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Financings and Capitalization (Issuance of Convertible Senior Notes) (Details)
$ / shares in Units, $ in Millions
1 Months Ended
May 31, 2023
USD ($)
d
$ / shares
Sep. 30, 2023
USD ($)
Debt Instrument [Line Items]    
Principal (In Millions)   $ 2,910
CMS Energy    
Debt Instrument [Line Items]    
Principal (In Millions)   800
3.375% Convertible Senior Notes Due 2028 | Convertible debt | CMS Energy    
Debt Instrument [Line Items]    
Principal (In Millions) $ 800 $ 800
Interest rate 3.375% 3.375%
Unamortized issuance costs $ 12  
Conversion ratio 0.0135194  
Conversion price (in dollars per share) | $ / shares $ 73.97  
Threshold percentage of stock price trigger 130.00%  
Threshold trading days | d 20  
Threshold consecutive trading days | d 30  
Redemption price percentage 100.00%