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Plant, Property, and Equipment (Schedule Of Depreciation And Amortization Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense – plant, property, and equipment | $ 842 | $ 778 | $ 739
Total depreciation and amortization expense | 992 | 933 | 881
Securitized regulatory assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 26 | 25 | 25
Software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 121 | 127 | 114
Other intangible assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 3 | 3 | 3
Consumers Energy Company |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense – plant, property, and equipment | 827 | 768 | 732
Total depreciation and amortization expense | 975 | 921 | 872
Consumers Energy Company | Securitized regulatory assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 26 | 25 | 25
Consumers Energy Company | Software |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 119 | 125 | 112
Consumers Energy Company | Other intangible assets |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | $ 3 | $ 3 | $ 3

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