Consolidated Statements Of Income (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Operating Revenue	$ 1,468	$ 1,406	$ 3,991	$ 3,385
Operating Expenses
Fuel for electric generation	154	147	373	301
Purchased and interchange power	359	347	857	680
Purchased power - related parties	22	23	46	46
Cost of gas sold	187	166	1,021	773
Maintenance and other operating expenses	304	304	570	586
Depreciation and amortization	151	137	350	318
General taxes	56	50	131	120
Total operating expenses	1,233	1,174	3,348	2,824
Operating Income	235	232	643	561
Other Income (Expense)
Interest income	1	2	1	2
Allowance for equity funds used during construction	2	1	4	4
Income from equity method investees	3	3	7	8
Other income	3	2	6	5
Other expense	(16)	(3)	(23)	(6)
Total other income (expense)	(7)	5	(5)	13
Interest Charges
Interest on long-term debt	99	99	196	193
Other interest expense	3	4	8	9
Allowance for borrowed funds used during construction	(1)	(1)	(2)	(2)
Total interest charges	101	102	202	200
Income Before Income Taxes	127	135	436	374
Income Tax Expense	43	54	148	149
Net Income	84	81	288	225
Income Attributable to Noncontrolling Interests	1	1	1	1
Net Income Available to Common Stockholders	83	80	287	224
Basic Earnings Per Average Common Share	$ 0.31	$ 0.30	$ 1.07	$ 0.85
Diluted Earnings Per Average Common Share	$ 0.30	$ 0.29	$ 1.05	$ 0.83
Dividends Declared Per Common Share	$ 0.27	$ 0.255	$ 0.54	$ 0.51
Consumers Energy Company [Member]
Operating Revenue	1,387	1,342	3,769	3,261
Operating Expenses
Fuel for electric generation	132	125	318	258
Purchased and interchange power	348	340	832	669
Purchased power - related parties	22	23	46	46
Cost of gas sold	167	154	935	754
Maintenance and other operating expenses	288	289	538	555
Depreciation and amortization	149	136	346	316
General taxes	54	48	128	117
Total operating expenses	1,160	1,115	3,143	2,715
Operating Income	227	227	626	546
Other Income (Expense)
Interest income	1	2	1	2
Allowance for equity funds used during construction	2	1	4	4
Other income	3	2	6	9
Other expense	(4)	(3)	(10)	(6)
Total other income (expense)	2	2	1	9
Interest Charges
Interest on long-term debt	59	60	118	119
Other interest expense	2	3	5	6
Allowance for borrowed funds used during construction	(1)	(1)	(2)	(2)
Total interest charges	60	62	121	123
Income Before Income Taxes	169	167	506	432
Income Tax Expense	60	67	176	170
Net Income	109	100	330	262
Preferred Stock Dividends and Distribution	1	1	1	1
Net Income Available to Common Stockholders	$ 108	$ 99	$ 329	$ 261