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Property And Plant, Net (Schedule Of Property And Plant, Net) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Property, Plant and Equipment [Line Items]    
Accumulated depreciation and amortization $ 16,569 $ 16,495
Property, plant, and equipment, net 39,313 36,304
Depreciable Property, Plant And Equipment    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 52,870 50,790
Property, plant, and equipment, net 36,301 34,295
Coal Fired Electric Generation Equipment    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 3,640 3,556
Natural Gas and Oil Fired Electric Generation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 948 938
Nuclear    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 6,255 5,931
Renewable Electric Generation Equipment    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 3,091 2,920
Electric distribution    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 18,963 17,629
Electric transmission    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 10,910 10,162
Natural gas    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 5,479 5,197
Other    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 3,584 4,457
Nuclear fuel in progress    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 194 268
Oil Fired Electric Generation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 30  
Other    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 2,818 1,741
Ameren Missouri    
Property, Plant and Equipment [Line Items]    
Accumulated depreciation and amortization 11,090 10,875
Property, plant, and equipment, net 20,604 18,788
Ameren Missouri | Depreciable Property, Plant And Equipment    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 29,568 28,404
Property, plant, and equipment, net 18,478 17,529
Ameren Missouri | Coal Fired Electric Generation Equipment    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 3,640 3,556
Ameren Missouri | Natural Gas and Oil Fired Electric Generation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 948 938
Ameren Missouri | Nuclear    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 6,255 5,931
Ameren Missouri | Renewable Electric Generation Equipment    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 3,072 2,901
Ameren Missouri | Electric distribution    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 10,205 9,469
Ameren Missouri | Electric transmission    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 2,479 2,406
Ameren Missouri | Natural gas    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 837 776
Ameren Missouri | Other    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 2,132 2,427
Ameren Missouri | Nuclear fuel in progress    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 194 268
Ameren Missouri | Other    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 1,932 991
Ameren Illinois    
Property, Plant and Equipment [Line Items]    
Accumulated depreciation and amortization 5,219 5,184
Property, plant, and equipment, net 16,567 15,530
Ameren Illinois | Depreciable Property, Plant And Equipment    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 21,078 20,095
Property, plant, and equipment, net 15,859 14,911
Ameren Illinois | Coal Fired Electric Generation Equipment    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 0 0
Ameren Illinois | Natural Gas and Oil Fired Electric Generation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 0 0
Ameren Illinois | Nuclear    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 0 0
Ameren Illinois | Renewable Electric Generation Equipment    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 19 19
Ameren Illinois | Electric distribution    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 8,758 8,160
Ameren Illinois | Electric transmission    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 6,247 5,725
Ameren Illinois | Natural gas    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 4,642 4,421
Ameren Illinois | Other    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 1,412 1,770
Ameren Illinois | Nuclear fuel in progress    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 0 0
Ameren Illinois | Other    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 708 619
Other    
Property, Plant and Equipment [Line Items]    
Accumulated depreciation and amortization 260 436
Property, plant, and equipment, net 2,142 1,986
Other | Depreciable Property, Plant And Equipment    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 2,224 2,291
Property, plant, and equipment, net 1,964 1,855
Other | Coal Fired Electric Generation Equipment    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 0 0
Other | Natural Gas and Oil Fired Electric Generation Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 0 0
Other | Nuclear    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 0 0
Other | Renewable Electric Generation Equipment    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 0 0
Other | Electric distribution    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 0 0
Other | Electric transmission    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 2,184 2,031
Other | Natural gas    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 0 0
Other | Other    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 40 260
Other | Nuclear fuel in progress    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost 0 0
Other | Other    
Property, Plant and Equipment [Line Items]    
Property and plant, at original cost $ 178 $ 131
Minimum | Electric distribution    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 20 years  
Minimum | Electric transmission    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 50 years  
Minimum | Natural gas    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 15 years  
Minimum | Other    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 2 years  
Minimum | Electric generation    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 5 years  
Maximum | Electric distribution    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 80 years  
Maximum | Electric transmission    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 75 years  
Maximum | Natural gas    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 80 years  
Maximum | Other    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 55 years  
Maximum | Electric generation    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 72 years  
Maximum | Ameren Missouri | Electric generation    
Property, Plant and Equipment [Line Items]    
Property, Plant and Equipment, Useful Life 150 years