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	$	1,257		$	1,815
Other postretirement costs	—			316
Asset retirement obligation	394			424
Recoverable Michigan income taxes	237			253
Recoverable income taxes related to securitized regulatory assets	126			226
Other recoverable income taxes	71			76
Cost to achieve Performance Excellence Process	64			82
Unamortized loss on reacquired debt	38			37
Enterprise Business Systems costs	13			16
Choice incentive mechanism	3			66
Accrued PSCR revenue	—			87
Recoverable restoration expense	—			49
Other	85			63
	2,288			3,510
Less amount included in current assets	(13		)	(162		)
	$	2,275		$	3,348
Securitized regulatory assets	$	231		$	413

Schedule of Regulatory Liabilities [Table Text Block]

	2013			2012
	(In millions)
Liabilities
Renewable energy	$	277		$	230
Refundable revenue decoupling / deferred gain	127			127
Over recovery of Securitization	72			54
Accrued PSCR refund	53			—
Refundable other postretirement costs	48			—
Asset removal costs	33			81
Fermi 2 refueling outage	26			12
Energy optimization	25			26
Refundable uncollectible expense	—			10
Other	3			9
	664			549
Less amount included in current liabilities	(278		)	(66		)
	$	386		$	483