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Retirement Benefits (Schedule Of Expected Benefit Payments) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2013
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Pension [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Benefit Payments, 2014 | $ 119 |
Benefit Payments, 2015 | 127 |
Benefit Payments, 2016 | 134 |
Benefit Payments, 2017 | 139 |
Benefit Payments, 2018 | 144 |
Benefit Payments, 2019-2023 | 760 |
Pension [Member] | Consumers Energy Company [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Benefit Payments, 2014 | 116 |
Benefit Payments, 2015 | 124 |
Benefit Payments, 2016 | 131 |
Benefit Payments, 2017 | 136 |
Benefit Payments, 2018 | 140 |
Benefit Payments, 2019-2023 | 740 |
DB SERP [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Benefit Payments, 2014 | 8 |
Benefit Payments, 2015 | 8 |
Benefit Payments, 2016 | 8 |
Benefit Payments, 2017 | 8 |
Benefit Payments, 2018 | 8 |
Benefit Payments, 2019-2023 | 48 |
DB SERP [Member] | Consumers Energy Company [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Benefit Payments, 2014 | 4 |
Benefit Payments, 2015 | 5 |
Benefit Payments, 2016 | 5 |
Benefit Payments, 2017 | 5 |
Benefit Payments, 2018 | 5 |
Benefit Payments, 2019-2023 | 27 |
OPEB [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Benefit Payments, 2014 | 58 | [1]
Benefit Payments, 2015 | 59 | [1]
Benefit Payments, 2016 | 61 | [1]
Benefit Payments, 2017 | 64 | [1]
Benefit Payments, 2018 | 66 | [1]
Benefit Payments, 2019-2023 | 364 | [1]
Subsidy to be received, 2014 | 6 |
OPEB [Member] | Consumers Energy Company [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Benefit Payments, 2014 | 56 | [1]
Benefit Payments, 2015 | 57 | [1]
Benefit Payments, 2016 | 59 | [1]
Benefit Payments, 2017 | 61 | [1]
Benefit Payments, 2018 | 64 | [1]
Benefit Payments, 2019-2023 | 349 | [1]
Subsidy to be received, 2014 | $ 5 |
[1] | CMS Energy’s and Consumers’ OPEB benefit payments are net of employee contributions and expected Medicare Part D subsidy payments for 2014. CMS Energy and Consumers plan to change the Medicare drug program provided through the OPEB Plan from an employer-sponsored drug plan to an EGWP to begin on January 1, 2015; therefore, no Medicare Part D subsidy is expected after 2014. For CMS Energy, subsidies to be received are estimated to be $6 million for 2014. For Consumers, subsidies to be received are estimated to be $5 million for 2014.

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- Definition Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Amount of the prescription drug subsidy receipts to be received in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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