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Schedule I - Condensed Financial Information Of Parent (Statement of Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Condensed Financial Statements, Captions [Line Items] |  |  |
Operating revenues | $ 7,957 | $ 6,394 | $ 5,794
Operating expenses | 6,442 | 5,061 | 4,494
Operating loss | 1,515 | 1,333 | 1,300
Equity in earnings of subsidiaries | 2 | 12 | 3
Interest income from affiliates | 11 | 2 | 4
Total other expense, net | 226 | 202 | 151
Interest Charges | (486) | (383) | (419)
Income tax benefit | 176 | 157 | 155
Comprehensive Income from Continuing Operations |  |  |
Pension and other postretirement benefit plan activity, net of income taxes (benefit) | (14) | 14 | 16
Comprehensive Income Attributable to Ameren Common Shareholders | 1,060 | 1,004 | 887
Other Comprehensive Income (Loss), Taxes: |  |  |
Pension and other postretirement benefit plan activity, tax (benefit) | (4) | 4 | 5
Parent Company |  |  |
Condensed Financial Statements, Captions [Line Items] |  |  |
Operating revenues | 0 | 0 | 0
Operating expenses | 15 | 13 | 12
Operating loss | (15) | (13) | (12)
Equity in earnings of subsidiaries | 1,161 | 1,039 | 908
Interest income from affiliates | 2 | 3 | 4
Total other expense, net | (13) | 0 | (8)
Interest Charges | (86) | (64) | (57)
Income tax benefit | 25 | 25 | 36
Net Income Attributable to Ameren Common Shareholders | 1,074 | 990 | 871
Comprehensive Income from Continuing Operations |  |  |
Pension and other postretirement benefit plan activity, net of income taxes (benefit) | (14) | 14 | 16
Comprehensive Income Attributable to Ameren Common Shareholders | 1,060 | 1,004 | 887
Other Comprehensive Income (Loss), Taxes: |  |  |
Pension and other postretirement benefit plan activity, tax (benefit) | $ (4) | $ 4 | $ 5

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