CMS Energy Corporation 5.875% J (CMS) 10-Q 23 Jul 15 2015 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2015	Jul. 07, 2015
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2015
Document Fiscal Period Focus	Q2
Document Fiscal Year Focus	2,015
Trading Symbol	cms
Entity Registrant Name	CMS Energy Corporation
Entity Central Index Key	811,156
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
CMS Energy [Member]
Entity Common Stock, Shares Outstanding		277,472,000
Consumers Energy Company [Member]
Entity Registrant Name	Consumers Energy Company
Entity Central Index Key	201,533
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		84,108,789

Consolidated Statements Of Inco

Consolidated Statements Of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Operating Revenue	$ 1,350	$ 1,468	$ 3,461	$ 3,991
Operating Expenses
Fuel for electric generation	134	154	301	373
Purchased and interchange power	341	359	690	857
Purchased power - related parties	17	22	40	46
Cost of gas sold	113	187	702	1,021
Maintenance and other operating expenses	312	304	595	570
Depreciation and amortization	169	151	391	350
General taxes	60	56	141	131
Total operating expenses	1,146	1,233	2,860	3,348
Operating Income	204	235	601	643
Other Income (Expense)
Interest income	1	1	2	1
Allowance for equity funds used during construction	2	2	4	4
Income from equity method investees	1	3	5	7
Other income	3	3	6	6
Other expense	(4)	(16)	(8)	(23)
Total other income (expense)	3	(7)	9	(5)
Interest Charges
Interest on long-term debt	97	99	193	196
Other interest expense	7	3	13	8
Allowance for borrowed funds used during construction	(1)	(1)	(2)	(2)
Total interest charges	103	101	204	202
Income (Loss) Before Income Taxes	104	127	406	436
Income Tax Expense (Benefit)	36	43	136	148
Net Income (Loss)	68	84	270	288
Income attributable to noncontrolling interests	1	1	1	1
Net Income (Loss) Available to Common Stockholders	$ 67	$ 83	$ 269	$ 287
Basic Earnings Per Average Common Share	$ 0.25	$ 0.31	$ 0.98	$ 1.07
Diluted Earnings Per Average Common Share	0.25	0.30	0.98	1.05
Dividends declared per common share	$ 0.29	$ 0.27	$ 0.58	$ 0.54
Consumers Energy Company [Member]
Operating Revenue	$ 1,281	$ 1,387	$ 3,309	$ 3,769
Operating Expenses
Fuel for electric generation	110	132	243	318
Purchased and interchange power	337	348	683	832
Purchased power - related parties	17	22	40	46
Cost of gas sold	108	167	691	935
Maintenance and other operating expenses	291	288	556	538
Depreciation and amortization	168	149	388	346
General taxes	58	54	137	128
Total operating expenses	1,089	1,160	2,738	3,143
Operating Income	192	227	571	626
Other Income (Expense)
Interest income	1	1	2	1
Allowance for equity funds used during construction	2	2	4	4
Other income	3	3	15	6
Other expense	(4)	(4)	(8)	(10)
Total other income (expense)	2	2	13	1
Interest Charges
Interest on long-term debt	63	59	126	118
Other interest expense	4	2	7	5
Allowance for borrowed funds used during construction	(1)	(1)	(2)	(2)
Total interest charges	66	60	131	121
Income (Loss) Before Income Taxes	128	169	453	506
Income Tax Expense (Benefit)	44	60	154	176
Net Income (Loss)	84	109	299	330
Preferred Stock Dividends and Distribution	1	1	1	1
Net Income Attributable to Common Stockholder	$ 83	$ 108	$ 298	$ 329

Consolidated Statements Of Comp

Consolidated Statements Of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net Income (Loss)	$ 68	$ 84	$ 270	$ 288
Retirement Benefits Liability
Amortization of net actuarial loss, net of tax	1	1	2	1
Investments
Unrealized gain (loss) on investments, net of tax	(1)		(1)
Derivative Instruments
Reclassification adjustments included in net income, net of tax				1
Other Comprehensive Income (Loss)		1	1	2
Comprehensive Income	68	85	271	290
Comprehensive Income Attributable to Noncontrolling Interest	1	1	1	1
Comprehensive Income Attributable to CMS Energy	67	84	270	289
Consumers Energy Company [Member]
Net Income (Loss)	84	109	299	330
Retirement Benefits Liability
Amortization of net actuarial loss, net of tax	1	1	2	1
Investments
Unrealized gain (loss) on investments, net of tax	(2)	1	(2)	3
Reclassification adjustments included in net income, net of tax			(5)
Derivative Instruments
Other Comprehensive Income (Loss)	(1)	2	(5)	4
Comprehensive Income Attributable to CMS Energy	$ 83	$ 111	$ 294	$ 334

Consolidated Statements Of Com4

Consolidated Statements Of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Amortization of net actuarial loss, tax	$ 1	$ 1	$ 2	$ 1
Unrealized gain (loss) on investments, tax expense (tax benefit)
Reclassification adjustments included in net income (loss), tax
Consumers Energy Company [Member]
Amortization of net actuarial loss, tax	$ 1		$ 1
Unrealized gain (loss) on investments, tax expense (tax benefit)	$ (1)	$ 1	(1)	$ 2
Reclassification adjustments included in net income, tax			$ (3)

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Cash Flows from Operating Activities
Net income	$ 270	$ 288
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	391	350
Deferred income taxes and investment tax credit	135	137
Postretirement benefits expense	45	11
Other non-cash operating activities	39	38
Postretirement benefits contributions	(33)	(4)
Cash provided by (used in) changes in assets and liabilities
Decrease (increase) in accounts receivable, notes receivable, and accrued revenue	194	(14)
Decrease (increase) in inventories	235	108
Increase (decrease) in accounts payable and accrued refunds	(35)	2
Other current and non-current assets and liabilities	21	21
Net cash provided by operating activities	1,262	937
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under capital lease)	(675)	(663)
Cost to retire property	(26)	(36)
Increase in EnerBank notes receivable	(99)	(86)
Proceeds from the sale of EnerBank notes receivable	48
Other investing activities	(30)	2
Net cash used in investing activities	(782)	(783)
Cash Flows from Financing Activities
Proceeds from issuance of debt	100	550
Proceeds from EnerBank notes, net	39	78
Issuance of common stock	27	37
Retirement of long-term debt	(137)	(301)
Payment of dividends on common and preferred stock	(161)	(146)
Increase (decrease) in notes payable	(60)	(170)
Payment of capital lease obligations and other financing costs	(18)	(16)
Net cash provided by (used in) financing activities	(210)	32
Net Increase (Decrease) in Cash and Cash Equivalents	270	186
Cash and Cash Equivalents, Beginning of Period	207	172
Cash and Cash Equivalents, End of Period	477	358
Non-Cash Transactions
Capital expenditures not paid	148	170
Consumers Energy Company [Member]
Cash Flows from Operating Activities
Net income	299	330
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	388	346
Deferred income taxes and investment tax credit	24	66
Postretirement benefits expense	45	12
Other non-cash operating activities	33	32
Postretirement benefits contributions	(31)	(2)
Cash provided by (used in) changes in assets and liabilities
Decrease (increase) in accounts receivable, notes receivable, and accrued revenue	195	(6)
Decrease (increase) in inventories	233	101
Increase (decrease) in accounts payable and accrued refunds	(34)	10
Other current and non-current assets and liabilities	99	27
Net cash provided by operating activities	1,251	916
Cash Flows from Investing Activities
Capital expenditures (excludes assets placed under capital lease)	(667)	(660)
Cost to retire property	(26)	(36)
Other investing activities	(21)	2
Net cash used in investing activities	(714)	(694)
Cash Flows from Financing Activities
Retirement of long-term debt	(37)	(21)
Payment of dividends on common and preferred stock	(255)	(256)
Stockholder contribution	150	315
Increase (decrease) in notes payable	(60)	(170)
Payment of capital lease obligations and other financing costs	(9)	(10)
Net cash provided by (used in) financing activities	(211)	(142)
Net Increase (Decrease) in Cash and Cash Equivalents	326	80
Cash and Cash Equivalents, Beginning of Period	71	18
Cash and Cash Equivalents, End of Period	397	98
Non-Cash Transactions
Capital expenditures not paid	$ 148	$ 170

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Current Assets
Cash and cash equivalents	$ 477	$ 207
Restricted cash and cash equivalents	40	37
Accounts receivable and accrued revenue, less allowances	669	881
Notes receivable	114	98
Notes receivable held for sale		41
Accounts receivable - related parties	12	11
Accrued gas revenue		27
Inventories at average cost
Gas in underground storage	459	681
Materials and supplies	118	117
Generating plant fuel stock	106	120
Deferred income taxes	17
Deferred property taxes	159	216
Regulatory assets	31	89
Prepayments and other current assets	89	72
Total current assets	2,291	2,597
Plant, Property, and Equipment
Plant, property, and equipment, gross	18,217	17,721
Less accumulated depreciation and amortization	5,633	5,415
Plant, property, and equipment, net	12,584	12,306
Construction work in progress	1,191	1,106
Total plant, property, and equipment	13,775	13,412
Other Non-current Assets
Regulatory assets	1,908	1,956
Accounts and notes receivable, less allowances	884	807
Investments	61	61
Other	319	352
Total other non-current assets	3,172	3,176
Total Assets	19,238	19,185
Current Liabilities
Current portion of long-term debt, capital leases, and financing obligation	519	540
Notes payable		60
Accounts payable	558	678
Accounts payable - related parties	6	10
Accrued rate refunds	27	6
Accrued interest	103	108
Accrued taxes	235	316
Deferred income taxes		66
Regulatory liabilities	69	67
Other current liabilities	123	163
Total current liabilities	1,640	2,014
Non-current Liabilities
Long-term debt	8,040	8,016
Non-current portion of capital leases and financing obligation	113	123
Regulatory liabilities	2,136	2,095
Postretirement benefits	846	872
Asset retirement obligations	348	340
Deferred investment tax credit	57	37
Deferred income taxes	1,899	1,682
Other non-current liabilities	304	299
Total non-current liabilities	$ 13,743	$ 13,464
Commitments and Contingencies (Notes 2 and 3)
Equity
Common stock	$ 3	$ 3
Other paid-in capital	4,812	4,774
Accumulated other comprehensive loss	(48)	(49)
Retained earnings (Accumulated deficit)	(949)	(1,058)
Total common stockholders' equity	3,818	3,670
Noncontrolling interests	37	37
Total equity	3,855	3,707
Total Liabilities and Equity	19,238	19,185
Consumers Energy Company [Member]
Current Assets
Cash and cash equivalents	397	71
Restricted cash and cash equivalents	40	37
Accounts receivable and accrued revenue, less allowances	655	863
Accounts receivable - related parties	1	1
Accrued gas revenue		27
Inventories at average cost
Gas in underground storage	459	681
Materials and supplies	113	113
Generating plant fuel stock	100	112
Deferred property taxes	159	216
Regulatory assets	31	89
Prepayments and other current assets	83	63
Total current assets	2,038	2,273
Plant, Property, and Equipment
Plant, property, and equipment, gross	18,074	17,580
Less accumulated depreciation and amortization	5,564	5,346
Plant, property, and equipment, net	12,510	12,234
Construction work in progress	1,184	1,103
Total plant, property, and equipment	13,694	13,337
Other Non-current Assets
Regulatory assets	1,908	1,956
Accounts and notes receivable, less allowances	7	7
Investments	26	38
Other	194	236
Total other non-current assets	2,135	2,237
Total Assets	17,867	17,847
Current Liabilities
Current portion of long-term debt, capital leases, and financing obligation	122	145
Notes payable		60
Accounts payable	540	662
Accounts payable - related parties	11	12
Accrued rate refunds	27	6
Accrued interest	64	70
Accrued taxes	166	149
Deferred income taxes	54	80
Regulatory liabilities	69	67
Other current liabilities	93	135
Total current liabilities	1,146	1,386
Non-current Liabilities
Long-term debt	5,141	5,154
Non-current portion of capital leases and financing obligation	113	123
Regulatory liabilities	2,136	2,095
Postretirement benefits	768	793
Asset retirement obligations	347	339
Deferred investment tax credit	57	37
Deferred income taxes	2,450	2,406
Other non-current liabilities	243	237
Total non-current liabilities	$ 11,255	$ 11,184
Commitments and Contingencies (Notes 2 and 3)
Equity
Common stock	$ 841	$ 841
Other paid-in capital	3,724	3,574
Accumulated other comprehensive loss	(12)	(7)
Retained earnings (Accumulated deficit)	876	832
Total common stockholders' equity	5,429	5,240
Preferred stock	37	37
Total equity	5,466	5,277
Total Liabilities and Equity	$ 17,867	$ 17,847

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Allowances for doubtful accounts receivable	$ 37	$ 40
Allowances for doubtful notes receivable	$ 8	$ 8
Common stock, shares authorized	350,000,000	350,000,000
Common stock, shares outstanding	276,700,000	275,200,000
Consumers Energy Company [Member]
Allowances for doubtful accounts receivable	$ 36	$ 39
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares outstanding	84,100,000	84,100,000

Consolidated Statements Of Chan

Consolidated Statements Of Changes In Equity - USD ($) shares in Millions, $ in Millions	Consumers Energy Company [Member]CMS Energy Common Stock [Member]	Consumers Energy Company [Member]Other Paid-in Capital [Member]	Consumers Energy Company [Member]Accumulated Other Comprehensive Income (Loss) [Member]	Consumers Energy Company [Member]Retirement Benefits Liability [Member]	Consumers Energy Company [Member]Investments [Member]	Consumers Energy Company [Member]Retained Earnings (Accumulated Deficit) [Member]	Consumers Energy Company [Member]Preferred Stock [Member]	Consumers Energy Company [Member]	CMS Energy Common Stock [Member]	Other Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retirement Benefits Liability [Member]	Investments [Member]	Derivative Instruments [Member]	Retained Earnings (Accumulated Deficit) [Member]	Noncontrolling Interest [Member]	Total
Total Equity, beginning at Dec. 31, 2013	$ 841	$ 3,257	$ (2)	$ (17)	$ 15	$ 724	$ 37	$ 4,857	$ 3	$ 4,715	$ (22)	$ (21)		$ (1)	$ (1,242)	$ 37	$ 3,491
Common stock issued										45
Common stock repurchased										(6)
Conversion option on convertible debt										7
Stockholder contribution		315
Amortization of net actuarial loss (gain)				1				1				1					1
Unrealized gain (loss) on investments, net of tax					$ 3			3
Reclassification adjustments included in net income, net of tax
Reclassification adjustments included in net income														$ 1			(1)
Net income attributable to CMS Energy																	287
Net income						330		330							287		288
Dividends declared on common stock						(255)									(144)
Preferred stock dividends and distributions declared						(1)
Income attributable to noncontrolling interests																1	1
Distributions, redemptions, and other changes in noncontrolling interests																(1)
Total Equity, end at Jun. 30, 2014	841	3,572	2	(16)	$ 18	798	37	5,250	3	4,761	(20)	(20)			(1,099)	37	3,682
Total Equity, beginning at Mar. 31, 2014	841	3,407		(17)	17	810	37	5,095	3	4,746	(21)	(21)			(1,110)	37	3,655
Common stock issued										$ 8
Common stock repurchased
Conversion option on convertible debt										$ 7
Stockholder contribution		165
Amortization of net actuarial loss (gain)				1				1				1					1
Unrealized gain (loss) on investments, net of tax					$ 1			1
Reclassification adjustments included in net income, net of tax
Reclassification adjustments included in net income
Net income attributable to CMS Energy																	83
Net income						109		109							83		84
Dividends declared on common stock						(120)									(72)
Preferred stock dividends and distributions declared						(1)
Income attributable to noncontrolling interests																1	1
Distributions, redemptions, and other changes in noncontrolling interests																(1)
Total Equity, end at Jun. 30, 2014	841	3,572	2	(16)	$ 18	798	37	5,250	3	4,761	(20)	(20)			(1,099)	37	3,682
Total Equity, beginning at Dec. 31, 2014	841	3,574	(7)	(26)	19	832	37	$ 5,277	3	4,774	(49)	(48)	$ (1)		(1,058)	37	$ 3,707
Beginning of period, shares at Dec. 31, 2014								84.1									275.2
Common stock issued										39
Common stock repurchased										(11)
Common stock reissued										10
Stockholder contribution		150
Amortization of net actuarial loss (gain)				2				$ 2				2					$ 2
Unrealized gain (loss) on investments, net of tax					(2)			(2)					(1)				(1)
Reclassification adjustments included in net income, net of tax					(5)			5
Reclassification adjustments included in net income
Net income attributable to CMS Energy																	269
Net income						299		$ 299							269		270
Dividends declared on common stock						(254)									(160)
Preferred stock dividends and distributions declared						(1)
Income attributable to noncontrolling interests																1	$ 1
Distributions, redemptions, and other changes in noncontrolling interests																(1)
End of period, shares at Jun. 30, 2015								84.1									276.7
Total Equity, end at Jun. 30, 2015	841	3,724	(12)	(24)	12	876	37	$ 5,466	3	4,812	(48)	(46)	(2)		(949)	37	$ 3,855
Total Equity, beginning at Mar. 31, 2015	841	$ 3,724	(11)	(25)	14	925	37	5,516	3	4,783	(48)	(47)	(1)		(936)	37	3,839
Common stock issued										$ 29
Common stock repurchased
Stockholder contribution
Amortization of net actuarial loss (gain)				1				1				1					1
Unrealized gain (loss) on investments, net of tax					$ (2)			(2)					(1)				(1)
Reclassification adjustments included in net income, net of tax
Reclassification adjustments included in net income
Net income attributable to CMS Energy																	67
Net income						84		$ 84							67		68
Dividends declared on common stock						(132)									(80)
Preferred stock dividends and distributions declared						(1)
Income attributable to noncontrolling interests																1	$ 1
Distributions, redemptions, and other changes in noncontrolling interests																(1)
End of period, shares at Jun. 30, 2015								84.1									276.7
Total Equity, end at Jun. 30, 2015	$ 841	$ 3,724	$ (12)	$ (24)	$ 12	$ 876	$ 37	$ 5,466	$ 3	$ 4,812	$ (48)	$ (46)	$ (2)		$ (949)	$ 37	$ 3,855

New Accounting Standards

New Accounting Standards	6 Months Ended
	Jun. 30, 2015
New Accounting Standards	1: New Accounting Standards New Accounting Standards Not Yet Effective ASU 2014 ‑09, Revenue from Contracts with Customers: This standard was issued by the Financial Accounting Standards Board as a result of a joint project with the International Accounting Standards Board. The Boards developed a common revenue recognition model that will be applied under GAAP and International Financial Reporting Standards. The new guidance will replace most of the existing revenue recognition requirements in GAAP, although certain guidance specific to rate-regulated utilities will be retained. T he standard is expected to become effective January 1, 201 8 for CMS Energy and Consumers . Entities will have the option to apply the standard retrospectively to all prior periods presented, or to apply it retrospectively only to contracts existing at the effective date, with the cumulative effect of the standard recorded as an adjustment to beginning retained earnings. CMS Energy and Consumers are evaluating the impact of the standard on their consolidated financial statements. ASU 2014 ‑12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period: This standard, which will become effective January 1, 2016 for CMS Energy and Consu mers, addresses stock awards with performance targets that can be met after an employee has completed the required service period . The standard was intended to resolve diversity in practice regarding the accounting treatment for this type of award. Under the new guidance, the probability of the performance target being met should be factored into compensation expense each period. This guidance is consistent with the accounting that CMS Energy and Consumers already apply to awards of this type. Therefore, CMS Energy and Consumers do not expect the standard to impact their consolidated financial statements. ASU 2015 ‑02, Amendments to the Consolidation Analysis: This standard, which will become effective January 1, 2016 for CMS Energy and Consumers, provides amended guidance on whether reporting entities should consolidate certain legal entities, including limited partnerships. CMS Energy and Consumers are evaluating the impact of the standard on their consolidated financial statements. ASU 2015 ‑03, Simplifying the Presentation of Debt Issuance Costs: This standard, which will be come effective January 1, 2016 for CMS Energy and Consumers, requires that debt issuance costs be presented as a direct deduction from the carrying amount of long-term debt on the balance sheet. Presently, debt issuance costs are reported as an asset. The new guidance aligns the presentation of debt issuance costs with debt discounts and premiums. The standard is to be applied retrospectively to all prior periods presented. At June 30, 2015 , CMS Energy had $43 million of unamortized debt issuance costs, which included $23 million at Consumers. These amounts are recorded in other non ‑current assets on the consolidated balance sheets.
Consumers Energy Company [Member]
New Accounting Standards	1: New Accounting Standards New Accounting Standards Not Yet Effective ASU 2014 ‑09, Revenue from Contracts with Customers: This standard was issued by the Financial Accounting Standards Board as a result of a joint project with the International Accounting Standards Board. The Boards developed a common revenue recognition model that will be applied under GAAP and International Financial Reporting Standards. The new guidance will replace most of the existing revenue recognition requirements in GAAP, although certain guidance specific to rate-regulated utilities will be retained. T he standard is expected to become effective January 1, 201 8 for CMS Energy and Consumers . Entities will have the option to apply the standard retrospectively to all prior periods presented, or to apply it retrospectively only to contracts existing at the effective date, with the cumulative effect of the standard recorded as an adjustment to beginning retained earnings. CMS Energy and Consumers are evaluating the impact of the standard on their consolidated financial statements. ASU 2014 ‑12, Accounting for Share-Based Payments When the Terms of an Award Provide That a Performance Target Could Be Achieved after the Requisite Service Period: This standard, which will become effective January 1, 2016 for CMS Energy and Consu mers, addresses stock awards with performance targets that can be met after an employee has completed the required service period . The standard was intended to resolve diversity in practice regarding the accounting treatment for this type of award. Under the new guidance, the probability of the performance target being met should be factored into compensation expense each period. This guidance is consistent with the accounting that CMS Energy and Consumers already apply to awards of this type. Therefore, CMS Energy and Consumers do not expect the standard to impact their consolidated financial statements. ASU 2015 ‑02, Amendments to the Consolidation Analysis: This standard, which will become effective January 1, 2016 for CMS Energy and Consumers, provides amended guidance on whether reporting entities should consolidate certain legal entities, including limited partnerships. CMS Energy and Consumers are evaluating the impact of the standard on their consolidated financial statements. ASU 2015 ‑03, Simplifying the Presentation of Debt Issuance Costs: This standard, which will be come effective January 1, 2016 for CMS Energy and Consumers, requires that debt issuance costs be presented as a direct deduction from the carrying amount of long-term debt on the balance sheet. Presently, debt issuance costs are reported as an asset. The new guidance aligns the presentation of debt issuance costs with debt discounts and premiums. The standard is to be applied retrospectively to all prior periods presented. At June 30, 2015 , CMS Energy had $43 million of unamortized debt issuance costs, which included $23 million at Consumers. These amounts are recorded in other non ‑current assets on the consolidated balance sheets.

Regulatory Matters

Regulatory Matters	6 Months Ended
	Jun. 30, 2015
Regulatory Matters	2: REGULATORY MATTERS Regulatory matters are critical to Consumers. The Michigan Attorney General, ABATE, the MPSC Staff, and certain other parties typically participate in MPSC proceedings concerning Consumers, such as Consumers’ rate cases and PSCR and GCR processes. These parties often challenge various aspects of those proceedings, including the prudence of Consumers’ policies and practices, and seek cost disallowances and other relief. The parties also have appealed significant MPSC orders. Depending upon the specific issues, the outcomes of rate cases and proceedings, including judicial proceedings challenging MPSC orders or other actions, could negatively affect CMS Energy’s and Consumers’ liquidity, financial condition, and results of operations. Consumers cannot predict the outcome of these proceedings. There are multiple appeals pending that involve various issues concerning cost allocation among customers, the allocation of refunds among customer groups, the adequacy of the record evidence supporting the recovery of Smart Energy investments, and other matters. Consumers is unable to predict the outcome of these appeals. Electric Rate Case: In December 2014, Consumers filed an application with the MPSC seeking an annual rate increase of $163 million, based on a 10.7 percent authorized return on equity. The filing requested authority to recover new investment in system reliability, environmental compliance, and technology enhancements. Presented in the following table are the components of the requested increase in revenue: In Millions Components of the rate increase Investment in rate base $ Addition of natural gas-fueled electric generating plant Operating and maintenance costs Cost of capital Working capital Cost-reduction initiatives Gross margin Total $ The filing also seeks approval of an investment recovery mechanism that would allow recovery of an additional $163 million in total for incremental investments that Consumers plans to make in 2016 and 2017 and $78 million for incremental investments planned in 2018, subject to reconciliation . In June 2015, Consumers self-implemented an annual rate increase of $110 million, subject to refund with interest. Gas Rate Case: In July 2014, Consumers filed an application with the MPSC seeking an annual rate increase of $88 million. The filing requested authority to recover new investments that will allow Consumers to improve system reliability, comply with regulations, and enhance technology. In January 2015, the MPSC approved a settlement agreement authorizing a $45 million annual rate increase, based on a 10.3 percent authorized return on equity. This was Consumers’ first gas base rate increase since 2012. Energy Optimization Plan Incentive: Consumers exceeded its savings targets under both electric and gas optimization plans during 2014, and therefore requested the MPSC’s approval to collect $17 million, the maximum incentive, in its energy optimization reconciliation filed in May 2015 .
Consumers Energy Company [Member]
Regulatory Matters	2: REGULATORY MATTERS Regulatory matters are critical to Consumers. The Michigan Attorney General, ABATE, the MPSC Staff, and certain other parties typically participate in MPSC proceedings concerning Consumers, such as Consumers’ rate cases and PSCR and GCR processes. These parties often challenge various aspects of those proceedings, including the prudence of Consumers’ policies and practices, and seek cost disallowances and other relief. The parties also have appealed significant MPSC orders. Depending upon the specific issues, the outcomes of rate cases and proceedings, including judicial proceedings challenging MPSC orders or other actions, could negatively affect CMS Energy’s and Consumers’ liquidity, financial condition, and results of operations. Consumers cannot predict the outcome of these proceedings. There are multiple appeals pending that involve various issues concerning cost allocation among customers, the allocation of refunds among customer groups, the adequacy of the record evidence supporting the recovery of Smart Energy investments, and other matters. Consumers is unable to predict the outcome of these appeals. Electric Rate Case: In December 2014, Consumers filed an application with the MPSC seeking an annual rate increase of $163 million, based on a 10.7 percent authorized return on equity. The filing requested authority to recover new investment in system reliability, environmental compliance, and technology enhancements. Presented in the following table are the components of the requested increase in revenue: In Millions Components of the rate increase Investment in rate base $ Addition of natural gas-fueled electric generating plant Operating and maintenance costs Cost of capital Working capital Cost-reduction initiatives Gross margin Total $ The filing also seeks approval of an investment recovery mechanism that would allow recovery of an additional $163 million in total for incremental investments that Consumers plans to make in 2016 and 2017 and $78 million for incremental investments planned in 2018, subject to reconciliation . In June 2015, Consumers self-implemented an annual rate increase of $110 million, subject to refund with interest. Gas Rate Case: In July 2014, Consumers filed an application with the MPSC seeking an annual rate increase of $88 million. The filing requested authority to recover new investments that will allow Consumers to improve system reliability, comply with regulations, and enhance technology. In January 2015, the MPSC approved a settlement agreement authorizing a $45 million annual rate increase, based on a 10.3 percent authorized return on equity. This was Consumers’ first gas base rate increase since 2012. Energy Optimization Plan Incentive: Consumers exceeded its savings targets under both electric and gas optimization plans during 2014, and therefore requested the MPSC’s approval to collect $17 million, the maximum incentive, in its energy optimization reconciliation filed in May 2015 .

Contingencies And Commitments

Contingencies And Commitments	6 Months Ended
	Jun. 30, 2015
Contingencies And Commitments	3: CONTINGENCIES AND COMMITMENTS CMS Energy and Consumers are involved in various matters that give rise to contingent liabilities. Depending on the specific issues, the resolution of these contingencies could negatively affect CMS Energy’s and Consumers’ liquidity, financial condition, and results of operations. In their disclosures of these matters, CMS Energy and Consumers provide an estimate of the possible loss or range of loss when such an estimate can be made. Disclosures that state that CMS Energy or Consumers cannot predict the outcome of a matter indicate that they are unable to estimate a possible loss or range of loss for the matter. CMS Energy Contingencies Gas Index Price Reporting Litigation: CMS Energy, along with CMS MST, CMS Field Services, Cantera Natural Gas, Inc., and Cantera Gas Company, have been named as defendants in five class action lawsuits arising as a result of alleged inaccurate natural gas price reporting to publications that report trade information. Allegations include manipulation of NYMEX natural gas futures and options prices, price-fixing conspiracies, restraint of trade, and artificial inflation of natural gas retail prices in Kansas, Missouri, and Wisconsin. Plaintiffs are making claims for the following: full consideration damages, treble damages, exemplary damages, costs, interest, and/or attorney fees. After removal to federal court, all of the cases were transferred to a single federal district court pursuant to the multidistrict litigation process. In 2010 and 2011, all claims against CMS Energy defendants were dismissed by the district court based on FERC preemption. Plaintiffs filed appeals in all of the cases. The issues on appeal were whether the district court erred in dismissing the cases based on FERC preemption and denying the plaintiffs’ motions for leave to amend their complaints to add a federal Sherman Act antitrust claim. The plaintiffs did not appeal the dismissal of CMS Energy as a defendant in these cases, but other CMS Energy entities remain as defendants. In 2013, the U.S. Court of Appeals for the Ninth Circuit reversed the district court decision and remanded the case to the district court judge for further proceedings. The appellate court found that FERC preemption does not apply under the facts of these cases. The appellate court affirmed the district court’s denial of leave to amend to add federal antitrust claims. The matter was appealed to the U.S. Supreme Court , which in April 2015 upheld the Ninth Circuit’s decision. The cases have been remanded back to the federal district court. These cases involve complex facts, a large number of similarly situated defendants with different factual positions, and multiple jurisdictions. Presently, any estimate of liability would be highly speculative; the amount of CMS Energy’s possible loss would be based on widely varying models previously untested in this context. If the outcome after appeals is unfavorable, these cases could negatively affect CMS Energy’s liquidity, financial condition, and results of operations. Bay Harbor: CMS Land retained environmental remediation obligations for the collection and treatment of leachate, a liquid consisting of water and other substances, at Bay Harbor after selling its interests in the development in 2002. Leachate is produced when water enters into cement kiln dust piles left over from former cement plant operations at the site. In 2012, CMS Land and the MDEQ finalized an agreement that established the final remedies and the future water quality criteria at the site. CMS Land has completed all construction necessary to implement the remedies required by the agreement and will continue to maintain and operate a system to discharge treated leachate into Little Traverse Bay under an NPDES permit issued in 2010. CMS Land is presently working with the MDEQ to renew this permit, which requires renewal every five years. Various claims have been brought against CMS Land or its affiliates, including CMS Energy, alleging environmental damage to property, loss of property value, insufficient disclosure of environmental matters, breach of agreement relating to access, or other matters. CMS Land and other parties have received a demand for payment from the EPA in the amount of $ 8 million, plus interest. The EPA is seeking recovery under CERCLA of response costs allegedly incurred at Bay Harbor. These costs exceed what was agreed to in a 2005 order between CMS Land and the EPA, and CMS Land has communicated to the EPA that it does not believe that this is a valid claim. In August 2014, the EPA indicated that it intends to pursue the claim. CMS Energy has recorded a cumulative charge related to Bay Harbor of $ 246 million, which includes accretion expense. At June 30, 2015 , CMS Energy had a recorded liability of $60 million for its remaining obligations. CMS Energy calculated this liability based on discounted projected costs, using a discount rate of 4.34 percent and an inflation rate of one percent on annual operating and maintenance costs. The undiscounted amount of the remaining obligation is $77 million. CMS Energy expects to pay the following amounts for long-term liquid disposal and operating and maintenance costs in 2015 and in each of the next four years: In Millions CMS Energy Long-term liquid disposal and operating and maintenance costs $ $ $ $ $ CMS Energy’s estimate of response activity costs and the timing of expenditures could change if there are changes in circumstances or assumptions used in calculating the liability. Although a liability for its present estimate of remaining response activity costs has been recorded, CMS Energy cannot predict the ultimate financial impact or outcome of this matter. Equatorial Guinea Tax Claim: In 2002, CMS Energy sold its oil, gas, and methanol investments in Equatorial Guinea. The government of Equatorial Guinea claims that CMS Energy owes $ 142 million in taxes, plus significant penalties and interest, in connection with the sale and may proceed to formal arbitration. CMS Energy has concluded that the government’s tax claim is without merit. CMS Energy is vigorously contesting the claim but cannot predict the financial impact or outcome of this matter. It is possible that the outcome of this matter could negatively affect CMS Energy’s liquidity, financial condition, and results of operations. Consumers Electric Utility Contingencies Electric Environmental Matters: Consumers’ operations are subject to environmental laws and regulations. Historically, Consumers has generally been able to recover, in customer rates, the costs to operate its facilities in compliance with these laws and regulations. Cleanup and Solid Waste: Consumers expects to incur remediation and other response activity costs at a number of sites under NREPA. Consumers believes that these costs should be recoverable in rates, but cannot guarantee that outcome. Consumers estimates that its liability for NREPA sites for which it can estimate a range of loss will be between $ 5 million and $ 7 million. At June 30, 2015 , Consumers had a recorded liability of $ 5 million, the minimum amount in the range of its estimated probable NREPA liability. Consumers is a potentially responsible party at a number of contaminated sites administered under CERCLA. CERCLA liability is joint and several. In 2010, Consumers received official notification from the EPA that identified Consumers as a potentially responsible party for cleanup of PCBs at the Kalamazoo River CERCLA site. The notification claimed that the EPA has reason to believe that Consumers disposed of PCBs and arranged for the disposal and treatment of PCB-containing materials at portions of the site. In 2011, Consumers received a follow ‑up letter from the EPA requesting that Consumers agree to participate in a removal action plan along with several other companies for an area of lower Portage Creek, which is connected to the Kalamazoo River. All parties, including Consumers, that were asked to participate in the removal action plan declined to accept liability. Until further information is received from the EPA, Consumers is unable to estimate a range of potential liability for cleanup of the river. Based on its experience, Consumers estimates that its share of the total liability for known CERCLA sites will be between $ 3 million and $ 9 million. Various factors, including the number of potentially responsible parties involved with each site, affect Consumers’ share of the total liability. At June 30, 2015 , Consumers had a recorded liability of $ 3 million for its share of the total liability at these sites, the minimum amount in the range of its estimated probable CERCLA liability. The timing of payments related to Consumers’ remediation and other response activities at its CERCLA and NREPA sites is uncertain. Consumers periodically reviews these cost estimates. Any significant change in the underlying assumptions, such as an increase in the number of sites, different remediation techniques, the nature and extent of contamination, and legal and regulatory requirements, could affect its estimates of NREPA and CERCLA liability. Ludington PCB: In 1998, during routine maintenance activities, Consumers identified PCB as a component in certain paint, grout, and sealant materials at Ludington. Consumers removed part of the PCB material and replaced it with non ‑PCB material. Consumers has had several communications with the EPA regarding this matter. Consumers cannot predict the financial impact or outcome of this matter. CCRs: In April 2015, the EPA published a final rule regulating CCRs, such as coal ash, under the Resource Conservation and Recovery Act. The final rule adopts non ‑ hazardous minimum standards for beneficially reusing and disposing of CCRs. The rule establishes new minimum requirements for site location, groundwater monitoring, flood protection, storm water design, fugitive dust control, and public disclosure of information. The rule also sets out conditions under which CCR units would be forced to cease receiving CCR and non ‑CCR waste and initiate closure based on the inability to achieve minimum safety standards, meet a location standard, or meet minimum groundwater standards. Consumers will accelerate a minor amount of its planned capital and cost of removal expenditures at its coal-fueled units to meet compliance deadlines, but does not expect any adverse changes to its environmental strategy, liquidity, financial condition, or results of operations as a result of the final rule. Consumers Gas Utility Contingencies Gas Environmental Matters: Consumers expects to incur remediation and other response activity costs at a number of sites under the NREPA. These sites include 23 former MGP facilities. Consumers operated the facilities on these sites for some part of their operating lives. For some of these sites, Consumers has no present ownership interest or may own only a portion of the original site. At June 30, 2015 , Consumers had a recorded liability of $ 113 million for its remaining obligations for these sites. This amount represents the present value of long-term projected costs, using a discount rate of 2.57 percent and an inflation rate of 2.5 percent. The undiscounted amount of the remaining obligation is $ 128 million. Consumers expects to pay the following amounts for remediation and other response activity costs in 2015 and in each of the next four years: In Millions Consumers Remediation and other response activity costs $ $ $ $ $ Consumers periodically reviews these cost estimates. Any significant change in the underlying assumptions, such as an increase in the number of sites, changes in remediation techniques, or legal and regulatory requirements, could affect Consumers’ estimates of annual response activity costs and the MGP liability. Pursuant to orders issued by the MPSC, Consumers defers its MGP-related remediation costs and recovers them from its customers over a ten -year period. At June 30, 2015 , Consumers had a regulatory asset of $ 144 million related to the MGP sites. Consumers estimates that its liability to perform remediation and other response activities at NREPA sites other than the MGP sites could reach $3 million. At June 30, 2015 , Consumers had a recorded liability of less than $1 million, the minimum amount in the range of its estimated probable liability. Guarantees Presented in the following table are CMS Energy’s and Consumers’ guarantees at June 30, 2015 : In Millions Maximum Carrying Guarantee Description Issue Date Expiration Date Obligation Amount CMS Energy, including Consumers Indemnity obligations from asset sales and other agreements Various Various through August 2029 $ 1 $ Guarantees Various Various through March 2021 - Consumers Indemnity obligations and other guarantees Various Various through August 2029 $ $ 1 The majority of this amount arises from stock and asset sale agreements under which CMS Energy or a subsidiary of CMS Energy, other than Consumers, indemnified the purchaser for losses resulting from various matters, including claims related to tax disputes, claims related to power purchase agreements, and defects in title to the assets or stock sold to the purchaser by CMS Energy subsidiaries. Except for items described elsewhere in this Note, CMS Energy believes the likelihood of material loss to be remote for the indemnity obligations not recorded as liabilities. Presented in the following table is additional information regarding CMS Energy’s and Consumers’ guarantees: Guarantee Description How Guarantee Arose Events That Would Require Performance CMS Energy, including Consumers Indemnity obligations from asset sales and other agreements Stock and asset sale agreements Findings of misrepresentation, breach of warranties, tax claims, and other specific events or circumstances Guarantees Normal operating activity Nonperformance or non-payment by a subsidiary under a related contract Consumers Indemnity obligations and other guarantees Normal operating activity Nonperformance or claims made by a third party under a related contract CMS Energy, Consumers, and certain other subsidiaries of CMS Energy also enter into various agreements containing tax and other indemnity provisions for which they are unable to estimate the maximum potential obligation. These factors include unspecified exposure under certain agreements. CMS Energy and Consumers consider the likelihood that they would be required to perform or incur substantial losses related to these indemnities to be remote. Other Contingencies Michigan Sales and Use Tax Litigation: In 2010, the Michigan Department of Treasury finalized a sales and use tax audit of Consumers for the period from October 1, 1997 to December 31, 2004. It determined that Consumers’ electric and natural gas distribution equipment was not eligible for an industrial-processing exemption and therefore was subject to the use tax. Consumers paid the tax for the period from 1997 through 2004 and filed a claim in the Michigan Court of Claims disputing the tax determination. Consumers has continued to apply the industrial-processing exemption for the years subsequent to 2004. Detroit Edison Company was also denied the tax exemption and filed a similar claim in the Michigan Court of Claims, which was subsequently appealed to the Michigan Supreme Court. In July 2015, the Michigan Supreme Court issued an opinion finding that Detroit Edison Company was eligible for a partial industrial-processing exemption on its electric distribution equipment. It remanded the case back to the Michigan Court of Claims. The results of this case could affect Consumers’ claim, which could result in a partial refund of taxes paid previously or an assessment of additional taxes and interest owed for the years subsequent to 2004. Consumers cannot estimate the amount or timing of any potential tax refunds or assessments, but considers the likelihood of a material unfavorable outcome to be remote. Other: In addition to the matters disclosed in this Note and Note 2, Regulatory Matters, there are certain other lawsuits and administrative proceedings before various courts and governmental agencies arising in the ordinary course of business to which CMS Energy, Consumers, and certain other subsidiaries of CMS Energy are parties. These other lawsuits and proceedings may involve personal injury, property damage, contracts, environmental matters, federal and state taxes, rates, licensing, employment, and other matters. Further, CMS Energy and Consumers occasionally self-report certain regulatory non ‑compliance matters that may or may not eventually result in administrative proceedings. CMS Energy and Consumers believe that the outcome of any one of these proceedings will not have a material negative effect on their consolidated results of operations, financial condition, or liquidity.
Consumers Energy Company [Member]
Contingencies And Commitments	3: CONTINGENCIES AND COMMITMENTS CMS Energy and Consumers are involved in various matters that give rise to contingent liabilities. Depending on the specific issues, the resolution of these contingencies could negatively affect CMS Energy’s and Consumers’ liquidity, financial condition, and results of operations. In their disclosures of these matters, CMS Energy and Consumers provide an estimate of the possible loss or range of loss when such an estimate can be made. Disclosures that state that CMS Energy or Consumers cannot predict the outcome of a matter indicate that they are unable to estimate a possible loss or range of loss for the matter. CMS Energy Contingencies Gas Index Price Reporting Litigation: CMS Energy, along with CMS MST, CMS Field Services, Cantera Natural Gas, Inc., and Cantera Gas Company, have been named as defendants in five class action lawsuits arising as a result of alleged inaccurate natural gas price reporting to publications that report trade information. Allegations include manipulation of NYMEX natural gas futures and options prices, price-fixing conspiracies, restraint of trade, and artificial inflation of natural gas retail prices in Kansas, Missouri, and Wisconsin. Plaintiffs are making claims for the following: full consideration damages, treble damages, exemplary damages, costs, interest, and/or attorney fees. After removal to federal court, all of the cases were transferred to a single federal district court pursuant to the multidistrict litigation process. In 2010 and 2011, all claims against CMS Energy defendants were dismissed by the district court based on FERC preemption. Plaintiffs filed appeals in all of the cases. The issues on appeal were whether the district court erred in dismissing the cases based on FERC preemption and denying the plaintiffs’ motions for leave to amend their complaints to add a federal Sherman Act antitrust claim. The plaintiffs did not appeal the dismissal of CMS Energy as a defendant in these cases, but other CMS Energy entities remain as defendants. In 2013, the U.S. Court of Appeals for the Ninth Circuit reversed the district court decision and remanded the case to the district court judge for further proceedings. The appellate court found that FERC preemption does not apply under the facts of these cases. The appellate court affirmed the district court’s denial of leave to amend to add federal antitrust claims. The matter was appealed to the U.S. Supreme Court , which in April 2015 upheld the Ninth Circuit’s decision. The cases have been remanded back to the federal district court. These cases involve complex facts, a large number of similarly situated defendants with different factual positions, and multiple jurisdictions. Presently, any estimate of liability would be highly speculative; the amount of CMS Energy’s possible loss would be based on widely varying models previously untested in this context. If the outcome after appeals is unfavorable, these cases could negatively affect CMS Energy’s liquidity, financial condition, and results of operations. Bay Harbor: CMS Land retained environmental remediation obligations for the collection and treatment of leachate, a liquid consisting of water and other substances, at Bay Harbor after selling its interests in the development in 2002. Leachate is produced when water enters into cement kiln dust piles left over from former cement plant operations at the site. In 2012, CMS Land and the MDEQ finalized an agreement that established the final remedies and the future water quality criteria at the site. CMS Land has completed all construction necessary to implement the remedies required by the agreement and will continue to maintain and operate a system to discharge treated leachate into Little Traverse Bay under an NPDES permit issued in 2010. CMS Land is presently working with the MDEQ to renew this permit, which requires renewal every five years. Various claims have been brought against CMS Land or its affiliates, including CMS Energy, alleging environmental damage to property, loss of property value, insufficient disclosure of environmental matters, breach of agreement relating to access, or other matters. CMS Land and other parties have received a demand for payment from the EPA in the amount of $ 8 million, plus interest. The EPA is seeking recovery under CERCLA of response costs allegedly incurred at Bay Harbor. These costs exceed what was agreed to in a 2005 order between CMS Land and the EPA, and CMS Land has communicated to the EPA that it does not believe that this is a valid claim. In August 2014, the EPA indicated that it intends to pursue the claim. CMS Energy has recorded a cumulative charge related to Bay Harbor of $ 246 million, which includes accretion expense. At June 30, 2015 , CMS Energy had a recorded liability of $60 million for its remaining obligations. CMS Energy calculated this liability based on discounted projected costs, using a discount rate of 4.34 percent and an inflation rate of one percent on annual operating and maintenance costs. The undiscounted amount of the remaining obligation is $77 million. CMS Energy expects to pay the following amounts for long-term liquid disposal and operating and maintenance costs in 2015 and in each of the next four years: In Millions CMS Energy Long-term liquid disposal and operating and maintenance costs $ $ $ $ $ CMS Energy’s estimate of response activity costs and the timing of expenditures could change if there are changes in circumstances or assumptions used in calculating the liability. Although a liability for its present estimate of remaining response activity costs has been recorded, CMS Energy cannot predict the ultimate financial impact or outcome of this matter. Equatorial Guinea Tax Claim: In 2002, CMS Energy sold its oil, gas, and methanol investments in Equatorial Guinea. The government of Equatorial Guinea claims that CMS Energy owes $ 142 million in taxes, plus significant penalties and interest, in connection with the sale and may proceed to formal arbitration. CMS Energy has concluded that the government’s tax claim is without merit. CMS Energy is vigorously contesting the claim but cannot predict the financial impact or outcome of this matter. It is possible that the outcome of this matter could negatively affect CMS Energy’s liquidity, financial condition, and results of operations. Consumers Electric Utility Contingencies Electric Environmental Matters: Consumers’ operations are subject to environmental laws and regulations. Historically, Consumers has generally been able to recover, in customer rates, the costs to operate its facilities in compliance with these laws and regulations. Cleanup and Solid Waste: Consumers expects to incur remediation and other response activity costs at a number of sites under NREPA. Consumers believes that these costs should be recoverable in rates, but cannot guarantee that outcome. Consumers estimates that its liability for NREPA sites for which it can estimate a range of loss will be between $ 5 million and $ 7 million. At June 30, 2015 , Consumers had a recorded liability of $ 5 million, the minimum amount in the range of its estimated probable NREPA liability. Consumers is a potentially responsible party at a number of contaminated sites administered under CERCLA. CERCLA liability is joint and several. In 2010, Consumers received official notification from the EPA that identified Consumers as a potentially responsible party for cleanup of PCBs at the Kalamazoo River CERCLA site. The notification claimed that the EPA has reason to believe that Consumers disposed of PCBs and arranged for the disposal and treatment of PCB-containing materials at portions of the site. In 2011, Consumers received a follow ‑up letter from the EPA requesting that Consumers agree to participate in a removal action plan along with several other companies for an area of lower Portage Creek, which is connected to the Kalamazoo River. All parties, including Consumers, that were asked to participate in the removal action plan declined to accept liability. Until further information is received from the EPA, Consumers is unable to estimate a range of potential liability for cleanup of the river. Based on its experience, Consumers estimates that its share of the total liability for known CERCLA sites will be between $ 3 million and $ 9 million. Various factors, including the number of potentially responsible parties involved with each site, affect Consumers’ share of the total liability. At June 30, 2015 , Consumers had a recorded liability of $ 3 million for its share of the total liability at these sites, the minimum amount in the range of its estimated probable CERCLA liability. The timing of payments related to Consumers’ remediation and other response activities at its CERCLA and NREPA sites is uncertain. Consumers periodically reviews these cost estimates. Any significant change in the underlying assumptions, such as an increase in the number of sites, different remediation techniques, the nature and extent of contamination, and legal and regulatory requirements, could affect its estimates of NREPA and CERCLA liability. Ludington PCB: In 1998, during routine maintenance activities, Consumers identified PCB as a component in certain paint, grout, and sealant materials at Ludington. Consumers removed part of the PCB material and replaced it with non ‑PCB material. Consumers has had several communications with the EPA regarding this matter. Consumers cannot predict the financial impact or outcome of this matter. CCRs: In April 2015, the EPA published a final rule regulating CCRs, such as coal ash, under the Resource Conservation and Recovery Act. The final rule adopts non ‑ hazardous minimum standards for beneficially reusing and disposing of CCRs. The rule establishes new minimum requirements for site location, groundwater monitoring, flood protection, storm water design, fugitive dust control, and public disclosure of information. The rule also sets out conditions under which CCR units would be forced to cease receiving CCR and non ‑CCR waste and initiate closure based on the inability to achieve minimum safety standards, meet a location standard, or meet minimum groundwater standards. Consumers will accelerate a minor amount of its planned capital and cost of removal expenditures at its coal-fueled units to meet compliance deadlines, but does not expect any adverse changes to its environmental strategy, liquidity, financial condition, or results of operations as a result of the final rule. Consumers Gas Utility Contingencies Gas Environmental Matters: Consumers expects to incur remediation and other response activity costs at a number of sites under the NREPA. These sites include 23 former MGP facilities. Consumers operated the facilities on these sites for some part of their operating lives. For some of these sites, Consumers has no present ownership interest or may own only a portion of the original site. At June 30, 2015 , Consumers had a recorded liability of $ 113 million for its remaining obligations for these sites. This amount represents the present value of long-term projected costs, using a discount rate of 2.57 percent and an inflation rate of 2.5 percent. The undiscounted amount of the remaining obligation is $ 128 million. Consumers expects to pay the following amounts for remediation and other response activity costs in 2015 and in each of the next four years: In Millions Consumers Remediation and other response activity costs $ $ $ $ $ Consumers periodically reviews these cost estimates. Any significant change in the underlying assumptions, such as an increase in the number of sites, changes in remediation techniques, or legal and regulatory requirements, could affect Consumers’ estimates of annual response activity costs and the MGP liability. Pursuant to orders issued by the MPSC, Consumers defers its MGP-related remediation costs and recovers them from its customers over a ten -year period. At June 30, 2015 , Consumers had a regulatory asset of $ 144 million related to the MGP sites. Consumers estimates that its liability to perform remediation and other response activities at NREPA sites other than the MGP sites could reach $3 million. At June 30, 2015 , Consumers had a recorded liability of less than $1 million, the minimum amount in the range of its estimated probable liability. Guarantees Presented in the following table are CMS Energy’s and Consumers’ guarantees at June 30, 2015 : In Millions Maximum Carrying Guarantee Description Issue Date Expiration Date Obligation Amount CMS Energy, including Consumers Indemnity obligations from asset sales and other agreements Various Various through August 2029 $ 1 $ Guarantees Various Various through March 2021 - Consumers Indemnity obligations and other guarantees Various Various through August 2029 $ $ 1 The majority of this amount arises from stock and asset sale agreements under which CMS Energy or a subsidiary of CMS Energy, other than Consumers, indemnified the purchaser for losses resulting from various matters, including claims related to tax disputes, claims related to power purchase agreements, and defects in title to the assets or stock sold to the purchaser by CMS Energy subsidiaries. Except for items described elsewhere in this Note, CMS Energy believes the likelihood of material loss to be remote for the indemnity obligations not recorded as liabilities. Presented in the following table is additional information regarding CMS Energy’s and Consumers’ guarantees: Guarantee Description How Guarantee Arose Events That Would Require Performance CMS Energy, including Consumers Indemnity obligations from asset sales and other agreements Stock and asset sale agreements Findings of misrepresentation, breach of warranties, tax claims, and other specific events or circumstances Guarantees Normal operating activity Nonperformance or non-payment by a subsidiary under a related contract Consumers Indemnity obligations and other guarantees Normal operating activity Nonperformance or claims made by a third party under a related contract CMS Energy, Consumers, and certain other subsidiaries of CMS Energy also enter into various agreements containing tax and other indemnity provisions for which they are unable to estimate the maximum potential obligation. These factors include unspecified exposure under certain agreements. CMS Energy and Consumers consider the likelihood that they would be required to perform or incur substantial losses related to these indemnities to be remote. Other Contingencies Michigan Sales and Use Tax Litigation: In 2010, the Michigan Department of Treasury finalized a sales and use tax audit of Consumers for the period from October 1, 1997 to December 31, 2004. It determined that Consumers’ electric and natural gas distribution equipment was not eligible for an industrial-processing exemption and therefore was subject to the use tax. Consumers paid the tax for the period from 1997 through 2004 and filed a claim in the Michigan Court of Claims disputing the tax determination. Consumers has continued to apply the industrial-processing exemption for the years subsequent to 2004. Detroit Edison Company was also denied the tax exemption and filed a similar claim in the Michigan Court of Claims, which was subsequently appealed to the Michigan Supreme Court. In July 2015, the Michigan Supreme Court issued an opinion finding that Detroit Edison Company was eligible for a partial industrial-processing exemption on its electric distribution equipment. It remanded the case back to the Michigan Court of Claims. The results of this case could affect Consumers’ claim, which could result in a partial refund of taxes paid previously or an assessment of additional taxes and interest owed for the years subsequent to 2004. Consumers cannot estimate the amount or timing of any potential tax refunds or assessments, but considers the likelihood of a material unfavorable outcome to be remote. Other: In addition to the matters disclosed in this Note and Note 2, Regulatory Matters, there are certain other lawsuits and administrative proceedings before various courts and governmental agencies arising in the ordinary course of business to which CMS Energy, Consumers, and certain other subsidiaries of CMS Energy are parties. These other lawsuits and proceedings may involve personal injury, property damage, contracts, environmental matters, federal and state taxes, rates, licensing, employment, and other matters. Further, CMS Energy and Consumers occasionally self-report certain regulatory non ‑compliance matters that may or may not eventually result in administrative proceedings. CMS Energy and Consumers believe that the outcome of any one of these proceedings will not have a material negative effect on their consolidated results of operations, financial condition, or liquidity.

Financings And Capitalization

Financings And Capitalization	6 Months Ended
	Jun. 30, 2015
Financings And Capitalization	4: FINANCINGS AND CAPITALIZATION Revolving Credit Facilities: The following secured revolving credit facilities with banks were available at June 30, 2015 : In Millions Letters of Credit Expiration Date Amount of Facility Amount Borrowed Outstanding Amount Available CMS Energy parent May 27, 2020 1 $ $ - $ $ Consumers May 27, 2020 2 $ $ - $ $ May 9, 2018 2 - - 1 During the six months ended June 30, 2015 , CMS Energy’s average borrowings totaled $61 million with a weighted-average interest rate of 1.43 percent. Obligations under this facility are secured by Consumers common stock. 2 Obligations under this facility are secured by FMBs of Consumers. Short-term Borrowings: Under Consumers’ revolving accounts receivable sales program, which will expire in November 2016 and is generally renewed annually, Consumers may transfer up to $ 250 million of accounts receivable, subject to certain eligibility requirements. These transactions are accounted for as short-term secured borrowings. At June 30, 2015 , no accounts receivable had been transferred under the program. In September 2014, Consumers entered into a commercial paper program. Under the program, Consumers may issue, in one or more placements, commercial paper notes with maturities of up to 365 days and that bear interest at fixed or floating rates. These issuances are supported by Consumers’ $650 million revolving credit facility and may have an aggregate principal amount outstanding of up to $500 million. While the amount of outstanding commercial paper does not reduce the revolver’s available capacity, Consumers would not issue commercial paper in an amount exceeding the available revolver capacity. At June 30, 2015 , no commercial paper notes were outstanding under this program. Dividend Restrictions: At June 30, 2015 , payment of dividends by CMS Energy on its common stock was limited to $ 3.8 billion under provisions of the Michigan Business Corporation Act of 1972. Under the provisions of its articles of incorporation, at June 30, 2015 , Consumers had $ 811 million of unrestricted retained earnings available to pay dividends on its common stock to CMS Energy. Provisions of the Federal Power Act and the Natural Gas Act appear to restrict dividends payable by Consumers to the amount of Consumers’ retained earnings. Several decisions from FERC suggest that under a variety of circumstances dividends from Consumers on its common stock would not be limited to amounts in Consumers’ retained earnings. Any decision by Consumers to pay dividends on its common stock in excess of retained earnings would be based on specific facts and circumstances and would be subject to a formal regulatory filing process. For the six months ended June 30, 2015 , Consumers paid $ 254 million in dividends on its common stock to CMS Energy. Issuance of Common Stock: In April 2015, CMS Energy renewed its continuous equity offering program. Under this program, CMS Energy may sell, from time to time in “at the market” offerings, common stock having an aggregate sales price of up to $100 million. Presented in the following table are the transactions that CMS Energy entered into under the program: Number of Average Proceeds Shares Issued Price per Share (In Millions) April – May 2015 $ $ July 2-7, 2015 Total $ $ With these transactions, CMS Energy has completed its planned stock issuances under the program for 2015.
Consumers Energy Company [Member]
Financings And Capitalization	4: FINANCINGS AND CAPITALIZATION Revolving Credit Facilities: The following secured revolving credit facilities with banks were available at June 30, 2015 : In Millions Letters of Credit Expiration Date Amount of Facility Amount Borrowed Outstanding Amount Available CMS Energy parent May 27, 2020 1 $ $ - $ $ Consumers May 27, 2020 2 $ $ - $ $ May 9, 2018 2 - - 1 During the six months ended June 30, 2015 , CMS Energy’s average borrowings totaled $61 million with a weighted-average interest rate of 1.43 percent. Obligations under this facility are secured by Consumers common stock. 2 Obligations under this facility are secured by FMBs of Consumers. Short-term Borrowings: Under Consumers’ revolving accounts receivable sales program, which will expire in November 2016 and is generally renewed annually, Consumers may transfer up to $ 250 million of accounts receivable, subject to certain eligibility requirements. These transactions are accounted for as short-term secured borrowings. At June 30, 2015 , no accounts receivable had been transferred under the program. In September 2014, Consumers entered into a commercial paper program. Under the program, Consumers may issue, in one or more placements, commercial paper notes with maturities of up to 365 days and that bear interest at fixed or floating rates. These issuances are supported by Consumers’ $650 million revolving credit facility and may have an aggregate principal amount outstanding of up to $500 million. While the amount of outstanding commercial paper does not reduce the revolver’s available capacity, Consumers would not issue commercial paper in an amount exceeding the available revolver capacity. At June 30, 2015 , no commercial paper notes were outstanding under this program. Dividend Restrictions: At June 30, 2015 , payment of dividends by CMS Energy on its common stock was limited to $ 3.8 billion under provisions of the Michigan Business Corporation Act of 1972. Under the provisions of its articles of incorporation, at June 30, 2015 , Consumers had $ 811 million of unrestricted retained earnings available to pay dividends on its common stock to CMS Energy. Provisions of the Federal Power Act and the Natural Gas Act appear to restrict dividends payable by Consumers to the amount of Consumers’ retained earnings. Several decisions from FERC suggest that under a variety of circumstances dividends from Consumers on its common stock would not be limited to amounts in Consumers’ retained earnings. Any decision by Consumers to pay dividends on its common stock in excess of retained earnings would be based on specific facts and circumstances and would be subject to a formal regulatory filing process. For the six months ended June 30, 2015 , Consumers paid $ 254 million in dividends on its common stock to CMS Energy. Issuance of Common Stock: In April 2015, CMS Energy renewed its continuous equity offering program. Under this program, CMS Energy may sell, from time to time in “at the market” offerings, common stock having an aggregate sales price of up to $100 million. Presented in the following table are the transactions that CMS Energy entered into under the program: Number of Average Proceeds Shares Issued Price per Share (In Millions) April – May 2015 $ $ July 2-7, 2015 Total $ $ With these transactions, CMS Energy has completed its planned stock issuances under the program for 2015.

Fair Value Measurements

Fair Value Measurements	6 Months Ended
	Jun. 30, 2015
Fair Value Measurements	5: FAIR VALUE MEASUREMENTS Accounting standards define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. When measuring fair value, CMS Energy and Consumers are required to incorporate all assumptions that market participants would use in pricing an asset or liability, including assumptions about risk. A fair value hierarchy prioritizes inputs used to measure fair value according to their observability in the market. The three levels of the fair value hierarchy are as follows: · Level 1 inputs are unadjusted quoted prices in active markets for identical assets or liabilities. · Level 2 inputs are observable, market-based inputs, other than Level 1 prices. Level 2 inputs may include quoted prices for similar assets or liabilities in active markets, quoted prices in inactive markets, and inputs derived from or corroborated by observable market data. · Level 3 inputs are unobservable inputs that reflect CMS Energy’s or Consumers’ own assumptions about how market participants would value their assets and liabilities. To the extent possible, CMS Energy and Consumers use quoted market prices or other observable market pricing data in valuing assets and liabilities measured at fair value. If this information is unavailable, they use market-corroborated data or reasonable estimates about market participant assumptions. CMS Energy and Consumers classify fair value measurements within the fair value hierarchy based on the lowest level of input that is significant to the fair value measurement in its entirety. Assets and Liabilities Measured at Fair Value on a Recurring Basis Presented in the following table are CMS Energy’s and Consumers’ assets and liabilities recorded at fair value on a recurring basis: In Millions CMS Energy, including Consumers Consumers June 30 December 31 June 30 December 31 Assets 1 Cash equivalents $ $ $ $ Restricted cash equivalents CMS Energy common stock - - Nonqualified deferred compensation plan assets DB SERP Cash equivalents Mutual funds Derivative instruments Commodity contracts Total $ $ $ $ Liabilities 1 Nonqualified deferred compensation plan liabilities $ $ $ $ Derivative instruments Commodity contracts Total $ $ $ $ 1 All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 2 or Level 3 and which were insignificant at June 30, 2015 and December 31, 2014 . Cash Equivalents: Cash equivalents and restricted cash equivalents consist of money market funds with daily liquidity. Short-term debt instruments classified as cash equivalents or restricted cash equivalents on the consolidated balance sheets are not included since they are recorded at amortized cost. Nonqualified Deferred Compensation Plan Assets and Liabilities: The nonqualified deferred compensation plan assets consist of mutual funds, which are valued using the daily quoted NAVs that are publicly available and are the basis for transactions to buy or sell shares in each fund. CMS Energy and Consumers value their nonqualified deferred compensation plan liabilities based on the fair values of the plan assets, as they reflect what is owed to the plan participants in accordance with their investment elections. CMS Energy and Consumers report the assets in other non ‑current assets and the liabilities in other non ‑current liabilities on their consolidated balance sheets. DB SERP Assets: CMS Energy and Consumers value their DB SERP assets using a market approach that incorporates quoted market prices. The DB SERP cash equivalents consist of a money market fund with daily liquidity. The DB SERP invests in mutual funds that hold primarily fixed-income instruments of varying maturities. In order to meet their investment objectives, the funds hold investment-grade debt securities and may invest a portion of their assets in high-yield securities, foreign debt, and derivative instruments. CMS Energy and Consumers value these funds using the daily quoted NAVs that are publicly available and are the basis for transactions to buy or sell shares in each fund. CMS Energy and Consumers report their DB SERP assets in other non ‑current assets on their consolidated balance sheets. For additional details about DB SERP securities, see Note 6, Financial Instruments. Derivative Instruments: CMS Energy and Consumers value their derivative instruments using either a market approach that incorporates information from market transactions, or an income approach that discounts future expected cash flows to a present value amount. CMS Energy values its exchange-traded derivative contracts based on Level 1 quoted prices and values other derivatives using Level 2 inputs, which include commodity forward prices and credit risk factors. CMS Energy and Consumers have classified certain derivatives as Level 3 since the fair value measurements incorporate assumptions that cannot be observed or confirmed through market transactions. The majority of derivatives classified as Level 3 are FTRs held by Consumers. Consumers uses FTRs to manage price risk related to electricity transmission congestion. An FTR is a financial instrument that entitles its holder to receive compensation or requires its holder to remit payment for congestion-related transmission charges. Under regulatory accounting, all changes in fair value associated with FTRs are deferred as regulatory assets and liabilities until the instruments are settled. Due to the lack of quoted pricing information, Consumers determines the fair value of its FTRs based on Consumers’ average historical settlements. Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Level 3 Inputs Presented in the following table are reconciliations of changes in the fair values of Level 3 assets and liabilities at CMS Energy and Consumers: In Millions Three Months Ended Six Months Ended June 30 CMS Energy, including Consumers Balance at beginning of period $ $ - $ $ Total gains (losses) offset through regulatory accounting Purchases - - - Settlements - - Balance at end of period $ $ $ $ Consumers Balance at beginning of period $ $ - $ $ Total gains (losses) offset through regulatory accounting Purchases - - - Settlements - - Balance at end of period $ $ $ $ There were no unrealized gains or losses included in earnings related to assets and liabilities still held at June 30, 2015 or 2014.
Consumers Energy Company [Member]
Fair Value Measurements	5: FAIR VALUE MEASUREMENTS Accounting standards define fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. When measuring fair value, CMS Energy and Consumers are required to incorporate all assumptions that market participants would use in pricing an asset or liability, including assumptions about risk. A fair value hierarchy prioritizes inputs used to measure fair value according to their observability in the market. The three levels of the fair value hierarchy are as follows: · Level 1 inputs are unadjusted quoted prices in active markets for identical assets or liabilities. · Level 2 inputs are observable, market-based inputs, other than Level 1 prices. Level 2 inputs may include quoted prices for similar assets or liabilities in active markets, quoted prices in inactive markets, and inputs derived from or corroborated by observable market data. · Level 3 inputs are unobservable inputs that reflect CMS Energy’s or Consumers’ own assumptions about how market participants would value their assets and liabilities. To the extent possible, CMS Energy and Consumers use quoted market prices or other observable market pricing data in valuing assets and liabilities measured at fair value. If this information is unavailable, they use market-corroborated data or reasonable estimates about market participant assumptions. CMS Energy and Consumers classify fair value measurements within the fair value hierarchy based on the lowest level of input that is significant to the fair value measurement in its entirety. Assets and Liabilities Measured at Fair Value on a Recurring Basis Presented in the following table are CMS Energy’s and Consumers’ assets and liabilities recorded at fair value on a recurring basis: In Millions CMS Energy, including Consumers Consumers June 30 December 31 June 30 December 31 Assets 1 Cash equivalents $ $ $ $ Restricted cash equivalents CMS Energy common stock - - Nonqualified deferred compensation plan assets DB SERP Cash equivalents Mutual funds Derivative instruments Commodity contracts Total $ $ $ $ Liabilities 1 Nonqualified deferred compensation plan liabilities $ $ $ $ Derivative instruments Commodity contracts Total $ $ $ $ 1 All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 2 or Level 3 and which were insignificant at June 30, 2015 and December 31, 2014 . Cash Equivalents: Cash equivalents and restricted cash equivalents consist of money market funds with daily liquidity. Short-term debt instruments classified as cash equivalents or restricted cash equivalents on the consolidated balance sheets are not included since they are recorded at amortized cost. Nonqualified Deferred Compensation Plan Assets and Liabilities: The nonqualified deferred compensation plan assets consist of mutual funds, which are valued using the daily quoted NAVs that are publicly available and are the basis for transactions to buy or sell shares in each fund. CMS Energy and Consumers value their nonqualified deferred compensation plan liabilities based on the fair values of the plan assets, as they reflect what is owed to the plan participants in accordance with their investment elections. CMS Energy and Consumers report the assets in other non ‑current assets and the liabilities in other non ‑current liabilities on their consolidated balance sheets. DB SERP Assets: CMS Energy and Consumers value their DB SERP assets using a market approach that incorporates quoted market prices. The DB SERP cash equivalents consist of a money market fund with daily liquidity. The DB SERP invests in mutual funds that hold primarily fixed-income instruments of varying maturities. In order to meet their investment objectives, the funds hold investment-grade debt securities and may invest a portion of their assets in high-yield securities, foreign debt, and derivative instruments. CMS Energy and Consumers value these funds using the daily quoted NAVs that are publicly available and are the basis for transactions to buy or sell shares in each fund. CMS Energy and Consumers report their DB SERP assets in other non ‑current assets on their consolidated balance sheets. For additional details about DB SERP securities, see Note 6, Financial Instruments. Derivative Instruments: CMS Energy and Consumers value their derivative instruments using either a market approach that incorporates information from market transactions, or an income approach that discounts future expected cash flows to a present value amount. CMS Energy values its exchange-traded derivative contracts based on Level 1 quoted prices and values other derivatives using Level 2 inputs, which include commodity forward prices and credit risk factors. CMS Energy and Consumers have classified certain derivatives as Level 3 since the fair value measurements incorporate assumptions that cannot be observed or confirmed through market transactions. The majority of derivatives classified as Level 3 are FTRs held by Consumers. Consumers uses FTRs to manage price risk related to electricity transmission congestion. An FTR is a financial instrument that entitles its holder to receive compensation or requires its holder to remit payment for congestion-related transmission charges. Under regulatory accounting, all changes in fair value associated with FTRs are deferred as regulatory assets and liabilities until the instruments are settled. Due to the lack of quoted pricing information, Consumers determines the fair value of its FTRs based on Consumers’ average historical settlements. Assets and Liabilities Measured at Fair Value on a Recurring Basis Using Significant Level 3 Inputs Presented in the following table are reconciliations of changes in the fair values of Level 3 assets and liabilities at CMS Energy and Consumers: In Millions Three Months Ended Six Months Ended June 30 CMS Energy, including Consumers Balance at beginning of period $ $ - $ $ Total gains (losses) offset through regulatory accounting Purchases - - - Settlements - - Balance at end of period $ $ $ $ Consumers Balance at beginning of period $ $ - $ $ Total gains (losses) offset through regulatory accounting Purchases - - - Settlements - - Balance at end of period $ $ $ $ There were no unrealized gains or losses included in earnings related to assets and liabilities still held at June 30, 2015 or 2014.

Financial Instruments

Financial Instruments	6 Months Ended
	Jun. 30, 2015
Financial Instruments	6: FINANCIAL INSTRUMENTS Presented in the following table are the carrying amounts and fair values, by level within the fair value hierarchy, of CMS Energy’s and Consumers’ financial instruments that are not recorded at fair value. The table does not include information on cash, cash equivalents, short-term accounts and notes receivable, short-term investments, and current liabilities since the carrying amounts of these items approximate their fair values because of their short-term nature. For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 5, Fair Value Measurements. In Millions June 30, 2015 December 31, 2014 Fair Value Fair Value Carrying Level Carrying Level Amount Total Amount Total CMS Energy, including Consumers Securities held to maturity $ $ $ - $ $ - $ $ $ - $ $ - Notes receivable 1 - - - - Long-term debt 2 - - Consumers Long-term debt 3 $ $ $ - $ $ $ $ $ - $ $ 1 Includes current portion of notes receivable of $113 million at June 30, 2015 and $ 138 million at December 31, 2014 . 2 Includes current portion of long-term debt of $498 million at June 30, 2015 and $ 519 million at December 31, 2014 . 3 Includes current portion of long-term debt of $100 million at June 30, 2015 and $ 124 million at December 31, 2014 . Notes receivable consist of EnerBank’s fixed-rate installment loans. EnerBank estimates the fair value of these loans using a discounted cash flows technique that incorporates market interest rates as well as assumptions about the remaining life of the loans and credit risk. CMS Energy and Consumers estimate the fair value of their long-term debt using quoted prices from market trades of the debt, if available. In the absence of quoted prices, CMS Energy and Consumers calculate market yields and prices for the debt using a matrix method that incorporates market data for similarly rated debt. Depending on the information available, other valuation techniques and models may be used that rely on assumptions that cannot be observed or confirmed through market transactions. The effects of third-party credit enhancements are excluded from the fair value measurements of long-term debt. At June 30, 2015 and December 31, 2014 , CMS Energy’s long-term debt included $ 103 million principal amount that was supported by third-party credit enhancements. This entire principal amount was at Consumers. Presented in the following table are CMS Energy’s and Consumers’ investment securities classified as available for sale or held to maturity: In Millions June 30, 2015 December 31, 2014 Unrealized Unrealized Fair Unrealized Unrealized Fair Cost Gains Losses Value Cost Gains Losses Value CMS Energy, including Consumers Available for sale DB SERP Mutual funds $ $ - $ $ $ $ - $ $ Held to maturity Debt securities - - - - Consumers Available for sale DB SERP Mutual funds $ $ - $ $ $ $ - $ $ CMS Energy common stock - - The mutual funds classified as available for sale hold primarily fixed-income instruments of varying maturities. During the six months ended June 30, 2015 , CMS Energy contributed $25 million to the DB SERP, which included a contribution of $17 million by Consumers. Debt securities classified as held to maturity consist primarily of mortgage-backed securities and Utah Housing Corporation bonds held by EnerBank. Consumers recognized a gain of $ 9 million in January 2015 associated with the transfer of shares of CMS Energy common stock to a related charitable foundation. The gain reflected the excess of fair value over cost of the stock donated and was recorded in other income on Consumers’ consolidated statements of income. The gain was eliminated on CMS Energy’s consolidated statements of income.
Consumers Energy Company [Member]
Financial Instruments	6: FINANCIAL INSTRUMENTS Presented in the following table are the carrying amounts and fair values, by level within the fair value hierarchy, of CMS Energy’s and Consumers’ financial instruments that are not recorded at fair value. The table does not include information on cash, cash equivalents, short-term accounts and notes receivable, short-term investments, and current liabilities since the carrying amounts of these items approximate their fair values because of their short-term nature. For information about assets and liabilities recorded at fair value and for additional details regarding the fair value hierarchy, see Note 5, Fair Value Measurements. In Millions June 30, 2015 December 31, 2014 Fair Value Fair Value Carrying Level Carrying Level Amount Total Amount Total CMS Energy, including Consumers Securities held to maturity $ $ $ - $ $ - $ $ $ - $ $ - Notes receivable 1 - - - - Long-term debt 2 - - Consumers Long-term debt 3 $ $ $ - $ $ $ $ $ - $ $ 1 Includes current portion of notes receivable of $113 million at June 30, 2015 and $ 138 million at December 31, 2014 . 2 Includes current portion of long-term debt of $498 million at June 30, 2015 and $ 519 million at December 31, 2014 . 3 Includes current portion of long-term debt of $100 million at June 30, 2015 and $ 124 million at December 31, 2014 . Notes receivable consist of EnerBank’s fixed-rate installment loans. EnerBank estimates the fair value of these loans using a discounted cash flows technique that incorporates market interest rates as well as assumptions about the remaining life of the loans and credit risk. CMS Energy and Consumers estimate the fair value of their long-term debt using quoted prices from market trades of the debt, if available. In the absence of quoted prices, CMS Energy and Consumers calculate market yields and prices for the debt using a matrix method that incorporates market data for similarly rated debt. Depending on the information available, other valuation techniques and models may be used that rely on assumptions that cannot be observed or confirmed through market transactions. The effects of third-party credit enhancements are excluded from the fair value measurements of long-term debt. At June 30, 2015 and December 31, 2014 , CMS Energy’s long-term debt included $ 103 million principal amount that was supported by third-party credit enhancements. This entire principal amount was at Consumers. Presented in the following table are CMS Energy’s and Consumers’ investment securities classified as available for sale or held to maturity: In Millions June 30, 2015 December 31, 2014 Unrealized Unrealized Fair Unrealized Unrealized Fair Cost Gains Losses Value Cost Gains Losses Value CMS Energy, including Consumers Available for sale DB SERP Mutual funds $ $ - $ $ $ $ - $ $ Held to maturity Debt securities - - - - Consumers Available for sale DB SERP Mutual funds $ $ - $ $ $ $ - $ $ CMS Energy common stock - - The mutual funds classified as available for sale hold primarily fixed-income instruments of varying maturities. During the six months ended June 30, 2015 , CMS Energy contributed $25 million to the DB SERP, which included a contribution of $17 million by Consumers. Debt securities classified as held to maturity consist primarily of mortgage-backed securities and Utah Housing Corporation bonds held by EnerBank. Consumers recognized a gain of $ 9 million in January 2015 associated with the transfer of shares of CMS Energy common stock to a related charitable foundation. The gain reflected the excess of fair value over cost of the stock donated and was recorded in other income on Consumers’ consolidated statements of income. The gain was eliminated on CMS Energy’s consolidated statements of income.

Notes Receivable

Notes Receivable	6 Months Ended
	Jun. 30, 2015
Notes Receivable [Abstract]
Notes Receivable	7: NOTES RECEIVABLE Presented in the following table are details of CMS Energy’s current and non ‑current notes receivable: In Millions June 30, 2015 December 31, 2014 CMS Energy Current EnerBank notes receivable, net of allowance for loan losses $ $ EnerBank notes receivable held for sale - Other Non-current EnerBank notes receivable, net of allowance for loan losses Total notes receivable $ $ EnerBank notes receivable are unsecured consumer installment loans for financing home improvements. EnerBank records its notes receivable at cost, less allowance for loan losses. In May 2015, EnerBank completed a sale of notes receivable, receiving proceeds of $48 million and recording an insignificant gain. The allowance for loan losses is a valuation allowance to reflect estimated credit losses. The allowance is increased by the provision for loan losses and decreased by loan charge-offs net of recoveries. Management estimates the allowance balance required by taking into consideration historical loan loss experience, the nature and volume of the portfolio, economic conditions, and other factors. Loan losses are charged against the allowance when the loss is confirmed, but no later than the point at which a loan becomes 120 days past due. Loans that are 30 days or more past due are considered delinquent. The balance of EnerBank’s delinquent consumer loans was $5 million at June 30, 2015 and December 31, 2014 . At June 30, 2015 and December 31, 2014 , $ 1 million of EnerBank’s loans had been modified as troubled debt restructurings.

Retirement Benefits

Retirement Benefits	6 Months Ended
	Jun. 30, 2015
Retirement Benefits	8: RETIREMENT BENEFITS CMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees under a number of different plans. Following amendments to the OPEB Plan in 2013, Consumers’ OPEB costs decreased substantially and, as a result, the OPEB Plan was fully funded at December 31, 20 13. In September 2014, the MPSC approved a settlement agreement addressing Consumers’ OPEB Plan funding. In accordance with the settlement agreement, Consumers contributed $25 million to the plan in October 2014 and $29 million in February 2015. Consumers has suspended further contributions until the MPSC determines funding requirements in future general rate cases. 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 DB Pension Plan OPEB Plan Three Months Ended Six Months Ended Three Months Ended Six Months Ended June 30 CMS Energy, including Consumers Net periodic cost (credit) Service cost $ $ $ $ $ $ $ $ Interest expense Expected return on plan assets Amortization of: Net loss Prior service cost (credit) Net periodic cost (credit) $ $ $ $ $ $ $ $ Consumers Net periodic cost (credit) Service cost $ $ $ $ $ $ $ $ Interest expense Expected return on plan assets Amortization of: Net loss Prior service cost (credit) Net periodic cost (credit) $ $ $ $ $ $ $ $
Consumers Energy Company [Member]
Retirement Benefits	8: RETIREMENT BENEFITS CMS Energy and Consumers provide pension, OPEB, and other retirement benefits to employees under a number of different plans. Following amendments to the OPEB Plan in 2013, Consumers’ OPEB costs decreased substantially and, as a result, the OPEB Plan was fully funded at December 31, 20 13. In September 2014, the MPSC approved a settlement agreement addressing Consumers’ OPEB Plan funding. In accordance with the settlement agreement, Consumers contributed $25 million to the plan in October 2014 and $29 million in February 2015. Consumers has suspended further contributions until the MPSC determines funding requirements in future general rate cases. 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 DB Pension Plan OPEB Plan Three Months Ended Six Months Ended Three Months Ended Six Months Ended June 30 CMS Energy, including Consumers Net periodic cost (credit) Service cost $ $ $ $ $ $ $ $ Interest expense Expected return on plan assets Amortization of: Net loss Prior service cost (credit) Net periodic cost (credit) $ $ $ $ $ $ $ $ Consumers Net periodic cost (credit) Service cost $ $ $ $ $ $ $ $ Interest expense Expected return on plan assets Amortization of: Net loss Prior service cost (credit) Net periodic cost (credit) $ $ $ $ $ $ $ $

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2015
Income Taxes	9: INCOME TAXES Presented in the following table is a reconciliation of the statutory U.S. federal income tax rate to the effective income tax rate from continuing operations, excluding noncontrolling interests: Six Months Ended June 30 CMS Energy, including Consumers U.S. federal income tax rate % % Increase (decrease) in income taxes from: State and local income taxes, net of federal effect Accelerated flow-through of regulatory tax benefits Other, net Effective tax rate % % Consumers U.S. federal income tax rate % % Increase (decrease) in income taxes from: State and local income taxes, net of federal effect Accelerated flow-through of regulatory tax benefits Other, net Effective tax rate % % Prior to 2014, Consumers recognized the income tax benefits associated with the removal costs of plant placed in service before 1993 as payments were made and the tax benefits were flowed through to customers. In 2013, the MPSC issued an order authorizing Consumers to flow through to customers the income tax benefits on a straight-line basis over an accelerated period. This regulatory treatment, which Consumers implemented in January 2014, will accelerate the return of $ 209 million of income tax benefits over five years to electric customers and $ 260 million of income tax benefits over 12 years to gas customers. T his treatment reduced Consumers’ income tax expense by $20 million for the six months ended June 30, 2015 and by $23 million f or the six months ended June 30, 2014 .
Consumers Energy Company [Member]
Income Taxes	9: INCOME TAXES Presented in the following table is a reconciliation of the statutory U.S. federal income tax rate to the effective income tax rate from continuing operations, excluding noncontrolling interests: Six Months Ended June 30 CMS Energy, including Consumers U.S. federal income tax rate % % Increase (decrease) in income taxes from: State and local income taxes, net of federal effect Accelerated flow-through of regulatory tax benefits Other, net Effective tax rate % % Consumers U.S. federal income tax rate % % Increase (decrease) in income taxes from: State and local income taxes, net of federal effect Accelerated flow-through of regulatory tax benefits Other, net Effective tax rate % % Prior to 2014, Consumers recognized the income tax benefits associated with the removal costs of plant placed in service before 1993 as payments were made and the tax benefits were flowed through to customers. In 2013, the MPSC issued an order authorizing Consumers to flow through to customers the income tax benefits on a straight-line basis over an accelerated period. This regulatory treatment, which Consumers implemented in January 2014, will accelerate the return of $ 209 million of income tax benefits over five years to electric customers and $ 260 million of income tax benefits over 12 years to gas customers. T his treatment reduced Consumers’ income tax expense by $20 million for the six months ended June 30, 2015 and by $23 million f or the six months ended June 30, 2014 .

Earnings Per Share - CMS Energy

Earnings Per Share - CMS Energy	6 Months Ended
	Jun. 30, 2015
Earnings Per Share - CMS Energy [Abstract]
Earnings Per Share - CMS Energy	10: EARNINGS PER SHARE – CMS ENERGY Presented in the following table are CMS Energy’s basic and diluted EPS computations based on income from continuing operations: In Millions, Except Per Share Amounts Three Months Ended Six Months Ended June 30 Income available to common stockholders Income from continuing operations $ $ $ $ Less income attributable to noncontrolling interests Income from continuing operations available to common stockholders – basic and diluted $ $ $ $ Average common shares outstanding Weighted-average shares – basic Add dilutive contingently convertible securities - - Add dilutive non-vested stock awards Weighted-average shares – diluted Income from continuing operations per average common share available to common stockholders Basic $ $ $ $ Diluted Contingently Convertible Securities In June 2014, CMS Energy redeemed its remaining contingently convertible securities. For the periods those securities were outstanding, they diluted EPS to the extent that the conversion value of the securities, which was based on the average market price of CMS Energy common stock, exceeded their principal value. Non ‑vested Stock Awards CMS Energy’s non ‑vested stock awards are composed of participating and non ‑participating securities. The participating securities accrue cash dividends when common stockholders receive dividends. Since the recipient is not required to return the dividends to CMS Energy if the recipient forfeits the award, the non ‑vested stock awards are considered participating securities. As such, the participating non ‑vested stock awards were included in the computation of basic EPS. The non ‑participating securities accrue stock dividends that vest concurrently with the stock award. If the recipient forfeits the award, the stock dividends accrued on the non ‑participating securities are also forfeited. Accordingly, the non ‑participating awards and stock dividends were included in the computation of diluted EPS, but not basic EPS.

Reportable Segments

Reportable Segments	6 Months Ended
	Jun. 30, 2015
Reportable Segments	11: REPORTABLE SEGMENTS Reportable segments consist of business units defined by the products and services they offer. CMS Energy and Consumers evaluate the performance of each segment based on its contribution to net income available to CMS Energy’s common stockholders. CMS Energy The reportable segments for CMS Energy are: · electric utility, consisting of regulated activities associated with the generation and distribution of electricity in Michigan; · gas utility, consisting of regulated activities associated with the transportation, storage, and distribution of natural gas in Michigan; and · enterprises, consisting of various subsidiaries engaging primarily in domestic independent power production. CMS Energy presents EnerBank and corporate interest and other expenses within other reconciling items. Consumers The reportable segments for Consumers are: · electric utility, consisting of regulated activities associated with the generation and distribution of electricity in Michigan; and · gas utility, consisting of regulated activities associated with the transportation, storage, and distribution of natural gas in Michigan. Consumers’ other consolidated entities are presented within other reconciling items. Presented in the following tables is financial information by reportable segment: In Millions Three Months Ended Six Months Ended June 30 CMS Energy, including Consumers Operating revenue Electric utility $ $ $ $ Gas utility Enterprises Other reconciling items Total operating revenue – CMS Energy $ $ $ $ Consumers Operating revenue Electric utility $ $ $ $ Gas utility Other reconciling items - - Total operating revenue – Consumers $ $ $ $ CMS Energy, including Consumers Net income (loss) available to common stockholders Electric utility $ $ $ $ Gas utility Enterprises - Other reconciling items Total net income available to common stockholders – CMS Energy $ $ $ $ Consumers Net income available to common stockholder Electric utility $ $ $ $ Gas utility Other reconciling items - - Total net income available to common stockholder – Consumers $ $ $ $ In Millions June 30, 2015 December 31, 2014 CMS Energy, including Consumers Plant, property, and equipment, gross Electric utility 1 $ $ Gas utility 1 Enterprises Other reconciling items Total plant, property, and equipment, gross – CMS Energy $ $ Consumers Plant, property, and equipment, gross Electric utility 1 $ $ Gas utility 1 Other reconciling items Total plant, property, and equipment, gross – Consumers $ $ CMS Energy, including Consumers Total assets Electric utility 1 $ $ Gas utility 1 Enterprises Other reconciling items Total assets – CMS Energy $ $ Consumers Total assets Electric utility 1 $ $ Gas utility 1 Other reconciling items Total assets – Consumers $ $ 1 Amounts include a portion of Consumers’ other common assets attributable to both the electric and gas utility businesses.
Consumers Energy Company [Member]
Reportable Segments	11: REPORTABLE SEGMENTS Reportable segments consist of business units defined by the products and services they offer. CMS Energy and Consumers evaluate the performance of each segment based on its contribution to net income available to CMS Energy’s common stockholders. CMS Energy The reportable segments for CMS Energy are: · electric utility, consisting of regulated activities associated with the generation and distribution of electricity in Michigan; · gas utility, consisting of regulated activities associated with the transportation, storage, and distribution of natural gas in Michigan; and · enterprises, consisting of various subsidiaries engaging primarily in domestic independent power production. CMS Energy presents EnerBank and corporate interest and other expenses within other reconciling items. Consumers The reportable segments for Consumers are: · electric utility, consisting of regulated activities associated with the generation and distribution of electricity in Michigan; and · gas utility, consisting of regulated activities associated with the transportation, storage, and distribution of natural gas in Michigan. Consumers’ other consolidated entities are presented within other reconciling items. Presented in the following tables is financial information by reportable segment: In Millions Three Months Ended Six Months Ended June 30 CMS Energy, including Consumers Operating revenue Electric utility $ $ $ $ Gas utility Enterprises Other reconciling items Total operating revenue – CMS Energy $ $ $ $ Consumers Operating revenue Electric utility $ $ $ $ Gas utility Other reconciling items - - Total operating revenue – Consumers $ $ $ $ CMS Energy, including Consumers Net income (loss) available to common stockholders Electric utility $ $ $ $ Gas utility Enterprises - Other reconciling items Total net income available to common stockholders – CMS Energy $ $ $ $ Consumers Net income available to common stockholder Electric utility $ $ $ $ Gas utility Other reconciling items - - Total net income available to common stockholder – Consumers $ $ $ $ In Millions June 30, 2015 December 31, 2014 CMS Energy, including Consumers Plant, property, and equipment, gross Electric utility 1 $ $ Gas utility 1 Enterprises Other reconciling items Total plant, property, and equipment, gross – CMS Energy $ $ Consumers Plant, property, and equipment, gross Electric utility 1 $ $ Gas utility 1 Other reconciling items Total plant, property, and equipment, gross – Consumers $ $ CMS Energy, including Consumers Total assets Electric utility 1 $ $ Gas utility 1 Enterprises Other reconciling items Total assets – CMS Energy $ $ Consumers Total assets Electric utility 1 $ $ Gas utility 1 Other reconciling items Total assets – Consumers $ $ 1 Amounts include a portion of Consumers’ other common assets attributable to both the electric and gas utility businesses.

Notes Receivable (Policy)

Notes Receivable (Policy)	6 Months Ended
	Jun. 30, 2015
Notes Receivable [Abstract]
Allowance For Loan Losses Policy	The allowance for loan losses is a valuation allowance to reflect estimated credit losses. The allowance is increased by the provision for loan losses and decreased by loan charge-offs net of recoveries. Management estimates the allowance balance required by taking into consideration historical loan loss experience, the nature and volume of the portfolio, economic conditions, and other factors. Loan losses are charged against the allowance when the loss is confirmed, but no later than the point at which a loan becomes 120 days past due.

Regulatory Matters (Tables)

Regulatory Matters (Tables)	6 Months Ended
	Jun. 30, 2015
Electric Rate Case [Member] | Consumers Energy Company [Member]
Public Utility, Property, Plant and Equipment [Line Items]
Schedule of Requested Annual Rate Increase	In Millions Components of the rate increase Investment in rate base $ Addition of natural gas-fueled electric generating plant Operating and maintenance costs Cost of capital Working capital Cost-reduction initiatives Gross margin Total $

Contingencies And Commitments (

Contingencies And Commitments (Tables)	6 Months Ended
	Jun. 30, 2015
Site Contingency [Line Items]
Guarantees	In Millions Maximum Carrying Guarantee Description Issue Date Expiration Date Obligation Amount CMS Energy, including Consumers Indemnity obligations from asset sales and other agreements Various Various through August 2029 $ 1 $ Guarantees Various Various through March 2021 - Consumers Indemnity obligations and other guarantees Various Various through August 2029 $ $ 1 The majority of this amount arises from stock and asset sale agreements under which CMS Energy or a subsidiary of CMS Energy, other than Consumers, indemnified the purchaser for losses resulting from various matters, including claims related to tax disputes, claims related to power purchase agreements, and defects in title to the assets or stock sold to the purchaser by CMS Energy subsidiaries. Except for items described elsewhere in this Note, CMS Energy believes the likelihood of material loss to be remote for the indemnity obligations not recorded as liabilities.
Schedule Of Guarantees, Other Information	Guarantee Description How Guarantee Arose Events That Would Require Performance CMS Energy, including Consumers Indemnity obligations from asset sales and other agreements Stock and asset sale agreements Findings of misrepresentation, breach of warranties, tax claims, and other specific events or circumstances Guarantees Normal operating activity Nonperformance or non-payment by a subsidiary under a related contract Consumers Indemnity obligations and other guarantees Normal operating activity Nonperformance or claims made by a third party under a related contract
Consumers Energy Company [Member]
Site Contingency [Line Items]
Expected Remediation Cost By Year	In Millions Consumers Remediation and other response activity costs $ $ $ $ $
Guarantees	In Millions Maximum Carrying Guarantee Description Issue Date Expiration Date Obligation Amount CMS Energy, including Consumers Indemnity obligations from asset sales and other agreements Various Various through August 2029 $ 1 $ Guarantees Various Various through March 2021 - Consumers Indemnity obligations and other guarantees Various Various through August 2029 $ $ 1 The majority of this amount arises from stock and asset sale agreements under which CMS Energy or a subsidiary of CMS Energy, other than Consumers, indemnified the purchaser for losses resulting from various matters, including claims related to tax disputes, claims related to power purchase agreements, and defects in title to the assets or stock sold to the purchaser by CMS Energy subsidiaries. Except for items described elsewhere in this Note, CMS Energy believes the likelihood of material loss to be remote for the indemnity obligations not recorded as liabilities.
Schedule Of Guarantees, Other Information	Guarantee Description How Guarantee Arose Events That Would Require Performance CMS Energy, including Consumers Indemnity obligations from asset sales and other agreements Stock and asset sale agreements Findings of misrepresentation, breach of warranties, tax claims, and other specific events or circumstances Guarantees Normal operating activity Nonperformance or non-payment by a subsidiary under a related contract Consumers Indemnity obligations and other guarantees Normal operating activity Nonperformance or claims made by a third party under a related contract
Bay Harbor [Member]
Site Contingency [Line Items]
Expected Remediation Cost By Year	In Millions CMS Energy Long-term liquid disposal and operating and maintenance costs $ $ $ $ $

Financings And Capitalization (

Financings And Capitalization (Tables)	6 Months Ended
	Jun. 30, 2015
Revolving Credit Facilities	In Millions Letters of Credit Expiration Date Amount of Facility Amount Borrowed Outstanding Amount Available CMS Energy parent May 27, 2020 1 $ $ - $ $ Consumers May 27, 2020 2 $ $ - $ $ May 9, 2018 2 - - 1 During the six months ended June 30, 2015 , CMS Energy’s average borrowings totaled $61 million with a weighted-average interest rate of 1.43 percent. Obligations under this facility are secured by Consumers common stock. 2 Obligations under this facility are secured by FMBs of Consumers.
Issuance Of Stock	Number of Average Proceeds Shares Issued Price per Share (In Millions) April – May 2015 $ $ July 2-7, 2015 Total $ $
Consumers Energy Company [Member]
Revolving Credit Facilities	In Millions Letters of Credit Expiration Date Amount of Facility Amount Borrowed Outstanding Amount Available CMS Energy parent May 27, 2020 1 $ $ - $ $ Consumers May 27, 2020 2 $ $ - $ $ May 9, 2018 2 - - 1 During the six months ended June 30, 2015 , CMS Energy’s average borrowings totaled $61 million with a weighted-average interest rate of 1.43 percent. Obligations under this facility are secured by Consumers common stock. 2 Obligations under this facility are secured by FMBs of Consumers.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	6 Months Ended
	Jun. 30, 2015
Assets And Liabilities Measured At Fair Value On A Recurring Basis	In Millions CMS Energy, including Consumers Consumers June 30 December 31 June 30 December 31 Assets 1 Cash equivalents $ $ $ $ Restricted cash equivalents CMS Energy common stock - - Nonqualified deferred compensation plan assets DB SERP Cash equivalents Mutual funds Derivative instruments Commodity contracts Total $ $ $ $ Liabilities 1 Nonqualified deferred compensation plan liabilities $ $ $ $ Derivative instruments Commodity contracts Total $ $ $ $ 1 All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 2 or Level 3 and which were insignificant at June 30, 2015 and December 31, 2014 .
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs	In Millions Three Months Ended Six Months Ended June 30 CMS Energy, including Consumers Balance at beginning of period $ $ - $ $ Total gains (losses) offset through regulatory accounting Purchases - - - Settlements - - Balance at end of period $ $ $ $ Consumers Balance at beginning of period $ $ - $ $ Total gains (losses) offset through regulatory accounting Purchases - - - Settlements - - Balance at end of period $ $ $ $
Consumers Energy Company [Member]
Assets And Liabilities Measured At Fair Value On A Recurring Basis	In Millions CMS Energy, including Consumers Consumers June 30 December 31 June 30 December 31 Assets 1 Cash equivalents $ $ $ $ Restricted cash equivalents CMS Energy common stock - - Nonqualified deferred compensation plan assets DB SERP Cash equivalents Mutual funds Derivative instruments Commodity contracts Total $ $ $ $ Liabilities 1 Nonqualified deferred compensation plan liabilities $ $ $ $ Derivative instruments Commodity contracts Total $ $ $ $ 1 All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 2 or Level 3 and which were insignificant at June 30, 2015 and December 31, 2014 .
Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs	In Millions Three Months Ended Six Months Ended June 30 CMS Energy, including Consumers Balance at beginning of period $ $ - $ $ Total gains (losses) offset through regulatory accounting Purchases - - - Settlements - - Balance at end of period $ $ $ $ Consumers Balance at beginning of period $ $ - $ $ Total gains (losses) offset through regulatory accounting Purchases - - - Settlements - - Balance at end of period $ $ $ $

Financial Instruments (Tables)

Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2015
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments	In Millions June 30, 2015 December 31, 2014 Fair Value Fair Value Carrying Level Carrying Level Amount Total Amount Total CMS Energy, including Consumers Securities held to maturity $ $ $ - $ $ - $ $ $ - $ $ - Notes receivable 1 - - - - Long-term debt 2 - - Consumers Long-term debt 3 $ $ $ - $ $ $ $ $ - $ $ 1 Includes current portion of notes receivable of $113 million at June 30, 2015 and $ 138 million at December 31, 2014 . 2 Includes current portion of long-term debt of $498 million at June 30, 2015 and $ 519 million at December 31, 2014 . 3 Includes current portion of long-term debt of $100 million at June 30, 2015 and $ 124 million at December 31, 2014 .
Schedule Of Investment Securities	In Millions June 30, 2015 December 31, 2014 Unrealized Unrealized Fair Unrealized Unrealized Fair Cost Gains Losses Value Cost Gains Losses Value CMS Energy, including Consumers Available for sale DB SERP Mutual funds $ $ - $ $ $ $ - $ $ Held to maturity Debt securities - - - - Consumers Available for sale DB SERP Mutual funds $ $ - $ $ $ $ - $ $ CMS Energy common stock - -
Consumers Energy Company [Member]
Schedule Of Carrying Amounts And Fair Values Of Financial Instruments	In Millions June 30, 2015 December 31, 2014 Fair Value Fair Value Carrying Level Carrying Level Amount Total Amount Total CMS Energy, including Consumers Securities held to maturity $ $ $ - $ $ - $ $ $ - $ $ - Notes receivable 1 - - - - Long-term debt 2 - - Consumers Long-term debt 3 $ $ $ - $ $ $ $ $ - $ $ 1 Includes current portion of notes receivable of $113 million at June 30, 2015 and $ 138 million at December 31, 2014 . 2 Includes current portion of long-term debt of $498 million at June 30, 2015 and $ 519 million at December 31, 2014 . 3 Includes current portion of long-term debt of $100 million at June 30, 2015 and $ 124 million at December 31, 2014 .
Schedule Of Investment Securities	In Millions June 30, 2015 December 31, 2014 Unrealized Unrealized Fair Unrealized Unrealized Fair Cost Gains Losses Value Cost Gains Losses Value CMS Energy, including Consumers Available for sale DB SERP Mutual funds $ $ - $ $ $ $ - $ $ Held to maturity Debt securities - - - - Consumers Available for sale DB SERP Mutual funds $ $ - $ $ $ $ - $ $ CMS Energy common stock - -

Notes Receivable (Tables)

Notes Receivable (Tables)	6 Months Ended
	Jun. 30, 2015
Notes Receivable [Abstract]
Schedule Of Current And Non-Current Notes Receivable	In Millions June 30, 2015 December 31, 2014 CMS Energy Current EnerBank notes receivable, net of allowance for loan losses $ $ EnerBank notes receivable held for sale - Other Non-current EnerBank notes receivable, net of allowance for loan losses Total notes receivable $ $

Retirement Benefits (Tables)

Retirement Benefits (Tables)	6 Months Ended
	Jun. 30, 2015
Defined Benefit Plan Disclosure [Line Items]
Schedule Of Net Benefit Costs	In Millions DB Pension Plan OPEB Plan Three Months Ended Six Months Ended Three Months Ended Six Months Ended June 30 CMS Energy, including Consumers Net periodic cost (credit) Service cost $ $ $ $ $ $ $ $ Interest expense Expected return on plan assets Amortization of: Net loss Prior service cost (credit) Net periodic cost (credit) $ $ $ $ $ $ $ $ Consumers Net periodic cost (credit) Service cost $ $ $ $ $ $ $ $ Interest expense Expected return on plan assets Amortization of: Net loss Prior service cost (credit) Net periodic cost (credit) $ $ $ $ $ $ $ $
Consumers Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Schedule Of Net Benefit Costs	In Millions DB Pension Plan OPEB Plan Three Months Ended Six Months Ended Three Months Ended Six Months Ended June 30 CMS Energy, including Consumers Net periodic cost (credit) Service cost $ $ $ $ $ $ $ $ Interest expense Expected return on plan assets Amortization of: Net loss Prior service cost (credit) Net periodic cost (credit) $ $ $ $ $ $ $ $ Consumers Net periodic cost (credit) Service cost $ $ $ $ $ $ $ $ Interest expense Expected return on plan assets Amortization of: Net loss Prior service cost (credit) Net periodic cost (credit) $ $ $ $ $ $ $ $

Income Taxes (Tables)

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2015
Schedule Of Effective Income Tax Rate Reconciliation	Six Months Ended June 30 CMS Energy, including Consumers U.S. federal income tax rate % % Increase (decrease) in income taxes from: State and local income taxes, net of federal effect Accelerated flow-through of regulatory tax benefits Other, net Effective tax rate % % Consumers U.S. federal income tax rate % % Increase (decrease) in income taxes from: State and local income taxes, net of federal effect Accelerated flow-through of regulatory tax benefits Other, net Effective tax rate % %
Consumers Energy Company [Member]
Schedule Of Effective Income Tax Rate Reconciliation	Six Months Ended June 30 CMS Energy, including Consumers U.S. federal income tax rate % % Increase (decrease) in income taxes from: State and local income taxes, net of federal effect Accelerated flow-through of regulatory tax benefits Other, net Effective tax rate % % Consumers U.S. federal income tax rate % % Increase (decrease) in income taxes from: State and local income taxes, net of federal effect Accelerated flow-through of regulatory tax benefits Other, net Effective tax rate % %

Earnings Per Share - CMS Ener29

Earnings Per Share - CMS Energy (Tables)	6 Months Ended
	Jun. 30, 2015
Earnings Per Share - CMS Energy [Abstract]
Basic And Diluted EPS Computations	In Millions, Except Per Share Amounts Three Months Ended Six Months Ended June 30 Income available to common stockholders Income from continuing operations $ $ $ $ Less income attributable to noncontrolling interests Income from continuing operations available to common stockholders – basic and diluted $ $ $ $ Average common shares outstanding Weighted-average shares – basic Add dilutive contingently convertible securities - - Add dilutive non-vested stock awards Weighted-average shares – diluted Income from continuing operations per average common share available to common stockholders Basic $ $ $ $ Diluted

Reportable Segments (Tables)

Reportable Segments (Tables)	6 Months Ended
	Jun. 30, 2015
Schedule Of Financial Information By Reportable Segments	In Millions Three Months Ended Six Months Ended June 30 CMS Energy, including Consumers Operating revenue Electric utility $ $ $ $ Gas utility Enterprises Other reconciling items Total operating revenue – CMS Energy $ $ $ $ Consumers Operating revenue Electric utility $ $ $ $ Gas utility Other reconciling items - - Total operating revenue – Consumers $ $ $ $ CMS Energy, including Consumers Net income (loss) available to common stockholders Electric utility $ $ $ $ Gas utility Enterprises - Other reconciling items Total net income available to common stockholders – CMS Energy $ $ $ $ Consumers Net income available to common stockholder Electric utility $ $ $ $ Gas utility Other reconciling items - - Total net income available to common stockholder – Consumers $ $ $ $ In Millions June 30, 2015 December 31, 2014 CMS Energy, including Consumers Plant, property, and equipment, gross Electric utility 1 $ $ Gas utility 1 Enterprises Other reconciling items Total plant, property, and equipment, gross – CMS Energy $ $ Consumers Plant, property, and equipment, gross Electric utility 1 $ $ Gas utility 1 Other reconciling items Total plant, property, and equipment, gross – Consumers $ $ CMS Energy, including Consumers Total assets Electric utility 1 $ $ Gas utility 1 Enterprises Other reconciling items Total assets – CMS Energy $ $ Consumers Total assets Electric utility 1 $ $ Gas utility 1 Other reconciling items Total assets – Consumers $ $ 1 Amounts include a portion of Consumers’ other common assets attributable to both the electric and gas utility businesses.
Consumers Energy Company [Member]
Schedule Of Financial Information By Reportable Segments	In Millions Three Months Ended Six Months Ended June 30 CMS Energy, including Consumers Operating revenue Electric utility $ $ $ $ Gas utility Enterprises Other reconciling items Total operating revenue – CMS Energy $ $ $ $ Consumers Operating revenue Electric utility $ $ $ $ Gas utility Other reconciling items - - Total operating revenue – Consumers $ $ $ $ CMS Energy, including Consumers Net income (loss) available to common stockholders Electric utility $ $ $ $ Gas utility Enterprises - Other reconciling items Total net income available to common stockholders – CMS Energy $ $ $ $ Consumers Net income available to common stockholder Electric utility $ $ $ $ Gas utility Other reconciling items - - Total net income available to common stockholder – Consumers $ $ $ $ In Millions June 30, 2015 December 31, 2014 CMS Energy, including Consumers Plant, property, and equipment, gross Electric utility 1 $ $ Gas utility 1 Enterprises Other reconciling items Total plant, property, and equipment, gross – CMS Energy $ $ Consumers Plant, property, and equipment, gross Electric utility 1 $ $ Gas utility 1 Other reconciling items Total plant, property, and equipment, gross – Consumers $ $ CMS Energy, including Consumers Total assets Electric utility 1 $ $ Gas utility 1 Enterprises Other reconciling items Total assets – CMS Energy $ $ Consumers Total assets Electric utility 1 $ $ Gas utility 1 Other reconciling items Total assets – Consumers $ $ 1 Amounts include a portion of Consumers’ other common assets attributable to both the electric and gas utility businesses.

New Accounting Standards (Detai

New Accounting Standards (Details) $ in Millions	Jun. 30, 2015USD ($)
Unamortized debt issuance costs	$ 43
Consumers Energy Company [Member]
Unamortized debt issuance costs	$ 23

Regulatory Matters (Narrative)

Regulatory Matters (Narrative) (Details) - Consumers Energy Company [Member] - USD ($) $ in Millions	1 Months Ended			6 Months Ended
	Jan. 31, 2015	Dec. 31, 2014	Jul. 31, 2014	Jun. 30, 2015	May. 31, 2015
Public Utilities, General Disclosures [Line Items]
Energy optimization incentive requested for exceeding savings targets					$ 17
Electric Rate Case [Member]
Public Utilities, General Disclosures [Line Items]
Annual rate increase requested		$ 163
Rate of return on equity requested		10.70%
Annual rate increase self-implemented				$ 110
Electric Rate Case [Member] | 2016 and 2017 Planned Investments [Member]
Public Utilities, General Disclosures [Line Items]
Investment recovery mechanism requested		$ 163
Electric Rate Case [Member] | 2018 Planned Investments [Member]
Public Utilities, General Disclosures [Line Items]
Investment recovery mechanism requested		$ 78
Gas Rate Case [Member]
Public Utilities, General Disclosures [Line Items]
Annual rate increase requested			$ 88
Annual rate increase authorized	$ 45
Rate of return on equity authorized	10.30%

Regulatory Matters (Components

Regulatory Matters (Components of the Increase in Revenue for Electric Rate Increase) (Details) - Electric Rate Case [Member] - Consumers Energy Company [Member] $ in Millions	1 Months Ended
	Dec. 31, 2014USD ($)
Public Utilities, General Disclosures [Line Items]
Investment in rate base	$ 185
Addition of natural gas-fueled electric generation plant	35
Operating and maintenance costs	26
Cost of capital	21
Working capital	6
Cost-reduction initiatives	(80)
Gross margin	(30)
Annual rate increase requested	$ 163

Contingencies And Commitments34

Contingencies And Commitments (Contingencies And Commitments) (Details) $ in Millions	6 Months Ended
	Jun. 30, 2015USD ($)itemlawsuit	Dec. 31, 2014USD ($)
Loss Contingencies [Line Items]
Regulatory assets	$ 1,908	$ 1,956
Consumers Energy Company [Member]
Loss Contingencies [Line Items]
Regulatory assets	$ 1,908	$ 1,956
Bay Harbor [Member]
Loss Contingencies [Line Items]
Environmental remediation permit renewal term	5 years
Demand for payment by USEPA	$ 8
Cumulative environmental charge	246
Accrual for environmental loss contingencies	$ 60
Discounted projected costs rate	4.34%
Remaining undiscounted obligation amount	$ 77
Accrual for environmental loss contingencies, inflation rate	1.00%
CERCLA Liability [Member] | Consumers Energy Company [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 3
Remediation and other response activity costs, minimum	3
Remediation and other response activity costs. maximum	9
Manufactured Gas Plant [Member] | Consumers Energy Company [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 113
Discounted projected costs rate	2.57%
Remaining undiscounted obligation amount	$ 128
Number of former MGPs | item	23
Regulatory assets	$ 144
Authorized recovery, collection period	10 years
Accrual for environmental loss contingencies, inflation rate	2.50%
Electric Utility [Member] | NREPA [Member] | Consumers Energy Company [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	$ 5
Remediation and other response activity costs, minimum	5
Remediation and other response activity costs. maximum	7
Gas Utility [Member] | NREPA [Member] | Consumers Energy Company [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies	1
Remediation and other response activity costs. maximum	3
Equatorial Guinea Tax Claim [Member]
Loss Contingencies [Line Items]
Foreign government tax claim on sale	$ 142
Gas Index Price Reporting [Member]
Loss Contingencies [Line Items]
Number of lawsuits | lawsuit	5

Contingencies And Commitments35

Contingencies And Commitments (Expected Remediation Cost By Year) (Details) $ in Millions	Jun. 30, 2015USD ($)
Manufactured Gas Plant [Member] | Consumers Energy Company [Member]
Site Contingency [Line Items]
Undiscounted amount due within one year	$ 11
Undiscounted amount due within two year	12
Undiscounted amount due within third year	13
Undiscounted amount due within fourth year	11
Undiscounted amount due within five year	14
Bay Harbor [Member]
Site Contingency [Line Items]
Undiscounted amount due within one year	7
Undiscounted amount due within two year	6
Undiscounted amount due within third year	5
Undiscounted amount due within fourth year	5
Undiscounted amount due within five year	$ 5

Contingencies And Commitments36

Contingencies And Commitments (Guarantees) (Details) - Jun. 30, 2015 - USD ($) $ in Millions		Total
Consumers Energy Company [Member]
Guarantor Obligations [Line Items]
Guarantee Description		Indemnity obligations and other guarantees
Expiration Date		Various through August 2029
Maximum obligation		$ 30
Carrying Amount		$ 1
Guarantees [Member]
Guarantor Obligations [Line Items]
Guarantee Description		Guarantees
Expiration Date		Various through March 2021
Maximum obligation		$ 51
Indemnity Obligations From Asset Sales And Other Agreements [Member]
Guarantor Obligations [Line Items]
Guarantee Description		Indemnity obligations from asset sales   and other agreements
Expiration Date		Various through August 2029
Maximum obligation	[1]	$ 148
Carrying Amount		$ 7
[1]	The majority of this amount arises from stock and asset sale agreements under which CMS Energy or a subsidiary of CMS Energy, other than Consumers, indemnified the purchaser for losses resulting from various matters, including claims related to tax disputes, claims related to power purchase agreements, and defects in title to the assets or stock sold to the purchaser by CMS Energy subsidiaries. Except for items described elsewhere in this Note, CMS Energy believes the likelihood of material loss to be remote for the indemnity obligations not recorded as liabilities.

Financings And Capitalization37

Financings And Capitalization (Narrative) (Details) - USD ($) $ in Millions		1 Months Ended	6 Months Ended
		Sep. 30, 2014	Jun. 30, 2015
Financing And Capitalization [Line Items]
Limitation on payment of stock dividends			$ 3,800
Common stock dividends from Consumers			254
Aggregate sales price of an equity offering program			100
Consumers Energy Company [Member]
Financing And Capitalization [Line Items]
Unrestricted retained earnings			811
Consumers Energy Company [Member] | Commercial Paper [Member]
Financing And Capitalization [Line Items]
Short-term debt, authorized borrowings		$ 500
Short-term borrowings outstanding			0
Short Term Secured Borrowing Accounts Receivable Sales Program [Member] | Consumers Energy Company [Member]
Financing And Capitalization [Line Items]
Amount of accounts receivable eligible for transfer			250
Short-term borrowings outstanding			0
Revolving Credit Facilities May 27, 2020 [Member] | CMS Energy [Member]
Financing And Capitalization [Line Items]
Amount of Facility	[1]		550
Revolving Credit Facilities May 27, 2020 [Member] | Consumers Energy Company [Member]
Financing And Capitalization [Line Items]
Amount of Facility		$ 650	$ 650	[2]
[1]	During the six months ended June 30, 2015, CMS Energy's average borrowings totaled $61 million with a weighted-average interest rate of 1.43 percent. Obligations under this facility are secured by Consumers common stock.
[2]	Obligations under this facility are secured by FMBs of Consumers.

Financings And Capitalization38

Financings And Capitalization (Revolving Credit Facilities) (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2015		Sep. 30, 2014
Revolving Credit Facilities May 27, 2020 [Member] | CMS Energy [Member]
Line of Credit Facility [Line Items]
Expiration Date	[1]	May 27, 2020
Amount of Facility	[1]	$ 550
Amount Borrowed	[1]
Letters of Credit Outstanding	[1]	$ 3
Amount Available	[1]	547
Average borrowings		$ 61
Weighted average interest rate		1.43%
Revolving Credit Facilities May 27, 2020 [Member] | Consumers Energy Company [Member]
Line of Credit Facility [Line Items]
Expiration Date	[2]	May 27, 2020
Amount of Facility		$ 650	[2]	$ 650
Amount Borrowed	[2]
Letters of Credit Outstanding	[2]	$ 10
Amount Available	[2]	$ 640
Revolving Credit Facilities May 9, 2018 [Member] | Consumers Energy Company [Member]
Line of Credit Facility [Line Items]
Expiration Date	[2]	May 9, 2018
Amount of Facility	[2]	$ 30
Amount Borrowed	[2]
Letters of Credit Outstanding	[2]	$ 30
Amount Available	[2]
[1]	During the six months ended June 30, 2015, CMS Energy's average borrowings totaled $61 million with a weighted-average interest rate of 1.43 percent. Obligations under this facility are secured by Consumers common stock.
[2]	Obligations under this facility are secured by FMBs of Consumers.

Financings And Capitalization39

Financings And Capitalization (Issuance Of Common Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	Jul. 07, 2015	May. 31, 2015	Jul. 07, 2015
Subsequent Event [Line Items]
Number of Shares Issued		587,181
Average Price Per Share		$ 34.10
Proceeds		$ 20
Subsequent Event [Member]
Subsequent Event [Line Items]
Number of Shares Issued	301,429		888,610
Average Price Per Share	$ 33.10		$ 33.76
Proceeds	$ 10		$ 30

Fair Value Measurements (Assets

Fair Value Measurements (Assets And Liabilties Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	[1]	$ 291	$ 110
Restricted cash equivalents	[1]	40	38
Nonqualified deferred compensation plan assets	[1]	9	8
Commodity contracts	[1]	4	2
Total	[1]	496	289
Nonqualified deferred compensation plan liabilities	[1]	9	8
Commodity contracts	[1]	1	1
Total	[1]	10	9
Consumers Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	[1]	251	19
Restricted cash equivalents	[1]	40	38
Nonqualified deferred compensation plan assets	[1]	6	6
Commodity contracts	[1]	4	2
Total	[1]	436	196
Nonqualified deferred compensation plan liabilities	[1]	6	6
Commodity contracts	[1]	1	1
Total	[1]	7	7
DB SERP [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	[1]	2	4
DB SERP [Member] | Consumers Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	[1]	2	3
DB SERP [Member] | Mutual Fund [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale - Fair Value	[1]	150	127
DB SERP [Member] | Mutual Fund [Member] | Consumers Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale - Fair Value	[1]	107	90
CMS Energy Common Stock [Member] | Consumers Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Available for sale - Fair Value	[1]	$ 26	$ 38
[1]	All assets and liabilities were classified as Level 1 with the exception of some commodity contracts, which were classified as Level 2 or Level 3 and which were insignificant at June 30, 2015 and December 31, 2014.

Fair Value Measurements (Asse41

Fair Value Measurements (Assets And Liabilities Measured At Fair Value On A Recurring Basis Using Significant Level 3 Inputs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance at beginning of period	$ 1		$ 1	$ 4
Total gains (losses) offset through regulatory accounting	2	$ 1	3	(18)
Purchases				(1)
Settlements			(1)	16
Balance at end of period	3	1	3	1
Unrealized gains (losses) included in earnings relating to assets and liabilities still held at end of period	0	0	0	0
Consumers Energy Company [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Balance at beginning of period	1		1	4
Total gains (losses) offset through regulatory accounting	2	1	3	(18)
Purchases				(1)
Settlements			(1)	16
Balance at end of period	$ 3	$ 1	$ 3	$ 1

Financial Instruments (Narrativ

Financial Instruments (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jan. 31, 2015	Jun. 30, 2015	Dec. 31, 2014
Financial Instruments [Line Items]
Portion of long-term debt supported by third-party credit enhancements		$ 103	$ 103
Consumers Energy Company [Member]
Financial Instruments [Line Items]
Portion of long-term debt supported by third-party credit enhancements		103	$ 103
Gain on CMS Energy common stock	$ 9
DB SERP [Member]
Financial Instruments [Line Items]
Company contributions		25
DB SERP [Member] | Consumers Energy Company [Member]
Financial Instruments [Line Items]
Company contributions		$ 17

Financial Instruments (Schedule

Financial Instruments (Schedule Of Carrying Amounts And Fair Values Of Financial Instruments) (Details) - USD ($) $ in Millions		Jun. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current notes receivable		$ 114	$ 98
Current portion of long-term debt		498	519
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity - Fair Value		13	11
Long-term debt, Fair Value	[1]	8,538	8,535
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity - Fair Value		13	11
Long-term debt, Fair Value	[1]	9,090	9,285
Consumers Energy Company [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current portion of long-term debt		100	124
Consumers Energy Company [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	[2]	5,241	5,278
Consumers Energy Company [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	[2]	5,567	5,749
EnerBank [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Current notes receivable		113	138
EnerBank [Member] | Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, Fair Value	[3]	990	938
EnerBank [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, Fair Value	[3]	$ 1,052	$ 995
Fair Value, Inputs, Level 1 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity - Fair Value
Long-term debt, Fair Value	[1]
Fair Value, Inputs, Level 1 [Member] | Consumers Energy Company [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	[2]
Fair Value, Inputs, Level 1 [Member] | EnerBank [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, Fair Value	[3]
Fair Value, Inputs, Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Securities held to maturity - Fair Value		$ 13	$ 11
Long-term debt, Fair Value	[1]	8,088	8,252
Fair Value, Inputs, Level 2 [Member] | Consumers Energy Company [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	[2]	4,565	4,716
Fair Value, Inputs, Level 3 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	[1]	1,002	1,033
Fair Value, Inputs, Level 3 [Member] | Consumers Energy Company [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, Fair Value	[2]	1,002	1,033
Fair Value, Inputs, Level 3 [Member] | EnerBank [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes receivable, Fair Value	[3]	$ 1,052	$ 995
[1]	Includes current portion of long-term debt of $498 million at June 30, 2015 and $519 million at December 31, 2014.
[2]	Includes current portion of long-term debt of $100 million at June 30, 2015 and $124 million at December 31, 2014.
[3]	Includes current portion of notes receivable of $113 million at June 30, 2015 and $138 million at December 31, 2014.

Financial Instruments (Schedu44

Financial Instruments (Schedule Of Investment Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Debt Securities [Member]
Investment Securities [Line Items]
Held to maturity securities - Cost	$ 13	$ 11
Held to maturity securities - Unrealized Losses
Held to maturity securities - Fair Value	$ 13	$ 11
CMS Energy Common Stock [Member] | Consumers Energy Company [Member]
Investment Securities [Line Items]
Available for sale - Cost	4	5
Available for sale - Unrealized Gains	$ 22	$ 33
Available for sale - Unrealized Losses
Available for sale - Fair Value	$ 26	$ 38
DB SERP [Member] | Mutual Fund [Member]
Investment Securities [Line Items]
Available for sale - Cost	153	129
Available for sale - Unrealized Losses	3	2
Available for sale - Fair Value	150	127
DB SERP [Member] | Mutual Fund [Member] | Consumers Energy Company [Member]
Investment Securities [Line Items]
Available for sale - Cost	109	92
Available for sale - Unrealized Losses	2	2
Available for sale - Fair Value	$ 107	$ 90

Notes Receivable (Narrative) (D

Notes Receivable (Narrative) (Details) - EnerBank [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Sale of notes receivable	$ 48
Delinquent loans	5	$ 5
Loans modified as troubled debt restructurings	$ 1	$ 1

Notes Receivable (Schedule Of C

Notes Receivable (Schedule Of Current And Non-Current Notes Receivable) (Details) - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current notes receivable	$ 114	$ 98
Total notes receivable	991	939
EnerBank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current notes receivable	113	138
Noncurrent notes receivable	877	800
Receivables, Excluding Held For Sale [Member] | EnerBank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current notes receivable	113	97
Receivables Held For Sale [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current notes receivable		41
Other [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Current notes receivable	$ 1	$ 1

Retirement Benefits (Narrative)

Retirement Benefits (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended		6 Months Ended
	Feb. 28, 2015	Oct. 31, 2014	Jun. 30, 2015	Jun. 30, 2014
Defined Benefit Plan Disclosure [Line Items]
Postretirement benefits contributions			$ 33	$ 4
Consumers Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Postretirement benefits contributions			$ 31	$ 2
Consumers Energy Company [Member] | OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Postretirement benefits contributions	$ 29	$ 25

Retirement Benefits (Schedule O

Retirement Benefits (Schedule Of Net Benefit Costs) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 12	$ 10	$ 24	$ 20
Interest expense	26	25	51	50
Expected return on plan assets	(35)	(34)	(69)	(68)
Amortization of Net loss	22	14	45	29
Amortization of Prior service cost (credit)	1	1	1	1
Net periodic cost (credit)	26	16	52	32
Pension Plan [Member] | Consumers Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	12	10	24	20
Interest expense	24	24	49	48
Expected return on plan assets	(34)	(33)	(67)	(66)
Amortization of Net loss	22	14	44	28
Amortization of Prior service cost (credit)	1	1	1	1
Net periodic cost (credit)	25	16	51	31
OPEB [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	5	12	10
Interest expense	14	14	29	28
Expected return on plan assets	(22)	(22)	(45)	(44)
Amortization of Net loss	6	1	11	1
Amortization of Prior service cost (credit)	(11)	(11)	(21)	(21)
Net periodic cost (credit)	(7)	(13)	(14)	(26)
OPEB [Member] | Consumers Energy Company [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	6	5	12	10
Interest expense	14	14	28	27
Expected return on plan assets	(21)	(21)	(43)	(42)
Amortization of Net loss	5	1	11	2
Amortization of Prior service cost (credit)	(10)	(10)	(20)	(20)
Net periodic cost (credit)	$ (6)	$ (11)	$ (12)	$ (23)

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - Consumers Energy Company [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Income Tax Benefits [Line Items]
Reduction of income tax expense	$ 20	$ 23
Electric Utility [Member]
Income Tax Benefits [Line Items]
Income tax benefits, to be returned to customers	$ 209
Tax benefit, distribution to customers, term	5 years
Gas Utility [Member]
Income Tax Benefits [Line Items]
Income tax benefits, to be returned to customers	$ 260
Tax benefit, distribution to customers, term	12 years

Income Taxes (Details)

Income Taxes (Details)	6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
U.S. federal income tax rate	35.00%	35.00%
State and local income taxes, net of federal effect	4.80%	5.00%
Accelerated flow-through of regulatory tax benefits	(4.90%)	(5.40%)
Other, net	(1.30%)	(0.60%)
Effective tax rate	33.60%	34.00%
Consumers Energy Company [Member]
U.S. federal income tax rate	35.00%	35.00%
State and local income taxes, net of federal effect	4.80%	4.90%
Accelerated flow-through of regulatory tax benefits	(4.30%)	(4.50%)
Other, net	(1.50%)	(0.60%)
Effective tax rate	34.00%	34.80%

Earnings Per Share - CMS Ener51

Earnings Per Share - CMS Energy (Basic And Diluted EPS Computations) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share - CMS Energy [Abstract]
Income from continuing operations	$ 68	$ 84	$ 270	$ 288
Less income attributable to noncontrolling interest	1	1	1	1
Income from continuing operations available to common stockholders - basic and diluted	$ 67	$ 83	$ 269	$ 287
Weighted average shares - basic	275.4	268	275.1	267.1
Add dilutive contingently convertible securities		6		6.2
Add dilutive non-vested stock awards	0.8	0.6	0.8	0.6
Weighted average shares - diluted	276.2	274.6	275.9	273.9
Basic	$ 0.25	$ 0.31	$ 0.98	$ 1.07
Diluted	$ 0.25	$ 0.30	$ 0.98	$ 1.05

Reportable Segments (Details)

Reportable Segments (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
		Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Segment Reporting Information [Line Items]
Operating Revenue		$ 1,350	$ 1,468	$ 3,461	$ 3,991
Net Income Attributable to CMS Energy		67	83	269	287
Plant, property, and equipment, gross		18,217		18,217		$ 17,721
Total Assets		19,238		19,238		19,185
Consumers Energy Company [Member]
Segment Reporting Information [Line Items]
Operating Revenue		1,281	1,387	3,309	3,769
Net Income Available to Common Stockholders		83	108	298	329
Plant, property, and equipment, gross		18,074		18,074		17,580
Total Assets		17,867		17,867		17,847
Electric Utility [Member]
Segment Reporting Information [Line Items]
Operating Revenue		1,007	1,051	2,040	2,275
Net Income Attributable to CMS Energy		82	98	176	198
Plant, property, and equipment, gross	[1]	12,597		12,597		12,230
Total Assets	[1]	11,906		11,906		11,582
Electric Utility [Member] | Consumers Energy Company [Member]
Segment Reporting Information [Line Items]
Operating Revenue		1,007	1,051	2,040	2,275
Net Income Available to Common Stockholders		82	98	176	198
Plant, property, and equipment, gross	[1]	12,597		12,597		12,230
Total Assets	[1]	11,906		11,906		11,582
Gas Utility [Member]
Segment Reporting Information [Line Items]
Operating Revenue		274	335	1,269	1,493
Net Income Attributable to CMS Energy		1	9	122	130
Plant, property, and equipment, gross	[1]	5,462		5,462		5,335
Total Assets	[1]	5,309		5,309		5,391
Gas Utility [Member] | Consumers Energy Company [Member]
Segment Reporting Information [Line Items]
Operating Revenue		274	335	1,269	1,493
Net Income Available to Common Stockholders		1	9	122	130
Plant, property, and equipment, gross	[1]	5,462		5,462		5,335
Total Assets	[1]	5,309		5,309		5,391
Enterprises [Member]
Segment Reporting Information [Line Items]
Operating Revenue		45	62	105	184
Net Income Attributable to CMS Energy			2	7	4
Plant, property, and equipment, gross		118		118		115
Total Assets		267		267		231
Other [Member]
Segment Reporting Information [Line Items]
Operating Revenue		24	20	47	39
Net Income Attributable to CMS Energy		(16)	(26)	(36)	(45)
Plant, property, and equipment, gross		40		40		41
Total Assets		1,756		1,756		1,981
Other [Member] | Consumers Energy Company [Member]
Segment Reporting Information [Line Items]
Operating Revenue			1		1
Net Income Available to Common Stockholders			$ 1		$ 1
Plant, property, and equipment, gross		15		15		15
Total Assets		$ 652		$ 652		$ 874
[1]	Amounts include a portion of Consumers' other common assets attributable to both the electric and gas utility businesses.