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Income Taxes (Schedule Of Deferred Tax Assets And Liabilities Resulting From Temporary Differences) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Income Taxes [Line Items] |  |
Plant-related | $ 4,416 | $ 4,129
Regulatory assets and liabilities, net | (449) | (483)
Deferred employee benefit costs - asset | (70) | (88)
Tax carryforwards | (228) | (198)
Other - liabilities | 110 | 109
Total net accumulated deferred income tax liabilities (assets) | 3,779 | 3,469
Accumulated deferred investment tax credits | 25 | 30
Accumulated deferred income taxes and investment tax credits | 3,804 | 3,499
Union Electric Company |  |
Income Taxes [Line Items] |  |
Plant-related | 2,297 | 2,188
Regulatory assets and liabilities, net | (233) | (259)
Deferred employee benefit costs - asset | (55) | (52)
Tax carryforwards | (122) | (68)
Other - liabilities | 70 | 13
Total net accumulated deferred income tax liabilities (assets) | 1,957 | 1,822
Accumulated deferred investment tax credits | 25 | 30
Accumulated deferred income taxes and investment tax credits | 1,982 | 1,852
Ameren Illinois Company |  |
Income Taxes [Line Items] |  |
Plant-related | 1,880 | 1,715
Regulatory assets and liabilities, net | (193) | (199)
Deferred employee benefit costs - liability | 28 | 17
Tax carryforwards | (34) | (46)
Other - liabilities | 18 | 71
Total net accumulated deferred income tax liabilities (assets) | 1,699 | 1,558
Accumulated deferred investment tax credits | 0 | 0
Accumulated deferred income taxes and investment tax credits | 1,699 | 1,558
Other |  |
Income Taxes [Line Items] |  |
Plant-related | 239 | 226
Regulatory assets and liabilities, net | (23) | (25)
Deferred employee benefit costs - asset | (43) | (53)
Tax carryforwards | (72) | (84)
Other - liabilities | 22 | 25
Total net accumulated deferred income tax liabilities (assets) | 123 | 89
Accumulated deferred investment tax credits | 0 | 0
Accumulated deferred income taxes and investment tax credits | $ 123 | $ 89

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- Definition The noncurrent portion of the reserve for accumulated deferred investment tax credits as of the balance sheet date. This is the remaining investment credit, which will reduce the cost of services collected from ratepayers by a ratable portion over the investment's regulatory life. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 255 -SubTopic 10 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=125523840&loc=d3e2408-110839 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.26(b)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 27 -URI http://asc.fasb.org/extlink&oid=123427490&loc=d3e32262-109318 + Details
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