XML 111 R103.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Retirement Benefits (Schedule of Expected Benefit Payments) (Details) (USD $) In Millions, unless otherwise specified | Dec. 31, 2012
--- | ---
Pension Plans, Defined Benefit [Member] |  |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | $ 120 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Two | 128 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Three | 138 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Four | 144 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Five | 149 |
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter | 793 |
Pension Plans, Defined Benefit [Member] | Consumers Energy Company [Member] |  |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | 117 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Two | 125 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Three | 134 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Four | 140 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Five | 146 |
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter | 773 |
Supplemental Executive Retirement Plan [Member] |  |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | 7 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Two | 8 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Three | 8 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Four | 8 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Five | 8 |
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter | 46 |
Supplemental Executive Retirement Plan [Member] | Consumers Energy Company [Member] |  |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | 4 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Two | 4 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Three | 4 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Four | 4 |
Defined Benefit Plan, Expected Future Benefit Payments, Year Five | 4 |
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter | 20 |
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | 61 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Year Two | 65 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Year Three | 70 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Year Four | 74 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Year Five | 79 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter | 451 | [1]
Prescription Drug Subsidy Receipts, Next Twelve Months | 6 |
Prescription Drug Subsidy Receipts, Year Two | 7 |
Prescription Drug Subsidy Receipts, Year Three | 7 |
Prescription Drug Subsidy Receipts, Year Four | 8 |
Prescription Drug Subsidy Receipts, Year Five | 8 |
Prescription Drug Subsidy Receipts, after Year Five | 51 |
Other Postretirement Benefit Plans, Defined Benefit [Member] | Consumers Energy Company [Member] |  |
Defined Benefit Plan, Expected Future Benefit Payments, Next Twelve Months | 59 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Year Two | 63 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Year Three | 67 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Year Four | 71 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Year Five | 76 | [1]
Defined Benefit Plan, Expected Future Benefit Payments, Five Fiscal Years Thereafter | 432 | [1]
Prescription Drug Subsidy Receipts, Next Twelve Months | 6 |
Prescription Drug Subsidy Receipts, Year Two | 6 |
Prescription Drug Subsidy Receipts, Year Three | 7 |
Prescription Drug Subsidy Receipts, Year Four | 7 |
Prescription Drug Subsidy Receipts, Year Five | 8 |
Prescription Drug Subsidy Receipts, after Year Five | $ 48 |
[1] | CMS Energy’s and Consumers’ OPEB benefit payments are net of employee contributions and expected Medicare Part D prescription drug subsidy payments. For CMS Energy, subsidies to be received are estimated to be $6 million for 2013, $7 million for each of 2014 and 2015, $8 million for each of 2016 and 2017, and $51 million combined for 2018 through 2022. For Consumers, subsidies to be received are estimated to be $6 million for each of 2013 and 2014, $7 million for each of 2015 and 2016, $8 million for 2017, and $48 million combined for 2018 through 2022.

X
- Definition Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of the prescription drug subsidy receipts to be received after the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_PrescriptionDrugSubsidyReceiptsAfterYearFive
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of the prescription drug subsidy receipts to be received in the next fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_PrescriptionDrugSubsidyReceiptsNextTwelveMonths
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of the prescription drug subsidy receipts to be received in the fifth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_PrescriptionDrugSubsidyReceiptsYearFive1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of the prescription drug subsidy receipts to be received in the fourth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_PrescriptionDrugSubsidyReceiptsYearFour1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of the prescription drug subsidy receipts to be received in the third fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_PrescriptionDrugSubsidyReceiptsYearThree1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of the prescription drug subsidy receipts to be received in the second fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
Name: | us-gaap_PrescriptionDrugSubsidyReceiptsYearTwo1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant