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v2.4.1.9

Consolidated Statements Of Cash Flows (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2015 | Mar. 31, 2014
Cash Flows from Operating Activities |  |
Net income | $ 202 us-gaap_ProfitLoss | $ 204 us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities |  |
Depreciation and amortization | 222 us-gaap_DepreciationDepletionAndAmortization | 199 us-gaap_DepreciationDepletionAndAmortization
Deferred income taxes and investment tax credit | 99 us-gaap_DeferredIncomeTaxesAndTaxCredits | 102 us-gaap_DeferredIncomeTaxesAndTaxCredits
Postretirement benefits expense | 23 us-gaap_PensionAndOtherPostretirementBenefitExpense | 6 us-gaap_PensionAndOtherPostretirementBenefitExpense
Other non-cash operating activities | 19 us-gaap_OtherNoncashIncomeExpense | 19 us-gaap_OtherNoncashIncomeExpense
Postretirement benefits contributions | (31)us-gaap_PensionAndOtherPostretirementBenefitContributions | (2)us-gaap_PensionAndOtherPostretirementBenefitContributions
Cash provided by (used in) changes in assets and liabilities |  |
Decrease (increase) in accounts receivable, notes receivable, and accrued revenue | (48)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables | (313)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables
Decrease (increase) in inventories | 378 us-gaap_IncreaseDecreaseInInventories | 345 us-gaap_IncreaseDecreaseInInventories
Increase (decrease) in accounts payable and accrued refunds | (36)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities | 105 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Other current and non-current assets and liabilities | (68)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet | (54)us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet
Net cash provided by operating activities | 760 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations | 611 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash Flows from Investing Activities |  |
Capital expenditures (excludes assets placed under capital lease) | (348)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (304)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Cost to retire property | (10)us-gaap_PaymentsForProceedsFromRemovalCosts | (14)us-gaap_PaymentsForProceedsFromRemovalCosts
Increase in EnerBank notes receivable | (29)us-gaap_PaymentsForProceedsFromLoansReceivable | (29)us-gaap_PaymentsForProceedsFromLoansReceivable
Other investing activities | (35)us-gaap_PaymentsForProceedsFromOtherInvestingActivities | 1 us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities | (422)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations | (346)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash Flows from Financing Activities |  |
Proceeds from issuance of debt | 100 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 550 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Proceeds from EnerBank notes, net | 40 us-gaap_ProceedsFromRepaymentsOfNotesPayable | 16 us-gaap_ProceedsFromRepaymentsOfNotesPayable
Issuance of common stock | 4 us-gaap_ProceedsFromIssuanceOfCommonStock | 33 us-gaap_ProceedsFromIssuanceOfCommonStock
Retirement of long-term debt | (11)us-gaap_RepaymentsOfLongTermDebt | (26)us-gaap_RepaymentsOfLongTermDebt
Payment of dividends on common stock | (80)us-gaap_PaymentsOfDividendsCommonStock | (72)us-gaap_PaymentsOfDividendsCommonStock
Payment of capital lease obligations and other financing costs | (16)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | (10)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Increase (decrease) in notes payable | (60)us-gaap_ProceedsFromRepaymentsOfShortTermDebt | (170)us-gaap_ProceedsFromRepaymentsOfShortTermDebt
Net cash provided by (used in) financing activities | (23)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations | 321 us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net Increase (Decrease) in Cash and Cash Equivalents | 315 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 586 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and Cash Equivalents, Beginning of Period | 207 us-gaap_CashAndCashEquivalentsAtCarryingValue | 172 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and Cash Equivalents, End of Period | 522 us-gaap_CashAndCashEquivalentsAtCarryingValue | 758 us-gaap_CashAndCashEquivalentsAtCarryingValue
Non-Cash Transactions |  |
Capital expenditures not paid | 117 us-gaap_CapitalExpendituresIncurredButNotYetPaid | 116 us-gaap_CapitalExpendituresIncurredButNotYetPaid
Consumers Energy Company [Member] |  |
Cash Flows from Operating Activities |  |
Net income | 215 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 221 us-gaap_ProfitLoss / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Adjustments to reconcile net income to net cash provided by operating activities |  |
Depreciation and amortization | 220 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 197 us-gaap_DepreciationDepletionAndAmortization / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Deferred income taxes and investment tax credit | 39 us-gaap_DeferredIncomeTaxesAndTaxCredits / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 46 us-gaap_DeferredIncomeTaxesAndTaxCredits / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Postretirement benefits expense | 23 us-gaap_PensionAndOtherPostretirementBenefitExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 6 us-gaap_PensionAndOtherPostretirementBenefitExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Other non-cash operating activities | 17 us-gaap_OtherNoncashIncomeExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 16 us-gaap_OtherNoncashIncomeExpense / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Postretirement benefits contributions | (30)us-gaap_PensionAndOtherPostretirementBenefitContributions / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (1)us-gaap_PensionAndOtherPostretirementBenefitContributions / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Cash provided by (used in) changes in assets and liabilities |  |
Decrease (increase) in accounts receivable, notes receivable, and accrued revenue | (43)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (303)us-gaap_IncreaseDecreaseInAccountsAndOtherReceivables / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Decrease (increase) in inventories | 374 us-gaap_IncreaseDecreaseInInventories / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 338 us-gaap_IncreaseDecreaseInInventories / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Increase (decrease) in accounts payable and accrued refunds | (32)us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 108 us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Other current and non-current assets and liabilities | 3 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 18 us-gaap_IncreaseDecreaseInOtherOperatingCapitalNet / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Net cash provided by operating activities | 786 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 646 us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Cash Flows from Investing Activities |  |
Capital expenditures (excludes assets placed under capital lease) | (345)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (302)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Cost to retire property | (10)us-gaap_PaymentsForProceedsFromRemovalCosts / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (14)us-gaap_PaymentsForProceedsFromRemovalCosts / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Other investing activities | (28)us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 1 us-gaap_PaymentsForProceedsFromOtherInvestingActivities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Net cash used in investing activities | (383)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (315)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Cash Flows from Financing Activities |  |
Retirement of long-term debt | (11)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (11)us-gaap_RepaymentsOfLongTermDebt / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Payment of dividends on common stock | (122)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (135)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Stockholder contribution | 150 us-gaap_ProceedsFromContributedCapital / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 150 us-gaap_ProceedsFromContributedCapital / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Payment of capital lease obligations and other financing costs | (6)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (5)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Increase (decrease) in notes payable | (60)us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (170)us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Net cash provided by (used in) financing activities | (49)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | (171)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Net Increase (Decrease) in Cash and Cash Equivalents | 354 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 160 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Cash and Cash Equivalents, Beginning of Period | 71 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 18 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Cash and Cash Equivalents, End of Period | 425 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | 178 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember
Non-Cash Transactions |  |
Capital expenditures not paid | $ 117 us-gaap_CapitalExpendituresIncurredButNotYetPaid / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember | $ 116 us-gaap_CapitalExpendituresIncurredButNotYetPaid / dei_LegalEntityAxis = cms_ConsumersEnergyCompanyMember

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- Definition The net cash inflow or outflow from the costs of disposing of plant, whether by demolishing, dismantling, abandoning, sale, and so forth during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 25 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3536-108585 + Details
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- Definition The amount of pension and other (such as medical, dental and life insurance) postretirement benefit costs recognized during the period for (1) defined benefit plans (periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss) on assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments) and for (2) defined contribution plans (to the extent that a plan's defined contributions to an individual's account are to be made for periods in which that individual renders services, the net cost for a period is the contribution called for in that period; if a plan calls for contributions for periods after an individual retires or terminates, the estimated cost is accrued during the employee's service period). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.4) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 + Details
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- Definition The cash inflow associated with the amount received by a corporation from a shareholder during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from the additional capital contribution to the entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585 + Details
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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition Amount of cash inflow (outflow) from long-term debt supported by a written promise to pay an obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The net cash inflow or outflow for borrowing having initial term of repayment within one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4K -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 45 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (a),(c) -URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4J -URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686 + Details
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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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