Regulatory Matters (Tables)

12 Months Ended

Dec. 31, 2014

Regulatory Assets and Liabilities Disclosure [Abstract]

Schedule of Regulatory Assets

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

	2014			2013
	(In millions)
Assets
Recoverable pension and other postretirement costs:
Pension	$	1,743		$	1,257
Other postretirement costs	191			—
Asset retirement obligation	448			394
Recoverable Michigan income taxes	220			237
Other recoverable income taxes	66			71
Cost to achieve Performance Excellence Process	46			64
Unamortized loss on reacquired debt	44			38
Accrued PSCR revenue	34			—
Recoverable income taxes related to securitized regulatory assets	19			126
Removal costs asset	15			—
Transitional Reconciliation Mechanism	14			—
Other	119			101
	2,959			2,288
Less amount included in current assets	(46		)	(13		)
	$	2,913		$	2,275
Securitized regulatory assets	$	34		$	231

Schedule of Regulatory Liabilities

	2014			2013
	(In millions)
Liabilities
Renewable energy	$	227		$	277
Over recovery of Securitization	71			72
Refundable revenue decoupling / deferred gain	63			127
Fermi 2 refueling outage	16			26
Energy optimization	14			25
Accrued PSCR refund	—			53
Refundable other postretirement costs	—			48
Removal costs liability	—			33
Other	4			3
	395			664
Less amount included in current liabilities	(150		)	(278		)
	$	245		$	386