v3.26.1
Financings and Capitalization (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions
 1 Months Ended 6 Months Ended 12 Months Ended
May 31, 2026
Dec. 31, 2025
Jun. 30, 2026
Dec. 31, 2023
Mar. 31, 2026
Schedule Of Financing And Capitalization [Line Items]          
Limitation on payment of stock dividends     $ 9,600,000,000    
Dividends paid     $ 448,000,000    
Stock offering program maximum value $ 3,000,000,000     $ 1,000,000,000  
Shares contracted under forward sale agreements (in shares)     6.4    
Initial forward price (in dollars per share)     $ 75.63    
Settlement Of Forward Contracts          
Schedule Of Financing And Capitalization [Line Items]          
Shares subject to forward equity sale agreement (in shares)     6.5    
Settlement of forward contracts through issuance of stock (in dollars per share)     $ 75.80    
Issuance of common stock     $ 495,000,000    
Consumers Energy Company          
Schedule Of Financing And Capitalization [Line Items]          
Unrestricted retained earnings     2,600,000,000    
Consumers Energy Company | Related Party          
Schedule Of Financing And Capitalization [Line Items]          
Notes payable   $ 340,000,000 0    
Consumers Energy Company | Credit Agreement | Related Party          
Schedule Of Financing And Capitalization [Line Items]          
Maximum borrowing capacity   $ 500,000,000     $ 750,000,000
Basis spread on variable rate (in percent)   0.10%      
Notes payable     $ 0    
NorthStar Clean Energy          
Schedule Of Financing And Capitalization [Line Items]          
Supplier financing program, payment period (in days)     135 days    
Supplier financing program, termination period (in days)     30 days    
NorthStar Clean Energy | NorthStar Clean Energy's Supplier Financing Program          
Schedule Of Financing And Capitalization [Line Items]          
Supplier finance obligations   $ 78,000,000 $ 45,000,000    
Commercial Paper | Consumers Energy Company          
Schedule Of Financing And Capitalization [Line Items]          
Short-term debt authorized borrowings     500,000,000    
Short-term borrowings outstanding     $ 0