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Financings And Capitalization (Major Long-Term Debt Transactions) (Details) | 9 Months Ended
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Sep. 30, 2016 USD ($)
Debt Instrument [Line Items] |
Principal Balance | $ 750,000,000
Debt retirement, principal | 173,000,000
CMS Energy [Member] |
Debt Instrument [Line Items] |
Principal Balance | 300,000,000
Consumers Energy Company [Member] |
Debt Instrument [Line Items] |
Principal Balance | 450,000,000
Debt retirement, principal | 173,000,000
Senior Notes 3.000% Due May 2026 [Member] | CMS Energy [Member] |
Debt Instrument [Line Items] |
Principal Balance | $ 300,000,000
Interest rate | 3.00%
Debt issuance date | May 2016
Maturity date | May 2026
FMB's 3.250% Due 2046 [Member] | Consumers Energy Company [Member] |
Debt Instrument [Line Items] |
Principal Balance | $ 450,000,000
Interest rate | 3.25%
Debt issuance date | August 2016
Maturity date | August 2046
FMB's 5.500% Due 2016 [Member] | Consumers Energy Company [Member] |
Debt Instrument [Line Items] |
Debt retirement, principal | $ 173,000,000
Interest rate | 5.50%
Debt retirement date | August 2016
Maturity date | August 2016

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- Definition Date when the debt instrument was partially or fully repaid, which may be presented in a variety of ways (year, month and year, day, month and year, quarter, etc.). + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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