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Retirement Benefits | 6 Months Ended
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Jun. 30, 2013
Retirement Benefits | 7:RETIREMENT BENEFITS CMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees unde r a number of different plans. Presented in the following table s are the costs incurred in CMS Energy’s and Consumers’ retirement benefits plans:
In Millions
| Pension |
| Three Months Ended |  | Six Months Ended |
June 30 | 2013 | 2012 |  | 2013 | 2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic pension cost |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 14 |  | $ | 12 |  |  | $ | 27 |  | $ | 24 |
Interest expense |  |  | 23 |  |  | 25 |  |  |  | 47 |  |  | 50 |
Expected return on plan assets |  |  | (32) |  |  | (32) |  |  |  | (64) |  |  | (63) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 24 |  |  | 19 |  |  |  | 48 |  |  | 38 |
Prior service cost |  |  | 1 |  |  | 2 |  |  |  | 2 |  |  | 3 |
Net periodic pension cost |  | $ | 30 |  | $ | 26 |  |  | $ | 60 |  | $ | 52 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic pension cost |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 13 |  | $ | 11 |  |  | $ | 26 |  | $ | 23 |
Interest expense |  |  | 23 |  |  | 24 |  |  |  | 46 |  |  | 48 |
Expected return on plan assets |  |  | (32) |  |  | (31) |  |  |  | (63) |  |  | (61) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 24 |  |  | 19 |  |  |  | 47 |  |  | 37 |
Prior service cost |  |  | 1 |  |  | 2 |  |  |  | 2 |  |  | 3 |
Net periodic pension cost |  | $ | 29 |  | $ | 25 |  |  | $ | 58 |  | $ | 50 |
In Millions
| OPEB |
| Three Months Ended |  | Six Months Ended |
June 30 | 2013 | 2012 |  | 2013 | 2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic OPEB cost |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 9 |  | $ | 8 |  |  | $ | 18 |  | $ | 16 |
Interest expense |  |  | 19 |  |  | 20 |  |  |  | 38 |  |  | 41 |
Expected return on plan assets |  |  | (19) |  |  | (16) |  |  |  | (38) |  |  | (33) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 10 |  |  | 12 |  |  |  | 21 |  |  | 23 |
Prior service credit |  |  | (5) |  |  | (5) |  |  |  | (10) |  |  | (10) |
Net periodic OPEB cost |  | $ | 14 |  | $ | 19 |  |  | $ | 29 |  | $ | 37 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic OPEB cost |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 9 |  | $ | 8 |  |  | $ | 18 |  | $ | 16 |
Interest expense |  |  | 18 |  |  | 20 |  |  |  | 36 |  |  | 40 |
Expected return on plan assets |  |  | (17) |  |  | (16) |  |  |  | (35) |  |  | (31) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 10 |  |  | 12 |  |  |  | 21 |  |  | 23 |
Prior service credit |  |  | (5) |  |  | (5) |  |  |  | (10) |  |  | (10) |
Net periodic OPEB cost |  | $ | 15 |  | $ | 19 |  |  | $ | 30 |  | $ | 38 |
Effective July 1, 2013, CMS Energy and Consumers changed the Medicare drug program provided through their OPEB Plan from an employer-sponsored prescription drug plan with a retiree drug subsidy to an EGWP to begin on January 1, 2015. Also effective July 1, 2013, the OPEB Plan incorporated certain benefit changes to begin on January 1, 2016. Accordingly, CMS Energy and Consumers performed a remeasurement of the OPEB Plan as of July 1, 2013. In addition, with the plan remeasurement, the discount rate used to measure the liability was increased from 4.4 percent at December 31, 2012 to 5.1 percent at July 1, 2013. Assumptions regarding the expected long-term rate of return on plan assets and the health-care cost trend rate did not change from December 31, 2012 levels.
Consumers Energy Company [Member] |
Retirement Benefits | 7:RETIREMENT BENEFITS CMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees unde r a number of different plans. Presented in the following table s are the costs incurred in CMS Energy’s and Consumers’ retirement benefits plans:
In Millions
| Pension |
| Three Months Ended |  | Six Months Ended |
June 30 | 2013 | 2012 |  | 2013 | 2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic pension cost |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 14 |  | $ | 12 |  |  | $ | 27 |  | $ | 24 |
Interest expense |  |  | 23 |  |  | 25 |  |  |  | 47 |  |  | 50 |
Expected return on plan assets |  |  | (32) |  |  | (32) |  |  |  | (64) |  |  | (63) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 24 |  |  | 19 |  |  |  | 48 |  |  | 38 |
Prior service cost |  |  | 1 |  |  | 2 |  |  |  | 2 |  |  | 3 |
Net periodic pension cost |  | $ | 30 |  | $ | 26 |  |  | $ | 60 |  | $ | 52 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic pension cost |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 13 |  | $ | 11 |  |  | $ | 26 |  | $ | 23 |
Interest expense |  |  | 23 |  |  | 24 |  |  |  | 46 |  |  | 48 |
Expected return on plan assets |  |  | (32) |  |  | (31) |  |  |  | (63) |  |  | (61) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 24 |  |  | 19 |  |  |  | 47 |  |  | 37 |
Prior service cost |  |  | 1 |  |  | 2 |  |  |  | 2 |  |  | 3 |
Net periodic pension cost |  | $ | 29 |  | $ | 25 |  |  | $ | 58 |  | $ | 50 |
In Millions
| OPEB |
| Three Months Ended |  | Six Months Ended |
June 30 | 2013 | 2012 |  | 2013 | 2012 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic OPEB cost |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 9 |  | $ | 8 |  |  | $ | 18 |  | $ | 16 |
Interest expense |  |  | 19 |  |  | 20 |  |  |  | 38 |  |  | 41 |
Expected return on plan assets |  |  | (19) |  |  | (16) |  |  |  | (38) |  |  | (33) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 10 |  |  | 12 |  |  |  | 21 |  |  | 23 |
Prior service credit |  |  | (5) |  |  | (5) |  |  |  | (10) |  |  | (10) |
Net periodic OPEB cost |  | $ | 14 |  | $ | 19 |  |  | $ | 29 |  | $ | 37 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic OPEB cost |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 9 |  | $ | 8 |  |  | $ | 18 |  | $ | 16 |
Interest expense |  |  | 18 |  |  | 20 |  |  |  | 36 |  |  | 40 |
Expected return on plan assets |  |  | (17) |  |  | (16) |  |  |  | (35) |  |  | (31) |
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 10 |  |  | 12 |  |  |  | 21 |  |  | 23 |
Prior service credit |  |  | (5) |  |  | (5) |  |  |  | (10) |  |  | (10) |
Net periodic OPEB cost |  | $ | 15 |  | $ | 19 |  |  | $ | 30 |  | $ | 38 |
Effective July 1, 2013, CMS Energy and Consumers changed the Medicare drug program provided through their OPEB Plan from an employer-sponsored prescription drug plan with a retiree drug subsidy to an EGWP to begin on January 1, 2015. Also effective July 1, 2013, the OPEB Plan incorporated certain benefit changes to begin on January 1, 2016. Accordingly, CMS Energy and Consumers performed a remeasurement of the OPEB Plan as of July 1, 2013. In addition, with the plan remeasurement, the discount rate used to measure the liability was increased from 4.4 percent at December 31, 2012 to 5.1 percent at July 1, 2013. Assumptions regarding the expected long-term rate of return on plan assets and the health-care cost trend rate did not change from December 31, 2012 levels.

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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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