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Plant, Property, and Equipment (Schedule Of Depreciation And Amortization Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense - plant, property, and equipment | $ 687 | $ 591 | $ 551
Total depreciation and amortization expense | 811 | 750 | 685
Securitized Regulatory Assets [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 25 | 83 | 75
Other Regulatory Assets [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense |  | 2 | 5
Software [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 96 | 70 | 50
Other Intangible Assets [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 3 | 4 | 4
Consumers Energy Company [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Depreciation expense - plant, property, and equipment | 680 | 586 | 546
Total depreciation and amortization expense | 803 | 744 | 678
Consumers Energy Company [Member] | Securitized Regulatory Assets [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 25 | 83 | 75
Consumers Energy Company [Member] | Other Regulatory Assets [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense |  | 2 | 5
Consumers Energy Company [Member] | Software [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | 95 | 69 | 49
Consumers Energy Company [Member] | Other Intangible Assets [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Amortization expense | $ 3 | $ 4 | $ 3

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- Definition The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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- Definition The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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