 |
Interest cost | 10 | 11 | 29 | 32 |
Expected return on plan assets | (20) | (19) | (60) | (57) |
Prior service cost (benefit) | (1) | (1) | (3) | (4) |
Actuarial loss (gain) | (3) | (4) | (7) | (11) |
Total non-service cost components | (14) | (13) | (41) | (40) |
Net periodic benefit cost (income) | $ (10) | $ (9) | $ (27) | $ (27) |
Retirement Benefits (Summary of
Retirement Benefits (Summary of Benefit Plan Costs Incurred) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | |
Pension Plan | ||||
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
Net periodic benefit cost | $ 13 | $ 5 | $ 39 | $ 17 |
Pension Plan | Union Electric Company | ||||
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
Net periodic benefit cost | 5 | 1 | 16 | 3 |
Pension Plan | Ameren Illinois Company | ||||
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
Net periodic benefit cost | 8 | 5 | 24 | 15 |
Pension Plan | Other Affiliated Entities And Intercompany Eliminations | ||||
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
Net periodic benefit cost | 0 | (1) | (1) | (1) |
Other Postretirement Benefit Plan, Defined Benefit | ||||
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
Net periodic benefit cost | (10) | (9) | (27) | (27) |
Other Postretirement Benefit Plan, Defined Benefit | Union Electric Company | ||||
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
Net periodic benefit cost | (2) | (1) | (4) | (4) |
Other Postretirement Benefit Plan, Defined Benefit | Ameren Illinois Company | ||||
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
Net periodic benefit cost | (8) | (8) | (24) | (23) |
Other Postretirement Benefit Plan, Defined Benefit | Other Affiliated Entities And Intercompany Eliminations | ||||
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | ||||
Net periodic benefit cost | $ 0 | $ 0 | $ 1 | $ 0 |
Retirement Benefits (Narrative)
Retirement Benefits (Narrative) (Details) $ in Millions | Dec. 31, 2019USD ($) |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] | |
Defined benefit plan estimated future employer contributions over next five years | $ 70 |
Income Taxes Income Taxes (Sche
Income Taxes Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | |
Income Taxes [Line Items] | ||||
Federal statutory corporate income tax rate | 21.00% | 21.00% | 21.00% | 21.00% |
Amortization of deferred investment tax credit | (1.00%) | (1.00%) | 0.00% | (1.00%) |
Amortization of excess deferred taxes | (9.00%) | (7.00%) | (9.00%) | (7.00%) |
Depreciation differences | 0.00% | 0.00% | ||
Renewable and other tax credits | (1.00%) | 0.00% | (1.00%) | 0.00% |
State tax | 4.00% | 6.00% | 5.00% | 6.00% |
Stock-based compensation | 1.00% | 1.00% | (1.00%) | (1.00%) |
Effective income tax rate | 15.00% | 20.00% | 15.00% | 18.00% |
Union Electric Company | ||||
Income Taxes [Line Items] | ||||
Federal statutory corporate income tax rate | 21.00% | 21.00% | 21.00% | 21.00% |
Amortization of deferred investment tax credit | (1.00%) | (1.00%) | (1.00%) | (1.00%) |
Amortization of excess deferred taxes | (16.00%) | (11.00%) | (16.00%) | (12.00%) |
Depreciation differences | 0.00% | 0.00% | ||
Renewable and other tax credits | (2.00%) | 0.00% | (1.00%) | 0.00% |
State tax | 4.00% | 5.00% | 3.00% | 5.00% |
Stock-based compensation | 0.00% | 0.00% | 0.00% | 0.00% |
Effective income tax rate | 6.00% | 14.00% | 6.00% | 13.00% |
Ameren Illinois Company | ||||
Income Taxes [Line Items] | ||||
Federal statutory corporate income tax rate | 21.00% | 21.00% | 21.00% | 21.00% |
Amortization of deferred investment tax credit | 0.00% | 0.00% | 0.00% | 0.00% |
Amortization of excess deferred taxes | (3.00%) | (3.00%) | (3.00%) | (4.00%) |
Depreciation differences | (1.00%) | 0.00% | ||
Renewable and other tax credits | 0.00% | 0.00% | 0.00% | 0.00% |
State tax | 7.00% | 6.00% | 7.00% | 7.00% |
Stock-based compensation | 0.00% | 0.00% | 0.00% | 0.00% |
Effective income tax rate | 24.00% | 24.00% | 25.00% | 24.00% |
Supplemental Information (Narra
Supplemental Information (Narrative) (Details) - USD ($) $ in Millions | 9 Months Ended | ||
Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | |
Supplemental Information [Abstract] | |||
Payables for purchased receivables | $ 36 | $ 32 | |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Effective Income Tax Rate Reconciliation, Share-based Compensation, Excess Tax Benefit, Amount | 8 | $ 14 | |
Deferred Compensation Liability, Classified, Noncurrent | $ 88 | $ 86 | |
January 1, 2020 Issuance | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 38 months | ||
September 18, 2020 Issuance | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period | 3 years | ||
Performance Shares | January 1, 2020 Issuance | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Shares granted (in shares) | 294,320 | ||
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value | $ 24 | ||
Stock Issued During Period Percentage Conversion Of Units, Low End | 0.00% | ||
Stock Issued During Period Percentage Conversion Of Units, High End | 200.00% | ||
Performance Shares | Market performance measures achievement | January 1, 2020 Issuance | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Shares granted (in shares) | 252,370 | ||
Performance Shares | Renewable generation and energy storage installation targets | January 1, 2020 Issuance | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Shares granted (in shares) | 41,950 | ||
Restricted Stock Units (RSUs) | January 1, 2020 Issuance | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Shares granted (in shares) | 132,307 | ||
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value | $ 10 | ||
Restricted Stock Units (RSUs) | September 18, 2020 Issuance | |||
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
Shares granted (in shares) | 37,104 | ||
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Granted in Period, Fair Value | $ 3 |
Supplemental Information (Cash
Supplemental Information (Cash and Cash Equivalents) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Dec. 31, 2018 |
Schedule of Cash and Cash Equivalents Including Restricted Cash [Line Items] | ||||
Cash and cash equivalents | $ 6 | $ 16 | ||
Restricted cash included in “Other current assets” | 14 | 14 | ||
Restricted cash included in “Other assets” | 142 | 120 | ||
Restricted cash included in “Nuclear decommissioning trust fund” | 6 | 26 | ||
Total cash, cash equivalents, and restricted cash | 168 | 176 | $ 155 | $ 107 |
Union Electric Company | ||||
Schedule of Cash and Cash Equivalents Including Restricted Cash [Line Items] | ||||
Cash and cash equivalents | 0 | 9 | ||
Restricted cash included in “Other current assets” | 4 | 4 | ||
Restricted cash included in “Other assets” | 0 | 0 | ||
Restricted cash included in “Nuclear decommissioning trust fund” | 6 | 26 | ||
Total cash, cash equivalents, and restricted cash | 10 | 39 | 14 | 8 |
Ameren Illinois Company | ||||
Schedule of Cash and Cash Equivalents Including Restricted Cash [Line Items] | ||||
Cash and cash equivalents | 0 | 0 | ||
Restricted cash included in “Other current assets” | 5 | 5 | ||
Restricted cash included in “Other assets” | 142 | 120 | ||
Restricted cash included in “Nuclear decommissioning trust fund” | 0 | 0 | ||
Total cash, cash equivalents, and restricted cash | $ 147 | $ 125 | $ 117 | $ 80 |
Supplemental Information (Allow
Supplemental Information (Allowance for Doubtful Accounts) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | |
Allowance for Doubtful Accounts Receivable [Roll Forward] | ||||
Beginning of period | $ 25 | $ 19 | $ 17 | $ 18 |
Bad debt expense | 21 | 14 | 31 | 22 |
Net write-offs | (2) | (14) | (4) | (21) |
End of period | 44 | 19 | 44 | 19 |
Union Electric Company | ||||
Allowance for Doubtful Accounts Receivable [Roll Forward] | ||||
Beginning of period | 9 | 7 | 7 | 7 |
Bad debt expense | 5 | 3 | 9 | 6 |
Net write-offs | 0 | (2) | (2) | (5) |
End of period | 14 | 8 | 14 | 8 |
Ameren Illinois Company | ||||
Allowance for Doubtful Accounts Receivable [Roll Forward] | ||||
Beginning of period | 16 | 12 | 10 | 11 |
Bad debt expense | 16 | 11 | 22 | 16 |
Net write-offs | (2) | (12) | (2) | (16) |
End of period | $ 30 | $ 11 | $ 30 | $ 11 |
Supplemental Information (Suppl
Supplemental Information (Supplemental Cash Flow Information) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | |
Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | |
Supplemental Cash Flow Information [Line Items] | |||
Accrued capital expenditures | $ 311 | $ 273 | |
Net realized and unrealized gain (loss) – nuclear decommissioning trust fund | 43 | 100 | |
Issuance of common stock for stock-based compensation | $ 38 | 38 | 54 |
Debt Conversion, Original Debt, Amount | 0 | (17) | |
Union Electric Company | |||
Supplemental Cash Flow Information [Line Items] | |||
Accrued capital expenditures | 115 | 138 | |
Net realized and unrealized gain (loss) – nuclear decommissioning trust fund | 43 | 100 | |
Issuance of common stock for stock-based compensation | 0 | 0 | |
Debt Conversion, Original Debt, Amount | 0 | 0 | |
Ameren Illinois Company | |||
Supplemental Cash Flow Information [Line Items] | |||
Accrued capital expenditures | 191 | 128 | |
Net realized and unrealized gain (loss) – nuclear decommissioning trust fund | 0 | 0 | |
Issuance of common stock for stock-based compensation | 0 | 0 | |
Debt Conversion, Original Debt, Amount | $ 0 | $ (17) |
Supplemental Information (Sched
Supplemental Information (Schedule of Asset Retirement Obligations) (Details) - USD ($) $ in Millions | 9 Months Ended | |
Sep. 30, 2020 | Dec. 31, 2019 | |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ||
Asset Retirement Obligation, Beginning Balance | $ 691 | |
Liabilities settled | (42) | |
Accretion | 22 | |
Change in estimates | 57 | |
Asset Retirement Obligation, Ending Balance | 728 | |
Other current liabilities | 432 | $ 437 |
Union Electric Company | ||
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ||
Asset Retirement Obligation, Beginning Balance | 687 | |
Liabilities settled | (42) | |
Accretion | 21 | |
Change in estimates | 57 | |
Asset Retirement Obligation, Ending Balance | 723 | |
Other current liabilities | 102 | 96 |
Ameren Illinois Company | ||
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ||
Asset Retirement Obligation, Beginning Balance | 4 | |
Liabilities settled | 0 | |
Accretion | 1 | |
Change in estimates | 0 | |
Asset Retirement Obligation, Ending Balance | 5 | |
Other current liabilities | 234 | 249 |
Asset Retirement Obligation Balance | ||
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ||
Other current liabilities | 53 | 53 |
Asset Retirement Obligation Balance | Union Electric Company | ||
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] | ||
Other current liabilities | $ 53 | $ 53 |
Supplemental Information (Sch_2
Supplemental Information (Schedule Of Excise Taxes) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | |
Accounting Policies [Line Items] | ||||
Excise tax expense | $ 71 | $ 76 | $ 198 | $ 209 |
Union Electric Company | ||||
Accounting Policies [Line Items] | ||||
Excise tax expense | 45 | 49 | 111 | 118 |
Ameren Illinois Company | ||||
Accounting Policies [Line Items] | ||||
Excise tax expense | $ 26 | $ 27 | $ 87 | $ 91 |
Supplemental Information (Earni
Supplemental Information (Earnings Per Share) (Details) - shares | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | |
Earnings Per Share Reconciliation [Abstract] | ||||
Weighted-average Common Shares Outstanding – Basic | 247,100,000 | 245,900,000 | 246,800,000 | 245,500,000 |
Assumed settlement of performance share units and restricted stock units | 1,500,000 | 1,400,000 | 1,200,000 | 1,400,000 |
Dilutive effect of forward sale agreement | 600,000 | 200,000 | 400,000 | 100,000 |
Weighted-average Common Shares Outstanding – Diluted | 249,200,000 | 247,500,000 | 248,400,000 | 247,000,000 |
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) | 0 | 0 | 0 | 0 |
Segment Information (Schedule O
Segment Information (Schedule Of Segment Reporting Information By Segment) (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | |
Segment Reporting Information [Line Items] | ||||
External Revenues | $ 1,628 | $ 1,659 | $ 4,466 | $ 4,594 |
Net income (loss) attributable to common shareholders | 367 | 364 | 756 | 734 |
Capital expenditures | 656 | 636 | 1,884 | 1,761 |
Reportable Subsegments | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 1,628 | 1,640 | 4,466 | 4,575 |
Intersubsegment Eliminations | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | 0 | 19 | 0 | 19 |
Ameren Illinois Electric Distribution | Ameren Missouri Software Licensing with Ameren Illinois | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | 14 | 14 | ||
Ameren Illinois Natural Gas | Ameren Missouri Software Licensing with Ameren Illinois | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | 5 | 5 | ||
Ameren Illinois Company | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 589 | 564 | 1,879 | 1,873 |
Net income (loss) attributable to common shareholders | 77 | 65 | 280 | 247 |
Capital expenditures | 370 | 344 | 1,031 | 900 |
Ameren Illinois Company | Ameren Missouri Software Licensing with Ameren Illinois | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | 19 | 19 | ||
Ameren Illinois Company | Reportable Subsegments | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 589 | 564 | 1,879 | 1,873 |
Ameren Illinois Company | Intersubsegment Eliminations | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | 0 | 0 | 0 | 0 |
Operating Segments | Union Electric Company | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 1,001 | 1,059 | 2,473 | 2,615 |
Net income (loss) attributable to common shareholders | 297 | 300 | 439 | 446 |
Capital expenditures | 262 | 256 | 778 | 751 |
Operating Segments | Union Electric Company | Reportable Subsegments | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 990 | 1,050 | 2,442 | 2,591 |
Operating Segments | Union Electric Company | Intersubsegment Eliminations | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | 11 | 9 | 31 | 24 |
Operating Segments | Ameren Illinois Electric Distribution | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 391 | 389 | 1,133 | 1,135 |
Net income (loss) attributable to common shareholders | 34 | 32 | 107 | 105 |
Capital expenditures | 129 | 139 | 391 | 390 |
Operating Segments | Ameren Illinois Electric Distribution | Reportable Subsegments | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 390 | 374 | 1,131 | 1,118 |
Operating Segments | Ameren Illinois Electric Distribution | Intersubsegment Eliminations | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | 1 | 15 | 2 | 17 |
Operating Segments | Ameren Illinois Natural Gas | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 122 | 112 | 533 | 568 |
Net income (loss) attributable to common shareholders | 2 | (1) | 66 | 57 |
Capital expenditures | 81 | 113 | 221 | 241 |
Operating Segments | Ameren Illinois Natural Gas | Reportable Subsegments | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 122 | 107 | 533 | 563 |
Operating Segments | Ameren Illinois Natural Gas | Intersubsegment Eliminations | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | 0 | 5 | 0 | 5 |
Operating Segments | Ameren Transmission | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 141 | 128 | 400 | 351 |
Net income (loss) attributable to common shareholders | 62 | 53 | 168 | 139 |
Capital expenditures | 185 | 129 | 490 | 377 |
Operating Segments | Ameren Transmission | Reportable Subsegments | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 126 | 109 | 360 | 303 |
Operating Segments | Ameren Transmission | Intersubsegment Eliminations | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | 15 | 19 | 40 | 48 |
Operating Segments | Other | ||||
Segment Reporting Information [Line Items] | ||||
Net income (loss) attributable to common shareholders | (28) | (20) | (24) | (13) |
Capital expenditures | 2 | 4 | 3 | |
Capital expenditures, transfers | (7) | |||
Operating Segments | Other | Reportable Subsegments | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Other | Intersubsegment Eliminations | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | 0 | 0 | 0 | 0 |
Operating Segments | Ameren Illinois Company | Ameren Illinois Electric Distribution | ||||
Segment Reporting Information [Line Items] | ||||
Net income (loss) attributable to common shareholders | 34 | 32 | 107 | 105 |
Capital expenditures | 129 | 139 | 391 | 390 |
Operating Segments | Ameren Illinois Company | Ameren Illinois Electric Distribution | Reportable Subsegments | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 391 | 389 | 1,133 | 1,135 |
Operating Segments | Ameren Illinois Company | Ameren Illinois Electric Distribution | Intersubsegment Eliminations | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | 0 | 0 | 0 | 0 |
Operating Segments | Ameren Illinois Company | Ameren Illinois Natural Gas | ||||
Segment Reporting Information [Line Items] | ||||
Net income (loss) attributable to common shareholders | 2 | (1) | 66 | 57 |
Capital expenditures | 81 | 113 | 221 | 241 |
Operating Segments | Ameren Illinois Company | Ameren Illinois Natural Gas | Reportable Subsegments | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 122 | 112 | 533 | 568 |
Operating Segments | Ameren Illinois Company | Ameren Illinois Natural Gas | Intersubsegment Eliminations | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | 0 | 0 | 0 | 0 |
Operating Segments | Ameren Illinois Company | Ameren Illinois Transmission | ||||
Segment Reporting Information [Line Items] | ||||
Net income (loss) attributable to common shareholders | 41 | 34 | 107 | 85 |
Capital expenditures | 160 | 92 | 419 | 269 |
Operating Segments | Ameren Illinois Company | Ameren Illinois Transmission | Reportable Subsegments | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 76 | 63 | 213 | 170 |
Operating Segments | Ameren Illinois Company | Ameren Illinois Transmission | Intersubsegment Eliminations | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | 15 | 18 | 39 | 47 |
Intersegment Eliminations | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | (27) | (29) | (73) | (75) |
Net income (loss) attributable to common shareholders | 0 | 0 | 0 | 0 |
Capital expenditures | (3) | 6 | 0 | (1) |
Intersegment Eliminations | Reportable Subsegments | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Intersubsegment Eliminations | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | (27) | (29) | (73) | (75) |
Intersegment Eliminations | Ameren Illinois Company | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | (15) | (18) | (39) | (47) |
Net income (loss) attributable to common shareholders | 0 | 0 | 0 | 0 |
Capital expenditures | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Ameren Illinois Company | Reportable Subsegments | ||||
Segment Reporting Information [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Ameren Illinois Company | Intersubsegment Eliminations | ||||
Segment Reporting Information [Line Items] | ||||
Intersegment revenues | $ (15) | $ (18) | $ (39) | $ (47) |
Segment Information (Disaggrega
Segment Information (Disaggregation of Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | ||
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | |
Disaggregation of Revenue [Line Items] | ||||
External Revenues | $ 1,628 | $ 1,659 | $ 4,466 | $ 4,594 |
Revenues from alternative revenue programs | (102) | (130) | (16) | (93) |
Other revenues not from contracts with customers | 11 | 7 | 28 | 21 |
Ameren Illinois Electric Distribution | Ameren Missouri Software Licensing with Ameren Illinois | ||||
Disaggregation of Revenue [Line Items] | ||||
Intersegment revenues | 14 | 14 | ||
Ameren Illinois Natural Gas | Ameren Missouri Software Licensing with Ameren Illinois | ||||
Disaggregation of Revenue [Line Items] | ||||
Intersegment revenues | 5 | 5 | ||
Electricity | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 1,489 | 1,528 | 3,846 | 3,928 |
Electricity | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 689 | 713 | 1,775 | 1,774 |
Electricity | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 470 | 517 | 1,193 | 1,313 |
Electricity | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 113 | 121 | 298 | 320 |
Electricity | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 217 | 177 | 580 | 521 |
Natural Gas | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 139 | 131 | 620 | 666 |
Natural Gas | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 76 | 73 | 427 | 455 |
Natural Gas | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 21 | 21 | 114 | 129 |
Natural Gas | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 6 | 3 | 14 | 12 |
Natural Gas | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 36 | 34 | 65 | 70 |
Ameren Illinois Company | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 589 | 564 | 1,879 | 1,873 |
Revenues from alternative revenue programs | (102) | (156) | (13) | (135) |
Other revenues not from contracts with customers | 5 | 2 | 7 | 7 |
Ameren Illinois Company | Ameren Missouri Software Licensing with Ameren Illinois | ||||
Disaggregation of Revenue [Line Items] | ||||
Intersegment revenues | 19 | 19 | ||
Ameren Illinois Company | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 302 | 289 | 1,039 | 1,039 |
Ameren Illinois Company | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 145 | 140 | 459 | 475 |
Ameren Illinois Company | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 31 | 29 | 102 | 103 |
Ameren Illinois Company | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 111 | 106 | 279 | 256 |
Ameren Illinois Company | Electricity | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 467 | 452 | 1,346 | 1,305 |
Ameren Illinois Company | Natural Gas | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 122 | 112 | 533 | 568 |
Operating Segments | Union Electric Company | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 1,001 | 1,059 | 2,473 | 2,615 |
Revenues from alternative revenue programs | 1 | 26 | (8) | 41 |
Other revenues not from contracts with customers | 6 | 5 | 21 | 14 |
Operating Segments | Ameren Illinois Electric Distribution | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 391 | 389 | 1,133 | 1,135 |
Revenues from alternative revenue programs | (110) | (145) | (59) | (111) |
Other revenues not from contracts with customers | 5 | 1 | 6 | 5 |
Operating Segments | Ameren Illinois Natural Gas | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 122 | 112 | 533 | 568 |
Revenues from alternative revenue programs | 3 | 1 | 17 | 2 |
Other revenues not from contracts with customers | 0 | 1 | 1 | 2 |
Operating Segments | Ameren Transmission | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 141 | 128 | 400 | 351 |
Revenues from alternative revenue programs | 4 | (12) | 34 | (25) |
Other revenues not from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Electricity | Union Electric Company | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 984 | 1,040 | 2,386 | 2,517 |
Operating Segments | Electricity | Union Electric Company | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 455 | 489 | 1,111 | 1,134 |
Operating Segments | Electricity | Union Electric Company | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 343 | 394 | 828 | 943 |
Operating Segments | Electricity | Union Electric Company | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 87 | 94 | 207 | 226 |
Operating Segments | Electricity | Union Electric Company | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 99 | 63 | 240 | 214 |
Operating Segments | Electricity | Ameren Illinois Electric Distribution | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 391 | 389 | 1,133 | 1,135 |
Operating Segments | Electricity | Ameren Illinois Electric Distribution | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 234 | 224 | 664 | 640 |
Operating Segments | Electricity | Ameren Illinois Electric Distribution | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 127 | 123 | 365 | 370 |
Operating Segments | Electricity | Ameren Illinois Electric Distribution | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 26 | 27 | 91 | 94 |
Operating Segments | Electricity | Ameren Illinois Electric Distribution | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 4 | 15 | 13 | 31 |
Operating Segments | Electricity | Ameren Illinois Natural Gas | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Electricity | Ameren Illinois Natural Gas | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Electricity | Ameren Illinois Natural Gas | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Electricity | Ameren Illinois Natural Gas | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Electricity | Ameren Illinois Natural Gas | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Electricity | Ameren Transmission | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 141 | 128 | 400 | 351 |
Operating Segments | Electricity | Ameren Transmission | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Electricity | Ameren Transmission | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Electricity | Ameren Transmission | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Electricity | Ameren Transmission | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 141 | 128 | 400 | 351 |
Operating Segments | Natural Gas | Union Electric Company | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 17 | 19 | 87 | 98 |
Operating Segments | Natural Gas | Union Electric Company | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 8 | 8 | 52 | 56 |
Operating Segments | Natural Gas | Union Electric Company | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 3 | 4 | 20 | 24 |
Operating Segments | Natural Gas | Union Electric Company | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 1 | 1 | 3 | 3 |
Operating Segments | Natural Gas | Union Electric Company | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 5 | 6 | 12 | 15 |
Operating Segments | Natural Gas | Ameren Illinois Electric Distribution | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Natural Gas | Ameren Illinois Electric Distribution | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Natural Gas | Ameren Illinois Electric Distribution | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Natural Gas | Ameren Illinois Electric Distribution | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Natural Gas | Ameren Illinois Electric Distribution | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Natural Gas | Ameren Illinois Natural Gas | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 122 | 112 | 533 | 568 |
Operating Segments | Natural Gas | Ameren Illinois Natural Gas | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 68 | 65 | 375 | 399 |
Operating Segments | Natural Gas | Ameren Illinois Natural Gas | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 18 | 17 | 94 | 105 |
Operating Segments | Natural Gas | Ameren Illinois Natural Gas | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 5 | 2 | 11 | 9 |
Operating Segments | Natural Gas | Ameren Illinois Natural Gas | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 31 | 28 | 53 | 55 |
Operating Segments | Natural Gas | Ameren Transmission | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Natural Gas | Ameren Transmission | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Natural Gas | Ameren Transmission | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Natural Gas | Ameren Transmission | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Natural Gas | Ameren Transmission | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Ameren Illinois Company | Ameren Illinois Electric Distribution | ||||
Disaggregation of Revenue [Line Items] | ||||
Revenues from alternative revenue programs | (110) | (145) | (59) | (111) |
Other revenues not from contracts with customers | 5 | 1 | 6 | 5 |
Operating Segments | Ameren Illinois Company | Ameren Illinois Natural Gas | ||||
Disaggregation of Revenue [Line Items] | ||||
Revenues from alternative revenue programs | 3 | 1 | 17 | 2 |
Other revenues not from contracts with customers | 0 | 1 | 1 | 2 |
Operating Segments | Ameren Illinois Company | Ameren Illinois Transmission | ||||
Disaggregation of Revenue [Line Items] | ||||
Revenues from alternative revenue programs | 5 | (12) | 29 | (26) |
Other revenues not from contracts with customers | 0 | 0 | 0 | 0 |
Operating Segments | Ameren Illinois Company | Electricity | Ameren Illinois Electric Distribution | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 391 | 389 | 1,133 | 1,135 |
Operating Segments | Ameren Illinois Company | Electricity | Ameren Illinois Electric Distribution | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 234 | 224 | 664 | 640 |
Operating Segments | Ameren Illinois Company | Electricity | Ameren Illinois Electric Distribution | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 127 | 123 | 365 | 370 |
Operating Segments | Ameren Illinois Company | Electricity | Ameren Illinois Electric Distribution | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 26 | 27 | 91 | 94 |
Operating Segments | Ameren Illinois Company | Electricity | Ameren Illinois Electric Distribution | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 4 | 15 | 13 | 31 |
Operating Segments | Ameren Illinois Company | Electricity | Ameren Illinois Transmission | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 91 | 81 | 252 | 217 |
Operating Segments | Ameren Illinois Company | Electricity | Ameren Illinois Transmission | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Ameren Illinois Company | Electricity | Ameren Illinois Transmission | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Ameren Illinois Company | Electricity | Ameren Illinois Transmission | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Operating Segments | Ameren Illinois Company | Electricity | Ameren Illinois Transmission | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 91 | 81 | 252 | 217 |
Operating Segments | Ameren Illinois Company | Natural Gas | Ameren Illinois Natural Gas | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 122 | 112 | 533 | 568 |
Operating Segments | Ameren Illinois Company | Natural Gas | Ameren Illinois Natural Gas | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 68 | 65 | 375 | 399 |
Operating Segments | Ameren Illinois Company | Natural Gas | Ameren Illinois Natural Gas | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 18 | 17 | 94 | 105 |
Operating Segments | Ameren Illinois Company | Natural Gas | Ameren Illinois Natural Gas | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 5 | 2 | 11 | 9 |
Operating Segments | Ameren Illinois Company | Natural Gas | Ameren Illinois Natural Gas | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 31 | 28 | 53 | 55 |
Intersegment Eliminations | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | (27) | (29) | (73) | (75) |
Intersegment Eliminations | Electricity | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | (27) | (29) | (73) | (75) |
Intersegment Eliminations | Electricity | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Electricity | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Electricity | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Electricity | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | (27) | (29) | (73) | (75) |
Intersegment Eliminations | Natural Gas | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Natural Gas | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Natural Gas | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Natural Gas | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Natural Gas | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Ameren Illinois Company | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | (15) | (18) | (39) | (47) |
Intersegment Eliminations | Ameren Illinois Company | Residential | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Ameren Illinois Company | Commercial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Ameren Illinois Company | Industrial | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | 0 | 0 | 0 | 0 |
Intersegment Eliminations | Ameren Illinois Company | Other | ||||
Disaggregation of Revenue [Line Items] | ||||
External Revenues | $ (15) | $ (18) | $ (39) | $ (47) |