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Stock-Based Compensation (Narrative) (Details) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2015 USD ($) shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Deferred Compensation Arrangements Plan Term | 10 years
Number of shares authorized | 6,500,000
Maximum shares issuable per employee | 500,000
Shares available for grant | 5,611,442
Tax benefits recognized in equity | $ | $ 1
Unrealized Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation | $ | $ 33
Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Deferred Compensation Arrangements Plan Term | 10 years
Number of shares authorized | 6,500,000
Maximum shares issuable per employee | 500,000
Shares available for grant | 5,611,442
Minimum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percent of Initial Grant Issued on Vesting Date | 0.00%
Minimum [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percent of Initial Grant Issued on Vesting Date | 0.00%
Maximum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percent of Initial Grant Issued on Vesting Date | 200.00%
Maximum [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Percent of Initial Grant Issued on Vesting Date | 200.00%
Performance-Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Service period | 38 months
Vesting period | 3 years
Performance-Based Restricted Stock [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Service period | 38 months
Vesting period | 3 years
Performance-Based Restricted Stock [Member] | Minimum [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Service period | 36 months
Performance-Based Restricted Stock [Member] | Minimum [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Service period | 36 months
Market-Based Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Service period | 3 years
Market-Based Restricted Stock [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Service period | 3 years
Time-Lapsed Restricted Stock [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 3 years
Time-Lapsed Restricted Stock [Member] | Consumers Energy Company [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Vesting period | 3 years
Restricted Stock Units (RSUs) [Member] |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
Service period | 1 year
Shares vested | 0
Shares forfeited | 0

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- Definition Percentage of initial grant of equity-based compensation awards earned depending on the outcome of the market condition. + References No definition available. + Details
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- Definition Amount of increase in additional paid in capital (APIC) resulting from a tax benefit associated with share-based compensation plan other than an employee stock ownership plan (ESOP). Includes, but is not limited to, excess tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6419406&loc=d3e23524-113945 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 + Details
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