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Retirement Benefits | 3 Months Ended
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Mar. 31, 2014
Retirement Benefits | 7:RETIREMENT BENEFITS CMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees under a number of different plans. Presented in the following table are the costs (credits) and other changes in plan assets and benefit obligations incurred in CMS Energy’s and Consumers’ retirement benefits plans:
In Millions
| Pension |  | OPEB |
Three Months Ended March 31 | 2014 | 2013 | 2014 | 2013 |
CMS Energy, including Consumers |
Net periodic cost (credit) |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 10 |  | $ | 13 |  | $ | 5 |  | $ | 9 |
Interest expense |  |  | 25 |  |  | 24 |  |  | 14 |  |  | 19 |
Expected return on plan assets |  |  | (34) |  |  | (32) |  |  | (22) |  |  | (19) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 15 |  |  | 24 |  |  | - |  |  | 11 |
Prior service cost (credit) |  |  | - |  |  | 1 |  |  | (10) |  |  | (5) |
Net periodic cost (credit) |  | $ | 16 |  | $ | 30 |  | $ | (13) |  | $ | 15 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic cost (credit) |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 10 |  | $ | 13 |  | $ | 5 |  | $ | 9 |
Interest expense |  |  | 24 |  |  | 23 |  |  | 13 |  |  | 18 |
Expected return on plan assets |  |  | (33) |  |  | (31) |  |  | (21) |  |  | (18) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 14 |  |  | 23 |  |  | 1 |  |  | 11 |
Prior service cost (credit) |  |  | - |  |  | 1 |  |  | (10) |  |  | (5) |
Net periodic cost (credit) |  | $ | 15 |  | $ | 29 |  | $ | (12) |  | $ | 15 |
Consumers Energy Company [Member] |
Retirement Benefits | 7:RETIREMENT BENEFITS CMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees under a number of different plans. Presented in the following table are the costs (credits) and other changes in plan assets and benefit obligations incurred in CMS Energy’s and Consumers’ retirement benefits plans:
In Millions
| Pension |  | OPEB |
Three Months Ended March 31 | 2014 | 2013 | 2014 | 2013 |
CMS Energy, including Consumers |
Net periodic cost (credit) |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 10 |  | $ | 13 |  | $ | 5 |  | $ | 9 |
Interest expense |  |  | 25 |  |  | 24 |  |  | 14 |  |  | 19 |
Expected return on plan assets |  |  | (34) |  |  | (32) |  |  | (22) |  |  | (19) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 15 |  |  | 24 |  |  | - |  |  | 11 |
Prior service cost (credit) |  |  | - |  |  | 1 |  |  | (10) |  |  | (5) |
Net periodic cost (credit) |  | $ | 16 |  | $ | 30 |  | $ | (13) |  | $ | 15 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic cost (credit) |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 10 |  | $ | 13 |  | $ | 5 |  | $ | 9 |
Interest expense |  |  | 24 |  |  | 23 |  |  | 13 |  |  | 18 |
Expected return on plan assets |  |  | (33) |  |  | (31) |  |  | (21) |  |  | (18) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 14 |  |  | 23 |  |  | 1 |  |  | 11 |
Prior service cost (credit) |  |  | - |  |  | 1 |  |  | (10) |  |  | (5) |
Net periodic cost (credit) |  | $ | 15 |  | $ | 29 |  | $ | (12) |  | $ | 15 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration