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Segment Information (Schedule Of Segment Reporting Information By Segment) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Segment Reporting Information [Line Items] |  |  |  |
External revenues | $ 2,699 | $ 2,173 | $ 7,017 | $ 5,682
Revenues | 2,699 | 2,173 | 7,017 | 5,682
Fuel and purchased power | (768) | (499) | (2,064) | (1,154)
Natural gas purchased for resale | (25) | (30) | (233) | (214)
Other operations and maintenance expenses | (502) | (520) | (1,447) | (1,455)
Depreciation and amortization | (415) | (388) | (1,168) | (1,125)
Taxes other than income taxes | (164) | (150) | (439) | (416)
Other Income, Net | 76 | 101 | 257 | 293
Interest charges | (208) | (173) | (570) | (492)
Income taxes | (52) | (57) | (145) | (140)
Noncontrolling interests - preferred stock dividends | (1) | (1) | (4) | (4)
Net income attributable to Ameren common shareholders | 640 | 456 | 1,204 | 975
Interest income | 10 | 8 | 31 | 29
Capital expenditures | 988 | 1,137 | 3,118 | 3,029
Union Electric Company |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
External revenues | 1,705 | 1,342 | 4,002 | 3,005
Fuel and purchased power | (487) | (334) | (1,431) | (689)
Natural gas purchased for resale | (6) | (4) | (45) | (41)
Other operations and maintenance expenses | (260) | (288) | (748) | (789)
Taxes other than income taxes | (122) | (109) | (300) | (287)
Other Income, Net | 45 | 51 | 135 | 144
Interest charges | (85) | (62) | (215) | (187)
Income taxes | (32) | 6 | (43) | 4
Noncontrolling interests - preferred stock dividends | (1) | (1) | (3) | (3)
Net income attributable to Ameren common shareholders | 518 | 381 | 710 | 534
Ameren Illinois Company |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
External revenues | 946 | 793 | 2,889 | 2,559
Revenues | 946 | 793 | 2,889 | 2,559
Purchased Power | (284) | (169) | (642) | (474)
Natural gas purchased for resale | (19) | (26) | (188) | (173)
Other operations and maintenance expenses | (241) | (229) | (702) | (663)
Depreciation and amortization | (162) | (155) | (484) | (462)
Taxes other than income taxes | (38) | (37) | (126) | (116)
Other Income, Net | 30 | 37 | 101 | 105
Interest charges | (67) | (63) | (192) | (178)
Income taxes | (17) | (37) | (134) | (144)
Noncontrolling interests - preferred stock dividends | 0 | 0 | (1) | (1)
Net Income Available to Common Shareholder | 148 | 114 | 521 | 453
Net income attributable to Ameren common shareholders | 148 | 114 | 521 | 453
Interest income | 7 | 7 | 24 | 22
Capital expenditures | 385 | 374 | 1,127 | 1,091
Operating Segments | Union Electric Company |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
External revenues | 1,696 | 1,333 | 3,978 | 2,980
Revenues | 1,705 | 1,342 | 4,002 | 3,005
Fuel and purchased power | (487) | (334) | (1,431) | (689)
Natural gas purchased for resale | (6) | (4) | (45) | (41)
Other operations and maintenance expenses | (260) | (288) | (748) | (789)
Depreciation and amortization | (239) | (220) | (642) | (623)
Taxes other than income taxes | (122) | (109) | (300) | (287)
Other Income, Net | 45 | 51 | 135 | 144
Interest charges | (85) | (62) | (215) | (187)
Income taxes | (32) | 6 | (43) | 4
Noncontrolling interests - preferred stock dividends | (1) | (1) | (3) | (3)
Net Income Available to Common Shareholder | 518 | 381 | 710 | 534
Interest income | 3 | 2 | 7 | 7
Capital expenditures | 548 | 735 | 1,873 | 1,839
Operating Segments | Ameren Illinois Electric Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
External revenues | 698 | 551 | 1,838 | 1,566
Revenues | 699 | 552 | 1,844 | 1,567
Fuel and purchased power | (330) | (204) | (765) | (564)
Natural gas purchased for resale | 0 | 0 | 0 | 0
Other operations and maintenance expenses | (171) | (163) | (493) | (452)
Depreciation and amortization | (92) | (92) | (276) | (278)
Taxes other than income taxes | (22) | (21) | (63) | (57)
Other Income, Net | 20 | 23 | 66 | 72
Interest charges | (28) | (25) | (80) | (73)
Income taxes | (19) | (14) | (48) | (41)
Noncontrolling interests - preferred stock dividends | 0 | 0 | (1) | (1)
Net Income Available to Common Shareholder | 57 | 56 | 184 | 173
Interest income | 6 | 6 | 22 | 21
Capital expenditures | 163 | 152 | 483 | 468
Operating Segments | Ameren Illinois Natural Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
External revenues | 117 | 121 | 686 | 660
Revenues | 117 | 121 | 686 | 660
Fuel and purchased power | 0 | 0 | 0 | 0
Natural gas purchased for resale | (19) | (26) | (188) | (173)
Other operations and maintenance expenses | (55) | (51) | (165) | (168)
Depreciation and amortization | (33) | (32) | (98) | (98)
Taxes other than income taxes | (15) | (14) | (60) | (55)
Other Income, Net | 4 | 6 | 14 | 20
Interest charges | (16) | (16) | (47) | (46)
Income taxes | 4 | 2 | (37) | (38)
Noncontrolling interests - preferred stock dividends | 0 | 0 | 0 | 0
Net Income Available to Common Shareholder | (13) | (10) | 105 | 102
Interest income | 0 | 1 | 0 | 1
Capital expenditures | 78 | 83 | 225 | 202
Operating Segments | Ameren Transmission |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
External revenues | 188 | 168 | 515 | 476
Revenues | 240 | 210 | 658 | 586
Fuel and purchased power | 0 | 0 | 0 | 0
Natural gas purchased for resale | 0 | 0 | 0 | 0
Other operations and maintenance expenses | (19) | (19) | (56) | (54)
Depreciation and amortization | (49) | (42) | (146) | (121)
Taxes other than income taxes | (3) | (2) | (7) | (6)
Other Income, Net | (3) | 8 | 14 | 14
Interest charges | (31) | (31) | (89) | (89)
Income taxes | 16 | (34) | (48) | (89)
Noncontrolling interests - preferred stock dividends | 0 | 0 | 0 | 0
Net Income Available to Common Shareholder | 151 | 90 | 326 | 241
Interest income | 1 | 0 | 2 | 1
Capital expenditures | 174 | 174 | 505 | 515
Operating Segments | Ameren Illinois Company | Ameren Illinois Electric Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
External revenues | 699 | 552 | 1,844 | 1,567
Revenues | 699 | 552 | 1,844 | 1,567
Purchased Power | (330) | (204) | (765) | (564)
Natural gas purchased for resale | 0 | 0 | 0 | 0
Other operations and maintenance expenses | (171) | (163) | (493) | (452)
Depreciation and amortization | (92) | (92) | (276) | (278)
Taxes other than income taxes | (22) | (21) | (63) | (57)
Other Income, Net | 20 | 23 | 66 | 72
Interest charges | (28) | (25) | (80) | (73)
Income taxes | (19) | (14) | (48) | (41)
Noncontrolling interests - preferred stock dividends |  |  | (1) | (1)
Net Income Available to Common Shareholder | 57 | 56 | 184 | 173
Interest income | 6 | 6 | 22 | 21
Capital expenditures | 163 | 152 | 483 | 468
Operating Segments | Ameren Illinois Company | Ameren Illinois Natural Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
External revenues | 117 | 121 | 686 | 660
Revenues | 117 | 121 | 686 | 660
Purchased Power | 0 | 0 | 0 | 0
Natural gas purchased for resale | (19) | (26) | (188) | (173)
Other operations and maintenance expenses | (55) | (51) | (165) | (168)
Depreciation and amortization | (33) | (32) | (98) | (98)
Taxes other than income taxes | (15) | (14) | (60) | (55)
Other Income, Net | 4 | 6 | 14 | 20
Interest charges | (16) | (16) | (47) | (46)
Income taxes | 4 | 2 | (37) | (38)
Noncontrolling interests - preferred stock dividends |  |  | 0 | 0
Net Income Available to Common Shareholder | (13) | (10) | 105 | 102
Interest income | 0 | 1 | 0 | 1
Capital expenditures | 78 | 83 | 225 | 202
Operating Segments | Ameren Illinois Company | Ameren Illinois Transmission |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
External revenues | 130 | 120 | 359 | 332
Revenues | 176 | 155 | 482 | 422
Purchased Power | 0 | 0 | 0 | 0
Natural gas purchased for resale | 0 | 0 | 0 | 0
Other operations and maintenance expenses | (15) | (15) | (44) | (43)
Depreciation and amortization | (37) | (31) | (110) | (86)
Taxes other than income taxes | (1) | (2) | (3) | (4)
Other Income, Net | 6 | 8 | 21 | 13
Interest charges | (23) | (22) | (65) | (59)
Income taxes | (2) | (25) | (49) | (65)
Noncontrolling interests - preferred stock dividends |  |  | 0 | 0
Net Income Available to Common Shareholder | 104 | 68 | 232 | 178
Interest income | 1 | 0 | 2 | 0
Capital expenditures | 144 | 139 | 419 | 421
Other |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Other operations and maintenance expenses | (10) | (12) | (26) | (29)
Depreciation and amortization | (2) | (2) | (6) | (5)
Taxes other than income taxes | (2) | (4) | (9) | (11)
Other Income, Net | 11 | 16 | 31 | 54
Interest charges | (49) | (42) | (142) | (108)
Income taxes | (21) | (17) | 31 | 24
Noncontrolling interests - preferred stock dividends | 0 | 0 | 0 | 0
Net Income Available to Common Shareholder | (73) | (61) | (121) | (75)
Interest income | 1 | 2 | 3 | 10
Capital expenditures | 1 | 2 | 6 | 6
Intersegment Eliminations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment revenues | (62) | (52) | (173) | (136)
Revenues | (62) | (52) | (173) | (136)
Fuel and purchased power | 49 | 39 | 132 | 99
Natural gas purchased for resale | 0 | 0 | 0 | 0
Other operations and maintenance expenses | 13 | 13 | 41 | 37
Depreciation and amortization | 0 | 0 | 0 | 0
Taxes other than income taxes | 0 | 0 | 0 | 0
Other Income, Net | (1) | (3) | (3) | (11)
Interest charges | 1 | 3 | 3 | 11
Income taxes | 0 | 0 | 0 | 0
Noncontrolling interests - preferred stock dividends | 0 | 0 | 0 | 0
Interest income | (1) | (3) | (3) | (11)
Capital expenditures | 24 | (9) | 26 | (1)
Intersegment Eliminations | Union Electric Company |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment revenues | (9) | (9) | (24) | (25)
Intersegment Eliminations | Ameren Illinois Electric Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment revenues | (1) | (1) | (6) | (1)
Intersegment Eliminations | Ameren Illinois Natural Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment revenues | 0 | 0 | 0 | 0
Intersegment Eliminations | Ameren Transmission |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment revenues | (52) | (42) | (143) | (110)
Intersegment Eliminations | Ameren Illinois Company |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment revenues | (46) | (35) | (123) | (90)
Revenues | (46) | (35) | (123) | (90)
Purchased Power | (46) | (35) | (123) | (90)
Intersegment Eliminations | Ameren Illinois Company | Ameren Illinois Electric Distribution |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment revenues | 0 | 0 | 0 | 0
Intersegment Eliminations | Ameren Illinois Company | Ameren Illinois Natural Gas |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment revenues | 0 | 0 | 0 | 0
Intersegment Eliminations | Ameren Illinois Company | Ameren Illinois Transmission |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Intersegment revenues | $ (46) | $ (35) | $ (123) | $ (90)

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