Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2013

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of Regulatory Assets [Table Text Block]

The following are balances and a brief description of the regulatory assets and liabilities at December 31:

	2013			2012
	(In millions)
Assets
Recoverable pension and other postretirement costs:
Pension	$	1,660		$	2,420
Other postretirement costs	—			426
Asset retirement obligation	394			424
Recoverable Michigan income taxes	286			304
Recoverable income taxes related to securitized regulatory assets	126			226
Cost to achieve Performance Excellence Process	75			96
Other recoverable income taxes	71			76
Unamortized loss on reacquired debt	63			63
Deferred environmental costs	59			58
Enterprise Business Systems costs	13			16
Recoverable revenue decoupling	9			28
Choice incentive mechanism	3			66
Accrued PSCR/GCR revenue	—			87
Recoverable restoration expense	—			49
Other	104			78
	2,863			4,417
Less amount included in current assets	(26		)	(182		)
	$	2,837		$	4,235
Securitized regulatory assets	$	231		$	413

Schedule of Regulatory Liabilities [Table Text Block]

	2013			2012
	(In millions)
Liabilities
Asset removal costs	$	351		$	439
Renewable energy	277			230
Refundable revenue decoupling/deferred gain	127			127
Negative pension offset	84			105
Over recovery of Securitization	72			54
Refundable other postretirement costs	72			—
Accrued PSCR/GCR	65			16
Refundable income taxes	45			56
Energy optimization	31			34
Fermi 2 refueling outage	26			12
Refundable uncollectible expense	12			37
Other	2			10
	$	1,164		$	1,120
Less amount included current liabilities	(302		)	(89		)
	$	862		$	1,031