Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Operating Revenue	$ 2,111	$ 2,523
Operating Expenses
Fuel for electric generation	167	219
Purchased and interchange power	349	498
Purchased power - related parties	23	24
Cost of gas sold	589	834
Maintenance and other operating expenses	283	266
Depreciation and amortization	222	199
General taxes	81	75
Total operating expenses	1,714	2,115
Operating Income	397	408
Other Income (Expense)
Interest income	1
Allowance for equity funds used during construction	2	2
Income from equity method investees	4	4
Other income	3	3
Other expense	(4)	(7)
Total other income (expense)	6	2
Interest Charges
Interest on long-term debt	96	97
Other interest expense	6	5
Allowance for borrowed funds used during construction	(1)	(1)
Total interest charges	101	101
Income Before Income Taxes	302	309
Income Tax Expense	100	105
Net Income	202	204
Basic Earnings Per Average Common Share	$ 0.73	$ 0.77
Diluted Earnings Per Average Common Share	$ 0.73	$ 0.75
Dividends declared per common share	$ 0.29	$ 0.27
Consumers Energy Company [Member]
Operating Revenue	2,028	2,382
Operating Expenses
Fuel for electric generation	133	186
Purchased and interchange power	346	484
Purchased power - related parties	23	24
Cost of gas sold	583	768
Maintenance and other operating expenses	265	250
Depreciation and amortization	220	197
General taxes	79	74
Total operating expenses	1,649	1,983
Operating Income	379	399
Other Income (Expense)
Interest income	1
Allowance for equity funds used during construction	2	2
Other income	12	3
Other expense	(4)	(6)
Total other income (expense)	11	(1)
Interest Charges
Interest on long-term debt	63	59
Other interest expense	3	3
Allowance for borrowed funds used during construction	(1)	(1)
Total interest charges	65	61
Income Before Income Taxes	325	337
Income Tax Expense	110	116
Net Income	$ 215	$ 221