Consolidated Statements Of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating Revenue	$ 1,371	$ 1,350	$ 3,172	$ 3,461
Operating Expenses
Fuel for electric generation	97	134	222	301
Purchased and interchange power	365	341	711	690
Purchased power - related parties	21	17	43	40
Cost of gas sold	91	113	445	702
Maintenance and other operating expenses	276	312	569	595
Depreciation and amortization	176	169	414	391
General taxes	60	60	147	141
Total operating expenses	1,086	1,146	2,551	2,860
Operating Income	285	204	621	601
Other Income (Expense)
Interest income	2	1	3	2
Allowance for equity funds used during construction	3	2	6	4
Income from equity method investees	3	1	7	5
Other income	2	3	5	6
Other expense	(4)	(4)	(7)	(8)
Total other income	6	3	14	9
Interest Charges
Interest on long-term debt	103	97	203	193
Other interest expense	7	7	14	13
Allowance for borrowed funds used during construction	(2)	(1)	(3)	(2)
Total interest charges	108	103	214	204
Income Before Income Taxes	183	104	421	406
Income Tax Expense	58	36	132	136
Net Income	125	68	289	270
Income Attributable to Noncontrolling Interests	1	1	1	1
Net Income Available to Common Stockholders	$ 124	$ 67	$ 288	$ 269
Basic Earnings Per Average Common Share	$ 0.45	$ 0.25	$ 1.04	$ 0.98
Diluted Earnings Per Average Common Share	0.45	0.25	1.04	0.98
Dividends declared per common share	$ 0.31	$ 0.29	$ 0.62	$ 0.58
Consumers Energy Company [Member]
Operating Revenue	$ 1,293	$ 1,281	$ 3,016	$ 3,309
Operating Expenses
Fuel for electric generation	73	110	172	243
Purchased and interchange power	360	337	703	683
Purchased power - related parties	21	17	43	40
Cost of gas sold	87	108	438	691
Maintenance and other operating expenses	254	291	523	556
Depreciation and amortization	173	168	410	388
General taxes	61	58	146	137
Total operating expenses	1,029	1,089	2,435	2,738
Operating Income	264	192	581	571
Other Income (Expense)
Interest income	1	1	2	2
Interest and dividend income - related parties	1		1
Allowance for equity funds used during construction	3	2	6	4
Other income	2	3	5	15
Other expense	(4)	(4)	(7)	(8)
Total other income	3	2	7	13
Interest Charges
Interest on long-term debt	65	63	130	126
Other interest expense	3	4	6	7
Allowance for borrowed funds used during construction	(2)	(1)	(3)	(2)
Total interest charges	66	66	133	131
Income Before Income Taxes	201	128	455	453
Income Tax Expense	69	44	151	154
Net Income	132	84	304	299
Preferred Stock Dividends	1	1	1	1
Net Income Available to Common Stockholders	$ 131	$ 83	$ 303	$ 298