Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Liabilities
Current accounts receivable and notes receivable	$ 7	$ 9
Current portion of long term debt	1,090	373
Current portion of long-term payables	2	23
Carrying Amount
Assets
Long-term receivables	14	14
Liabilities
Long-term debt	14,212	12,419
Long-term payables	9	31
Fair Value
Assets
Long-term receivables	14	14
Liabilities
Long-term debt	12,384	13,800
Long-term payables	7	32
Consumers Energy Company
Liabilities
Current accounts receivable and notes receivable	7	9
Current portion of long term debt	991	365
DB SERP note receivable – related party	7	7
Consumers Energy Company | Carrying Amount
Assets
Long-term receivables	14	14
Notes receivable related party	101	104
Liabilities
Long-term debt	10,183	8,415
Consumers Energy Company | Fair Value
Assets
Long-term receivables	14	14
Notes receivable related party	101	104
Liabilities
Long-term debt	8,728	9,410
Level 1 | Fair Value
Assets
Long-term receivables	0	0
Liabilities
Long-term debt	987	1,189
Long-term payables	0	0
Level 1 | Consumers Energy Company | Fair Value
Assets
Long-term receivables	0	0
Notes receivable related party	0	0
Liabilities
Long-term debt	0	0
Level 2 | Fair Value
Assets
Long-term receivables	0	0
Liabilities
Long-term debt	8,741	10,656
Long-term payables	0	0
Level 2 | Consumers Energy Company | Fair Value
Assets
Long-term receivables	0	0
Notes receivable related party	0	0
Liabilities
Long-term debt	6,172	7,455
Level 3 | Fair Value
Assets
Long-term receivables	14	14
Liabilities
Long-term debt	2,656	1,955
Long-term payables	7	32
Level 3 | Consumers Energy Company | Fair Value
Assets
Long-term receivables	14	14
Notes receivable related party	101	104
Liabilities
Long-term debt	$ 2,556	$ 1,955