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v3.25.1

Segment Information (Schedule Of Segment Reporting Information By Segment) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Segment Reporting Information [Line Items] |  |
External revenues | $ 2,097 | $ 1,816
Revenues | 2,097 | 1,816
Fuel and purchased power | (502) | (328)
Natural gas purchased for resale | (169) | (151)
Other operations and maintenance expenses | (485) | (470)
Depreciation and amortization | (367) | (361)
Taxes other than income taxes | (144) | (135)
Other Income, Net | 85 | 89
Interest charges | (175) | (154)
Income taxes | (50) | (44)
Noncontrolling interests - preferred stock dividends | (1) | (1)
Net income attributable to Ameren common shareholders | 289 | 261
Interest income | 11 | 8
Capital expenditures | 1,064 | 890
Union Electric Company |  |
Segment Reporting Information [Line Items] |  |
External revenues | 957 | 775
Fuel and purchased power | (330) | (166)
Natural gas purchased for resale | (30) | (28)
Other operations and maintenance expenses | (250) | (254)
Taxes other than income taxes | (89) | (87)
Other Income, Net | 43 | 44
Interest charges | (60) | (62)
Income taxes | (4) | (1)
Noncontrolling interests - preferred stock dividends | (1) | (1)
Net income attributable to Ameren common shareholders | 42 | 25
Net income available to common shareholder | 43 | 26
Ameren Illinois Company |  |
Segment Reporting Information [Line Items] |  |
External revenues | 1,100 | 1,000
Revenues | 1,100 | 1,000
Purchased Power | (175) | (164)
Natural gas purchased for resale | (139) | (123)
Other operations and maintenance expenses | (236) | (210)
Depreciation and amortization | (159) | (153)
Taxes other than income taxes | (51) | (44)
Other Income, Net | 34 | 31
Interest charges | (62) | (55)
Income taxes | (76) | (67)
Net income attributable to Ameren common shareholders | 236 | 215
Net income available to common shareholder | 236 | 215
Interest income | 9 | 6
Capital expenditures | 363 | 373
Operating Segments | Union Electric Company |  |
Segment Reporting Information [Line Items] |  |
External revenues | 950 | 768
Revenues | 957 | 775
Fuel and purchased power | (330) | (166)
Natural gas purchased for resale | (30) | (28)
Other operations and maintenance expenses | (250) | (254)
Depreciation and amortization | (194) | (195)
Taxes other than income taxes | (89) | (87)
Other Income, Net | 43 | 44
Interest charges | (60) | (62)
Income taxes | (4) | (1)
Noncontrolling interests - preferred stock dividends | (1) | (1)
Net income attributable to Ameren common shareholders | 42 | 25
Interest income | 2 | 2
Capital expenditures | 658 | 466
Operating Segments | Ameren Illinois Electric Distribution |  |
Segment Reporting Information [Line Items] |  |
External revenues | 570 | 506
Revenues | 572 | 506
Fuel and purchased power | (212) | (192)
Natural gas purchased for resale | 0 | 0
Other operations and maintenance expenses | (166) | (136)
Depreciation and amortization | (91) | (93)
Taxes other than income taxes | (21) | (17)
Other Income, Net | 23 | 22
Interest charges | (26) | (22)
Income taxes | (16) | (12)
Noncontrolling interests - preferred stock dividends | 0 | 0
Net income attributable to Ameren common shareholders | 63 | 56
Interest income | 8 | 6
Capital expenditures | 167 | 184
Operating Segments | Ameren Illinois Natural Gas |  |
Segment Reporting Information [Line Items] |  |
External revenues | 411 | 391
Revenues | 411 | 391
Fuel and purchased power | 0 | 0
Natural gas purchased for resale | (139) | (123)
Other operations and maintenance expenses | (55) | (58)
Depreciation and amortization | (32) | (33)
Taxes other than income taxes | (29) | (26)
Other Income, Net | 5 | 7
Interest charges | (15) | (15)
Income taxes | (38) | (37)
Noncontrolling interests - preferred stock dividends | 0 | 0
Net income attributable to Ameren common shareholders | 108 | 106
Interest income | 0 | 0
Capital expenditures | 59 | 60
Operating Segments | Ameren Transmission |  |
Segment Reporting Information [Line Items] |  |
External revenues | 166 | 151
Revenues | 210 | 185
Fuel and purchased power | 0 | 0
Natural gas purchased for resale | 0 | 0
Other operations and maintenance expenses | (19) | (19)
Depreciation and amortization | (48) | (39)
Taxes other than income taxes | (1) | (2)
Other Income, Net | 7 | 2
Interest charges | (29) | (29)
Income taxes | (31) | (26)
Noncontrolling interests - preferred stock dividends | 0 | 0
Net income attributable to Ameren common shareholders | 89 | 72
Interest income | 1 | 0
Capital expenditures | 173 | 166
Operating Segments | Ameren Illinois Company | Ameren Illinois Electric Distribution |  |
Segment Reporting Information [Line Items] |  |
External revenues | 572 | 506
Revenues | 572 | 506
Purchased Power | (212) | (192)
Other operations and maintenance expenses | (166) | (136)
Depreciation and amortization | (91) | (93)
Taxes other than income taxes | (21) | (17)
Other Income, Net | 23 | 22
Interest charges | (26) | (22)
Income taxes | (16) | (12)
Net income available to common shareholder | 63 | 56
Interest income | 8 | 6
Capital expenditures | 167 | 184
Operating Segments | Ameren Illinois Company | Ameren Illinois Natural Gas |  |
Segment Reporting Information [Line Items] |  |
External revenues | 411 | 391
Revenues | 411 | 391
Natural gas purchased for resale | (139) | (123)
Other operations and maintenance expenses | (55) | (58)
Depreciation and amortization | (32) | (33)
Taxes other than income taxes | (29) | (26)
Other Income, Net | 5 | 7
Interest charges | (15) | (15)
Income taxes | (38) | (37)
Net income available to common shareholder | 108 | 106
Interest income | 0 | 0
Capital expenditures | 59 | 60
Operating Segments | Ameren Illinois Company | Ameren Illinois Transmission |  |
Segment Reporting Information [Line Items] |  |
External revenues | 117 | 103
Revenues | 154 | 131
Other operations and maintenance expenses | (15) | (16)
Depreciation and amortization | (36) | (27)
Taxes other than income taxes | (1) | (1)
Other Income, Net | 6 | 2
Interest charges | (21) | (18)
Income taxes | (22) | (18)
Net income available to common shareholder | 65 | 53
Interest income | 1 | 0
Capital expenditures | 137 | 129
Other |  |
Segment Reporting Information [Line Items] |  |
Other operations and maintenance expenses | (8) | (14)
Depreciation and amortization | (2) | (1)
Taxes other than income taxes | (4) | (3)
Other Income, Net | 8 | 20
Interest charges | (46) | (32)
Income taxes | 39 | 32
Net income attributable to Ameren common shareholders | (13) | 2
Interest income | 1 | 6
Capital expenditures | 2 | 2
Intersegment Eliminations |  |
Segment Reporting Information [Line Items] |  |
Intersegment revenues | (53) | (41)
Revenues | (53) | (41)
Fuel and purchased power | 40 | 30
Natural gas purchased for resale | 0 | 0
Other operations and maintenance expenses | 13 | 11
Depreciation and amortization | 0 | 0
Taxes other than income taxes | 0 | 0
Other Income, Net | (1) | (6)
Interest charges | 1 | 6
Income taxes | 0 | 0
Noncontrolling interests - preferred stock dividends | 0 | 0
Interest income | (1) | (6)
Capital expenditures | 5 | 12
Intersegment Eliminations | Union Electric Company |  |
Segment Reporting Information [Line Items] |  |
Intersegment revenues | (7) | (7)
Intersegment Eliminations | Ameren Illinois Electric Distribution |  |
Segment Reporting Information [Line Items] |  |
Intersegment revenues | (2) | 0
Intersegment Eliminations | Ameren Illinois Natural Gas |  |
Segment Reporting Information [Line Items] |  |
Intersegment revenues | 0 | 0
Intersegment Eliminations | Ameren Transmission |  |
Segment Reporting Information [Line Items] |  |
Intersegment revenues | (44) | (34)
Intersegment Eliminations | Ameren Illinois Company |  |
Segment Reporting Information [Line Items] |  |
Intersegment revenues | (37) | (28)
Revenues | (37) | (28)
Purchased Power | (37) | (28)
Intersegment Eliminations | Ameren Illinois Company | Ameren Illinois Electric Distribution |  |
Segment Reporting Information [Line Items] |  |
Intersegment revenues | 0 | 0
Intersegment Eliminations | Ameren Illinois Company | Ameren Illinois Natural Gas |  |
Segment Reporting Information [Line Items] |  |
Intersegment revenues | 0 | 0
Intersegment Eliminations | Ameren Illinois Company | Ameren Illinois Transmission |  |
Segment Reporting Information [Line Items] |  |
Intersegment revenues | $ (37) | $ (28)

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