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Financings and Capitalization (Major Long-Term Debt Issuances and Retirements) (Details) - USD ($)
$ in Millions
1 Months Ended
Jul. 31, 2022
Jun. 30, 2022
Sep. 30, 2022
NWO Holdco, L.L.C      
Debt Instrument [Line Items]      
Sale of noncontrolling interest   $ 49  
Term loan facility | Term Loan Facility Due January 2024 | Consumers Energy Company      
Debt Instrument [Line Items]      
Principal (In Millions)     $ 550
Term loan facility | Unsecured Term Loan Credit Agreement Due January 2024 | Consumers Energy Company      
Debt Instrument [Line Items]      
Principal (In Millions) $ 1,000    
Term loan facility | Unsecured Term Loan Credit Agreement Due January 2024 | Consumers Energy Company | SOFR      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.65%    
Term loan facility | Tranche 1 | Consumers Energy Company      
Debt Instrument [Line Items]      
Loans outstanding     $ 300
Interest rate at period end     3.456%
Term loan facility | Tranche 2 | Consumers Energy Company      
Debt Instrument [Line Items]      
Loans outstanding     $ 250
Interest rate at period end     3.714%
Term loan facility | Term Loan Facility Due October 2025      
Debt Instrument [Line Items]      
Principal (In Millions)     $ 76
First mortgage bonds | First Mortgage Bonds Due August 2032 | Consumers Energy Company      
Debt Instrument [Line Items]      
Principal (In Millions)     $ 350
Interest rate     3.60%
First mortgage bonds | First Mortgage Bonds Due September 2052 | Consumers Energy Company      
Debt Instrument [Line Items]      
Principal (In Millions)     $ 450
Interest rate     4.20%