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Related Party Transactions - Consumers (Tables) (Consumers Energy Company [Member]) | 12 Months Ended
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Dec. 31, 2012
Consumers Energy Company [Member] |
Schedule of Related Party Transactions, by Related Party Table |
In Millions
Description | Related Party | 2012 | 2011 | 2010 |
Purchases of capacity and energy | Affiliates of CMS Enterprises |  | $ | 86 |  | $ | 81 |  | $ | 84 |

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- Definition Tabular disclosure of related party transactions. Examples of related party transactions include, but are not limited to, transactions between (a) a parent company and its subsidiary; (b) subsidiaries of a common parent; (c) and entity and its principal owners and (d) affiliates. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration