Other Income and Other Expense (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Regulatory return on capital expenditures		$ 1
Return on stranded costs		1	3
Fee income	7	7	8
All other	3	2	5
Total other income	10	11	16
Loss on reacquired and extinguished debt	(4)		(1)
Donations	(4)	(11)	(11)
Civic and political expenditures	(5)	(17)	(3)
All other	(7)	(5)	(7)
Total other expense	(20)	(33)	(22)
Consumers Energy Company [Member]
Regulatory return on capital expenditures		1
Gain on investment	4	5	4
Return on stranded costs		1	3
Fee income	7	7	8
All other	3	2	4
Total other income	14	16	19
Donations	(4)	(11)	(11)
Civic and political expenditures	(5)	(17)	(3)
All other	(7)	(5)	(6)
Total other expense	$ (16)	$ (33)	$ (20)