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Retirement Benefits | 9 Months Ended
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Sep. 30, 2011
Retirement Benefits | 10: RETIREMENT BENEFITS CMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees. Presented in the following tables are the costs and other changes in plan assets and benefit obligations incurred in CMS Energy's and Consumers' retirement benefits plans:
|  | In Millions |
|  | Pension |
|  | Three Months Ended |  |  | Nine Months Ended |
September 30 |  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic pension cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 12 |  |  | $ | 11 |  |  | $ | 36 |  |  | $ | 33 |
Interest expense |  |  | 25 |  |  |  | 25 |  |  |  | 75 |  |  |  | 74 |
Expected return on plan assets |  |  | (28 | ) |  |  | (24 | ) |  |  | (84 | ) |  |  | (70 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 16 |  |  |  | 13 |  |  |  | 47 |  |  |  | 39 |
Prior service cost |  |  | 1 |  |  |  | 1 |  |  |  | 4 |  |  |  | 4 |
Net periodic pension cost |  | $ | 26 |  |  | $ | 26 |  |  | $ | 78 |  |  | $ | 80 |
Regulatory adjustment1 |  |  | — |  |  |  | 7 |  |  |  | — |  |  |  | 30 |
Net periodic pension cost after regulatory adjustment |  | $ | 26 |  |  | $ | 33 |  |  | $ | 78 |  |  | $ | 110 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic pension cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 12 |  |  | $ | 11 |  |  | $ | 35 |  |  | $ | 32 |
Interest expense |  |  | 24 |  |  |  | 23 |  |  |  | 73 |  |  |  | 71 |
Expected return on plan assets |  |  | (27 | ) |  |  | (22 | ) |  |  | (82 | ) |  |  | (67 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 15 |  |  |  | 13 |  |  |  | 46 |  |  |  | 38 |
Prior service cost |  |  | 1 |  |  |  | 1 |  |  |  | 4 |  |  |  | 4 |
Net periodic pension cost |  | $ | 25 |  |  | $ | 26 |  |  | $ | 76 |  |  | $ | 78 |
Regulatory adjustment1 |  |  | — |  |  |  | 7 |  |  |  | — |  |  |  | 30 |
Net periodic pension cost after regulatory adjustment |  | $ | 25 |  |  | $ | 33 |  |  | $ | 76 |  |  | $ | 108 |
1 |  | Regulatory adjustments are the differences between amounts included in rates and the periodic benefit cost calculated. These regulatory adjustments were offset by surcharge revenues, resulting in no impact to net income for the periods presented.
CMS Energy's and Consumers' expected long-term rate of return on Pension Plan assets is eight percent. For the twelve months ended September 30, 2011, the actual return on Pension Plan assets was two percent, and for the twelve months ended September 30, 2010, the actual return was 11.6 percent. The expected rate of return is an assumption about long-term asset performance that CMS Energy and Consumers review annually for reasonableness and appropriateness.
In Millions |
|  | OPEB |
|  | Three Months Ended |  |  | Nine Months Ended |
September 30 |  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic OPEB cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 7 |  |  | $ | 7 |  |  | $ | 20 |  |  | $ | 20 |
Interest expense |  |  | 20 |  |  |  | 20 |  |  |  | 58 |  |  |  | 61 |
Expected return on plan assets |  |  | (17 | ) |  |  | (16 | ) |  |  | (50 | ) |  |  | (45 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 7 |  |  |  | 8 |  |  |  | 23 |  |  |  | 24 |
Prior service cost |  |  | (5 | ) |  |  | (5 | ) |  |  | (15 | ) |  |  | (12 | )
Net periodic OBEB cost |  | $ | 12 |  |  | $ | 14 |  |  | $ | 36 |  |  | $ | 48 |
Regulatory adjustment1 |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | 5 |
Net periodic OPEB cost after regulatory adjustment |  | $ | 12 |  |  | $ | 13 |  |  | $ | 36 |  |  | $ | 53 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic OPEB cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 7 |  |  | $ | 6 |  |  | $ | 20 |  |  | $ | 19 |
Interest expense |  |  | 19 |  |  |  | 19 |  |  |  | 56 |  |  |  | 59 |
Expected return on plan assets |  |  | (15 | ) |  |  | (14 | ) |  |  | (46 | ) |  |  | (42 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 7 |  |  |  | 8 |  |  |  | 23 |  |  |  | 24 |
Prior service cost |  |  | (5 | ) |  |  | (5 | ) |  |  | (15 | ) |  |  | (11 | )
Net periodic OPEB cost |  | $ | 13 |  |  | $ | 14 |  |  | $ | 38 |  |  | $ | 49 |
Regulatory adjustment1 |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | 5 |
Net periodic OPEB cost after regulatory adjustment |  | $ | 13 |  |  | $ | 13 |  |  | $ | 38 |  |  | $ | 54 |
1 |  | Regulatory adjustments are the differences between amounts included in rates and the periodic benefit cost calculated. These regulatory adjustments were offset by surcharge revenues, resulting in no impact to net income for the periods presented.
Consumers Energy Company [Member] |
Retirement Benefits | 10: RETIREMENT BENEFITS CMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees. Presented in the following tables are the costs and other changes in plan assets and benefit obligations incurred in CMS Energy's and Consumers' retirement benefits plans:
In Millions
|  | Pension
|  | Three Months Ended |  |  | Nine Months Ended
September 30 |  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic pension cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 12 |  |  | $ | 11 |  |  | $ | 36 |  |  | $ | 33 |
Interest expense |  |  | 25 |  |  |  | 25 |  |  |  | 75 |  |  |  | 74 |
Expected return on plan assets |  |  | (28 | ) |  |  | (24 | ) |  |  | (84 | ) |  |  | (70 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 16 |  |  |  | 13 |  |  |  | 47 |  |  |  | 39 |
Prior service cost |  |  | 1 |  |  |  | 1 |  |  |  | 4 |  |  |  | 4 |
Net periodic pension cost |  | $ | 26 |  |  | $ | 26 |  |  | $ | 78 |  |  | $ | 80 |
Regulatory adjustment1 |  |  | — |  |  |  | 7 |  |  |  | — |  |  |  | 30 |
Net periodic pension cost after regulatory adjustment |  | $ | 26 |  |  | $ | 33 |  |  | $ | 78 |  |  | $ | 110 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic pension cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 12 |  |  | $ | 11 |  |  | $ | 35 |  |  | $ | 32 |
Interest expense |  |  | 24 |  |  |  | 23 |  |  |  | 73 |  |  |  | 71 |
Expected return on plan assets |  |  | (27 | ) |  |  | (22 | ) |  |  | (82 | ) |  |  | (67 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 15 |  |  |  | 13 |  |  |  | 46 |  |  |  | 38 |
Prior service cost |  |  | 1 |  |  |  | 1 |  |  |  | 4 |  |  |  | 4 |
Net periodic pension cost |  | $ | 25 |  |  | $ | 26 |  |  | $ | 76 |  |  | $ | 78 |
Regulatory adjustment1 |  |  | — |  |  |  | 7 |  |  |  | — |  |  |  | 30 |
Net periodic pension cost after regulatory adjustment |  | $ | 25 |  |  | $ | 33 |  |  | $ | 76 |  |  | $ | 108 |
1 Regulatory adjustments are the differences between amounts included in rates and the periodic benefit cost calculated. These regulatory adjustments were offset by surcharge revenues, resulting in no impact to net income for the periods presented. CMS Energy's and Consumers' expected long-term rate of return on Pension Plan assets is eight percent. For the twelve months ended September 30, 2011, the actual return on Pension Plan assets was two percent, and for the twelve months ended September 30, 2010 the actual return was 11.6 percent. The expected rate of return is an assumption about long-term asset performance that CMS Energy and Consumers review annually for reasonableness and appropriateness.
In Millions
|  | OPEB
|  | Three Months Ended |  |  | Nine Months Ended
September 30 |  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
CMS Energy, including Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic OPEB cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 7 |  |  | $ | 7 |  |  | $ | 20 |  |  | $ | 20 |
Interest expense |  |  | 20 |  |  |  | 20 |  |  |  | 58 |  |  |  | 61 |
Expected return on plan assets |  |  | (17 | ) |  |  | (16 | ) |  |  | (50 | ) |  |  | (45 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 7 |  |  |  | 8 |  |  |  | 23 |  |  |  | 24 |
Prior service cost |  |  | (5 | ) |  |  | (5 | ) |  |  | (15 | ) |  |  | (12 | )
Net periodic OBEB cost |  | $ | 12 |  |  | $ | 14 |  |  | $ | 36 |  |  | $ | 48 |
Regulatory adjustment1 |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | 5 |
Net periodic OPEB cost after regulatory adjustment |  | $ | 12 |  |  | $ | 13 |  |  | $ | 36 |  |  | $ | 53 |
Consumers |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net periodic OPEB cost |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 7 |  |  | $ | 6 |  |  | $ | 20 |  |  | $ | 19 |
Interest expense |  |  | 19 |  |  |  | 19 |  |  |  | 56 |  |  |  | 59 |
Expected return on plan assets |  |  | (15 | ) |  |  | (14 | ) |  |  | (46 | ) |  |  | (42 | )
Amortization of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  | 7 |  |  |  | 8 |  |  |  | 23 |  |  |  | 24 |
Prior service cost |  |  | (5 | ) |  |  | (5 | ) |  |  | (15 | ) |  |  | (11 | )
Net periodic OPEB cost |  | $ | 13 |  |  | $ | 14 |  |  | $ | 38 |  |  | $ | 49 |
Regulatory adjustment1 |  |  | — |  |  |  | (1 | ) |  |  | — |  |  |  | 5 |
Net periodic OPEB cost after regulatory adjustment |  | $ | 13 |  |  | $ | 13 |  |  | $ | 38 |  |  | $ | 54 |
1 Regulatory adjustments are the differences between amounts included in rates and the periodic benefit cost calculated. These regulatory adjustments were offset by surcharge revenues, resulting in no impact to net income for the periods presented.

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS106-2 -Paragraph 20, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Implementation Guide (Q and A) -Number FAS88 -Paragraph 63 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher AICPA -Name Accounting Principles Board Opinion (APB) -Number 30 -Paragraph 26 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Emerging Issues Task Force (EITF) -Number 03-2 -Paragraph 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7, 8 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 8 -Subparagraph m -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph q -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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