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Income Taxes (Schedule Of Components Of Income Tax Expense (Benefit)) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Income Taxes [Line Items] |  |  |
Current Federal taxes | $ 5 | $ 7 | $ 2
Current State taxes | 1 | (6) | 5
Deferred Federal Income Tax Expense (Benefit) | 194 | 170 | 187
Deferred State taxes | 80 | 86 | 57
Amortization of excess deferred income taxes | (100) | (96) | (91)
Amortization of deferred investment tax credits | (4) | (4) | (5)
Income tax benefit | 176 | 157 | 155
Union Electric Company |  |  |
Income Taxes [Line Items] |  |  |
Current Federal taxes | (26) | 0 | 14
Current State taxes | (5) | 0 | 3
Deferred Federal Income Tax Expense (Benefit) | 93 | 65 | 82
Deferred State taxes | 18 | 23 | 15
Amortization of excess deferred income taxes | (86) | (81) | (75)
Amortization of deferred investment tax credits | (4) | (4) | (5)
Income tax benefit | (10) | 3 | 34
Ameren Illinois Company |  |  |
Income Taxes [Line Items] |  |  |
Current Federal taxes | 46 | (15) | 12
Current State taxes | 16 | (7) | (6)
Deferred Federal Income Tax Expense (Benefit) | 82 | 120 | 81
Deferred State taxes | 48 | 59 | 52
Amortization of excess deferred income taxes | (13) | (14) | (15)
Amortization of deferred investment tax credits | 0 | 0 | 0
Income tax benefit | 179 | 143 | 124
Other |  |  |
Income Taxes [Line Items] |  |  |
Current Federal taxes | (15) | 22 | (24)
Current State taxes | (10) | 1 | 8
Deferred Federal Income Tax Expense (Benefit) | 19 | (15) | 24
Deferred State taxes | 14 | 4 | (10)
Amortization of excess deferred income taxes | (1) | (1) | (1)
Amortization of deferred investment tax credits | 0 | 0 | 0
Income tax benefit | $ 7 | $ 11 | $ (3)

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