XML 69 R52.htm IDEA: XBRL DOCUMENT v3.21.2
Cash And Cash Equivalents (Schedule Of Cash And Cash Equivalents, Including Restricted Amounts) (Details) - USD ($)
$ in Millions
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Dec. 31, 2019
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents $ 102 $ 32    
Restricted cash and cash equivalents 30 17    
Cash and cash equivalents, including restricted amounts 236 185 $ 558 $ 157
Discontinued Operations, Held-for-sale        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 104 136    
Consumers Energy Company        
Cash and Cash Equivalents [Line Items]        
Cash and cash equivalents 29 20    
Restricted cash and cash equivalents 26 15    
Cash and cash equivalents, including restricted amounts $ 55 $ 35 $ 223 $ 28