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Retirement Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Defined Benefit Plan Disclosure [Line Items] |  |  |
Reduced regulatory income tax liabilities | $ 86 | $ 131 |
Increased income tax expense | 302 | 245 | 191
Union employees percentage | 43.00% |  |
CMS Energy [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Increased income tax expense | (50) | (62) | (61)
Consumers Energy Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Reduced regulatory income tax liabilities | 86 | 131 |
Increased income tax expense | 346 | 297 | 267
Union employees percentage | 45.00% |  |
Pension [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Trust assets | 1,964 | 1,727 | 1,626
Amortization of net actuarial loss from regulatory asset | 57 |  |
Amortization of net actuarial loss, net of tax | 2 |  |
Estimated time of amortization of gains losses | 10 years | 11 years | 11 years
Investment grade bonds included in the corporate debt investments category of the plan trust assets |  | 68.00% |
High-yield bonds included in the corporate debt investments category of the Plan trust assets |  | 32.00% |
U.S. equity securities included in the Pooled funds category of the Plan trust assets | 61.00% | 51.00% |
Foreign equity securities included in the Pooled funds category of the Plan trust assets | 28.00% | 26.00% |
Foreign fixed-income securities included in the Pooled funds category of the Plan trust assets | 3.00% | 14.00% |
U.S. fixed-income securities included in the Pooled funds category of the Plan trust assets | 4.00% | 4.00% |
Alternative investments included in the Pooled funds category of the Plan trust assets | 4.00% | 5.00% |
Pension [Member] | Consumers Energy Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortization of net actuarial loss from regulatory asset | 57 |  |
Estimated time of amortization of gains losses | 10 years | 11 years | 11 years
401 (K) Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer match of eligible contributions | 60.00% | 60.00% | 60.00%
Employer match of eligible wages | 6.00% | 6.00% | 6.00%
Savings plan, cost recognized | 17 | 16 | 16
401 (K) Plan [Member] | Consumers Energy Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer match of eligible contributions | 60.00% | 60.00% | 60.00%
Employer match of eligible wages | 6.00% | 6.00% | 6.00%
Savings plan, cost recognized | 17 | 16 | 16
OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Trust assets | 1,218 | 1,047 | 924
Retirement age requirement | 55 | 55 | 55
Retirement years of service | 10 years | 10 years | 10 years
Retirement years of service with disability | 15 years | 15 years | 15 years
Ultimate health care cost trend rate | 4.75% |  |
Year that rate reaches ultimate trend rate | 2024 |  |
Amortization of net prior service cost (credit) from regulatory liability | 37 |  |
Amortization of net prior service cost (credit) from AOCI | (1) |  |
Estimated time of amortization of gains losses | 13 years | 13 years | 13 years
Estimated time of prior service cost | 10 years |  |
Investment grade bonds included in the corporate debt investments category of the plan trust assets |  | 68.00% |
High-yield bonds included in the corporate debt investments category of the Plan trust assets |  | 32.00% |
U.S. equity securities included in the Pooled funds category of the Plan trust assets | 60.00% | 65.00% |
Foreign equity securities included in the Pooled funds category of the Plan trust assets | 20.00% | 21.00% |
Foreign fixed-income securities included in the Pooled funds category of the Plan trust assets | 4.00% | 9.00% |
U.S. fixed-income securities included in the Pooled funds category of the Plan trust assets | 14.00% | 3.00% |
Alternative investments included in the Pooled funds category of the Plan trust assets | 2.00% | 2.00% |
OPEB [Member] | Consumers Energy Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Trust assets | 1,141 | 978 | 861
Retirement age requirement | 55 | 55 | 55
Retirement years of service | 10 years | 10 years | 10 years
Retirement years of service with disability | 15 years | 15 years | 15 years
Ultimate health care cost trend rate | 4.75% |  |
Year that rate reaches ultimate trend rate | 2024 |  |
Amortization of net prior service cost (credit) from regulatory liability | 37 |  |
Estimated time of amortization of gains losses | 13 years | 13 years | 13 years
Estimated time of prior service cost | 10 years |  |
Investment grade bonds included in the corporate debt investments category of the plan trust assets |  | 68.00% |
High-yield bonds included in the corporate debt investments category of the Plan trust assets |  | 32.00% |
U.S. equity securities included in the Pooled funds category of the Plan trust assets | 60.00% | 65.00% |
Foreign equity securities included in the Pooled funds category of the Plan trust assets | 20.00% | 21.00% |
Foreign fixed-income securities included in the Pooled funds category of the Plan trust assets | 4.00% | 9.00% |
U.S. fixed-income securities included in the Pooled funds category of the Plan trust assets | 14.00% | 3.00% |
Alternative investments included in the Pooled funds category of the Plan trust assets | 2.00% | 2.00% |
Pension And OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortized net gains and losses in excess of PBO or MRV | 10.00% | 10.00% | 10.00%
Pension And OPEB [Member] | Consumers Energy Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Amortized net gains and losses in excess of PBO or MRV | 10.00% | 10.00% | 10.00%
Defined Company Contribution Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contribution, percentage of base pay | 6.00% | 6.00% | 6.00%
Plan cost, defined contribution plan | 10 | 8 | 7
Defined Company Contribution Plan [Member] | Consumers Energy Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Employer contribution, percentage of base pay | 6.00% | 6.00% | 6.00%
Plan cost, defined contribution plan | 10 | 8 | 7
DC SERP [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum years of participation before vesting | 5 years |  |
Trust assets | 1 | 1 |
DC SERP [Member] | Consumers Energy Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Minimum years of participation before vesting | 5 years |  |
Trust assets | 1 | 1 |
Minimum [Member] | DC SERP [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan contribution percentage | 5.00% |  |
Minimum [Member] | DC SERP [Member] | Consumers Energy Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan contribution percentage | 5.00% |  |
Maximum [Member] | DC SERP [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan cost, defined contribution plan | 1 | 1 | 1
Plan contribution percentage | 15.00% |  |
Maximum [Member] | DC SERP [Member] | Consumers Energy Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Plan cost, defined contribution plan | 1 | 1 | 1
Plan contribution percentage | 15.00% |  |
Under Age 65 [Member] | OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Health care cost trend rate assumed for next fiscal year | 6.50% | 8.00% |
Under Age 65 [Member] | OPEB [Member] | Consumers Energy Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Health care cost trend rate assumed for next fiscal year | 6.50% | 8.00% |
Over Age 65 [Member] | OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Health care cost trend rate assumed for next fiscal year | 6.50% | 7.50% |
Over Age 65 [Member] | OPEB [Member] | Consumers Energy Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Health care cost trend rate assumed for next fiscal year | 6.50% | 7.50% |
Remeasurement As Of July 1, 2013 [Member] | OPEB [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Deacrease in liability | 638 |  |
Regulatory asset decrease | 580 |  |
Increase in regulatory liabilities | 34 |  |
Decrease in AOCL | 24 |  |
Decrease deferred tax assets | 148 |  |
Reduced regulatory income tax liabilities | 144 |  |
Increased income tax expense | 4 |  |
Remeasurement As Of July 1, 2013 [Member] | OPEB [Member] | Consumers Energy Company [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Deacrease in liability | 614 |  |
Regulatory asset decrease | 580 |  |
Increase in regulatory liabilities | 34 |  |
Decrease deferred tax assets | 144 |  |
Reduced regulatory income tax liabilities | $ 144 |  |

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- Definition Participants in the plan include all regular full-time employees covered by the employee health care plan on the day before retirement at age 55 or older with at least ten full years of applicable continuous service. Regular full-time employees who qualify for Pension Plan disability retirement and have 15 years of applicable continuous service may also participate in the plan. + References No definition available. + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + 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 (b) -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 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=29635418&loc=d3e12355-114930 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + 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 (l) -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 -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 + Details
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