XML 40 R31.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Retirement Benefits (Tables) | 3 Months Ended
--- | ---
Mar. 31, 2012
Schedule of Net Benefit Costs |
In Millions |
|  | Pension |
Three Months Ended March 31 |  | 2012 |  |  | 2011 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |
Net periodic pension cost |  |  |  |  |  |  |  |
Service cost |  | $ | 12 |  |  | $ | 12 |
Interest expense |  |  | 25 |  |  |  | 25 |
Expected return on plan assets |  |  | (31 | ) |  |  | (28 | )
Amortization of: |  |  |  |  |  |  |  |
Net loss |  |  | 19 |  |  |  | 16 |
Prior service cost |  |  | 1 |  |  |  | 1 |
Net periodic pension cost |  | $ | 26 |  |  | $ | 26 |
CONSUMERS |  |  |  |  |  |  |  |
Net periodic pension cost |  |  |  |  |  |  |  |
Service cost |  | $ | 12 |  |  | $ | 12 |
Interest expense |  |  | 24 |  |  |  | 24 |
Expected return on plan assets |  |  | (30 | ) |  |  | (27 | )
Amortization of: |  |  |  |  |  |  |  |
Net loss |  |  | 18 |  |  |  | 15 |
Prior service cost |  |  | 1 |  |  |  | 1 |
Net periodic pension cost |  | $ | 25 |  |  | $ | 25 |
|  | In Millions |
|  | OPEB |
Three Months Ended March 31 |  | 2012 |  |  | 2011 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |
Net periodic OPEB cost |  |  |  |  |  |  |  |
Service cost |  | $ | 8 |  |  | $ | 7 |
Interest expense |  |  | 21 |  |  |  | 19 |
Expected return on plan assets |  |  | (17 | ) |  |  | (17 | )
Amortization of: |  |  |  |  |  |  |  |
Net loss |  |  | 11 |  |  |  | 8 |
Prior service credit |  |  | (5 | ) |  |  | (5 | )
Net periodic OPEB cost |  | $ | 18 |  |  | $ | 12 |
CONSUMERS |  |  |  |  |  |  |  |
Net periodic OPEB cost |  |  |  |  |  |  |  |
Service cost |  | $ | 8 |  |  | $ | 6 |
Interest expense |  |  | 20 |  |  |  | 18 |
Expected return on plan assets |  |  | (15 | ) |  |  | (15 | )
Amortization of: |  |  |  |  |  |  |  |
Net loss |  |  | 11 |  |  |  | 8 |
Prior service credit |  |  | (5 | ) |  |  | (5 | )
Net periodic OPEB cost |  | $ | 19 |  |  | $ | 12 |
Consumers Energy Company [Member] |
Schedule of Net Benefit Costs |
|  | In Millions |
|  | Pension |
Three Months Ended March 31 |  | 2012 |  |  | 2011 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |
Net periodic pension cost |  |  |  |  |  |  |  |
Service cost |  | $ | 12 |  |  | $ | 12 |
Interest expense |  |  | 25 |  |  |  | 25 |
Expected return on plan assets |  |  | (31 | ) |  |  | (28 | )
Amortization of: |  |  |  |  |  |  |  |
Net loss |  |  | 19 |  |  |  | 16 |
Prior service cost |  |  | 1 |  |  |  | 1 |
Net periodic pension cost |  | $ | 26 |  |  | $ | 26 |
CONSUMERS |  |  |  |  |  |  |  |
Net periodic pension cost |  |  |  |  |  |  |  |
Service cost |  | $ | 12 |  |  | $ | 12 |
Interest expense |  |  | 24 |  |  |  | 24 |
Expected return on plan assets |  |  | (30 | ) |  |  | (27 | )
Amortization of: |  |  |  |  |  |  |  |
Net loss |  |  | 18 |  |  |  | 15 |
Prior service cost |  |  | 1 |  |  |  | 1 |
Net periodic pension cost |  | $ | 25 |  |  | $ | 25 |
|  | In Millions |
|  | OPEB |
Three Months Ended March 31 |  | 2012 |  |  | 2011 |
CMS ENERGY, INCLUDING CONSUMERS |  |  |  |  |  |  |  |
Net periodic OPEB cost |  |  |  |  |  |  |  |
Service cost |  | $ | 8 |  |  | $ | 7 |
Interest expense |  |  | 21 |  |  |  | 19 |
Expected return on plan assets |  |  | (17 | ) |  |  | (17 | )
Amortization of: |  |  |  |  |  |  |  |
Net loss |  |  | 11 |  |  |  | 8 |
Prior service credit |  |  | (5 | ) |  |  | (5 | )
Net periodic OPEB cost |  | $ | 18 |  |  | $ | 12 |
CONSUMERS |  |  |  |  |  |  |  |
Net periodic OPEB cost |  |  |  |  |  |  |  |
Service cost |  | $ | 8 |  |  | $ | 6 |
Interest expense |  |  | 20 |  |  |  | 18 |
Expected return on plan assets |  |  | (15 | ) |  |  | (15 | )
Amortization of: |  |  |  |  |  |  |  |
Net loss |  |  | 11 |  |  |  | 8 |
Prior service credit |  |  | (5 | ) |  |  | (5 | )
Net periodic OPEB cost |  | $ | 19 |  |  | $ | 12 |

X
- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
Name: | us-gaap_ScheduleOfNetBenefitCostsTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration