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Asset Retirement Obligations (Tables) | 12 Months Ended
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Dec. 31, 2012
Schedule of Change in Asset Retirement Obligation Table |
In Millions
| ARO |  |  |  |  |  |  |  |  |  |  |  |  | ARO |
| Liability |  |  |  |  |  |  |  |  |  | Cash flow | Liability |
Company and ARO Description | 12/31/2011 | Incurred | Settled1 | Accretion | Revisions | 12/31/2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gas treating plant and gas wells |  | $ | 1 |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | 1 |
Consumers |  |  | 253 |  |  | 7 |  |  | (8) |  |  | 19 |  |  | 40 |  |  | 311 |
Total CMS Energy |  | $ | 254 |  | $ | 7 |  | $ | (8) |  | $ | 19 |  | $ | 40 |  | $ | 312 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coal ash disposal areas |  | $ | 70 |  | $ | - |  | $ | (3) |  | $ | 7 |  | $ | 40 |  | $ | 114 |
Wells at gas storage fields |  |  | 1 |  |  | - |  |  | (1) |  |  | - |  |  | - |  |  | - |
Asbestos abatement |  |  | 42 |  |  | - |  |  | (1) |  |  | 2 |  |  | - |  |  | 43 |
Gas distribution cut, purge, and cap |  |  | 140 |  |  | 4 |  |  | (3) |  |  | 10 |  |  | - |  |  | 151 |
Wind farm |  |  | - |  |  | 3 |  |  | - |  |  | - |  |  | - |  |  | 3 |
Total Consumers |  | $ | 253 |  | $ | 7 |  | $ | (8) |  | $ | 19 |  | $ | 40 |  | $ | 311 |
In Millions
| ARO |  |  |  |  |  |  |  |  |  |  |  |  | ARO |
| Liability |  |  |  |  |  |  |  |  |  | Cash flow | Liability |
Company and ARO Description | 12/31/2010 | Incurred | Settled1 | Accretion | Revisions | 12/31/2011 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gas treating plant and gas wells |  | $ | 1 |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | 1 |
Consumers |  |  | 244 |  |  | (2) |  |  | (7) |  |  | 18 |  |  | - |  |  | 253 |
Total CMS Energy |  | $ | 245 |  | $ | (2) |  | $ | (7) |  | $ | 18 |  | $ | - |  | $ | 254 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coal ash disposal areas |  | $ | 66 |  | $ | - |  | $ | (2) |  | $ | 6 |  | $ | - |  | $ | 70 |
Wells at gas storage fields |  |  | 1 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 1 |
Indoor gas services relocations |  |  | 1 |  |  | - |  |  | (1) |  |  | - |  |  | - |  |  | - |
Asbestos abatement |  |  | 40 |  |  | - |  |  | (1) |  |  | 3 |  |  | - |  |  | 42 |
Gas distribution cut, purge, and cap |  |  | 136 |  |  | (2) |  |  | (3) |  |  | 9 |  |  | - |  |  | 140 |
Total Consumers |  | $ | 244 |  | $ | (2) |  | $ | (7) |  | $ | 18 |  | $ | - |  | $ | 253 |
1 Cash payments of $8 million in 2012 and $7 million in 2011 were included in other current and non-current assets and liabilities as a component of net cash provided by operating activities in CMS Energy’s and Consumers’ consolidated statements of cash flow.
Consumers Energy Company [Member] |
Schedule of Change in Asset Retirement Obligation Table |
In Millions
| ARO |  |  |  |  |  |  |  |  |  |  |  |  | ARO |
| Liability |  |  |  |  |  |  |  |  |  | Cash flow | Liability |
Company and ARO Description | 12/31/2011 | Incurred | Settled1 | Accretion | Revisions | 12/31/2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gas treating plant and gas wells |  | $ | 1 |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | 1 |
Consumers |  |  | 253 |  |  | 7 |  |  | (8) |  |  | 19 |  |  | 40 |  |  | 311 |
Total CMS Energy |  | $ | 254 |  | $ | 7 |  | $ | (8) |  | $ | 19 |  | $ | 40 |  | $ | 312 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coal ash disposal areas |  | $ | 70 |  | $ | - |  | $ | (3) |  | $ | 7 |  | $ | 40 |  | $ | 114 |
Wells at gas storage fields |  |  | 1 |  |  | - |  |  | (1) |  |  | - |  |  | - |  |  | - |
Asbestos abatement |  |  | 42 |  |  | - |  |  | (1) |  |  | 2 |  |  | - |  |  | 43 |
Gas distribution cut, purge, and cap |  |  | 140 |  |  | 4 |  |  | (3) |  |  | 10 |  |  | - |  |  | 151 |
Wind farm |  |  | - |  |  | 3 |  |  | - |  |  | - |  |  | - |  |  | 3 |
Total Consumers |  | $ | 253 |  | $ | 7 |  | $ | (8) |  | $ | 19 |  | $ | 40 |  | $ | 311 |
In Millions
| ARO |  |  |  |  |  |  |  |  |  |  |  |  | ARO |
| Liability |  |  |  |  |  |  |  |  |  | Cash flow | Liability |
Company and ARO Description | 12/31/2010 | Incurred | Settled1 | Accretion | Revisions | 12/31/2011 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gas treating plant and gas wells |  | $ | 1 |  | $ | - |  | $ | - |  | $ | - |  | $ | - |  | $ | 1 |
Consumers |  |  | 244 |  |  | (2) |  |  | (7) |  |  | 18 |  |  | - |  |  | 253 |
Total CMS Energy |  | $ | 245 |  | $ | (2) |  | $ | (7) |  | $ | 18 |  | $ | - |  | $ | 254 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Coal ash disposal areas |  | $ | 66 |  | $ | - |  | $ | (2) |  | $ | 6 |  | $ | - |  | $ | 70 |
Wells at gas storage fields |  |  | 1 |  |  | - |  |  | - |  |  | - |  |  | - |  |  | 1 |
Indoor gas services relocations |  |  | 1 |  |  | - |  |  | (1) |  |  | - |  |  | - |  |  | - |
Asbestos abatement |  |  | 40 |  |  | - |  |  | (1) |  |  | 3 |  |  | - |  |  | 42 |
Gas distribution cut, purge, and cap |  |  | 136 |  |  | (2) |  |  | (3) |  |  | 9 |  |  | - |  |  | 140 |
Total Consumers |  | $ | 244 |  | $ | (2) |  | $ | (7) |  | $ | 18 |  | $ | - |  | $ | 253 |
1 Cash payments of $8 million in 2012 and $7 million in 2011 were included in other current and non-current assets and liabilities as a component of net cash provided by operating activities in CMS Energy’s and Consumers’ consolidated statements of cash flow.

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- Definition Tabular disclosure of the changes in carrying amount of a liability for asset retirement obligations, for changes such as new obligations, changes in estimates of existing obligations, spending on existing obligations, property dispositions, and foreign currency translation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13201-110859 + Details
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Namespace Prefix: | us-gaap_
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Period Type: | duration