Retirement Benefits and Trusteed Assets

6 Months Ended

Jun. 30, 2012

Defined Benefit Plan, Assets for Plan Benefits [Abstract]

Pension and Other Postretirement Benefits Disclosure [Text Block]

RETIREMENT BENEFITS AND TRUSTEED ASSETS

The following table details the components of net periodic benefit costs for pension benefits and other postretirement benefits (in millions):

	Pension Benefits						Other Postretirement Benefits
	2012			2011			2012			2011
Three Months Ended June 30
Service cost	$	20		$	18		$	18		$	17
Interest cost	51			50			31			31
Expected return on plan assets	(61		)	(61		)	(23		)	(23		)
Amortization of:
Net actuarial loss	43			33			20			15
Prior service cost (credit)	—			1			(7		)	(6		)
Settlements	—			2			—			—
Net periodic benefit cost	$	53		$	43		$	39		$	34

	Pension Benefits						Other Postretirement Benefits
	2012			2011			2012			2011
Six Months Ended June 30
Service cost	$	41		$	37		$	36		$	34
Interest cost	102			101			61			62
Expected return on plan assets	(122		)	(123		)	(46		)	(47		)
Amortization of:
Net actuarial loss	85			66			39			30
Prior service cost (credit)	—			2			(14		)	(13		)
Net transition liability	—			—			1			1
Settlements	2			2			—			—
Net periodic benefit cost	$	108		$	85		$	77		$	67

Pension and Other Postretirement Contributions

The Company contributed $80 million of DTE Energy common stock to its pension plans in the second quarter of 2012, consisting of approximately 1.3 million shares valued at an average price of $59.94 per share. At the discretion of management, and depending upon financial market conditions, the Company may make up to an additional $140 million contribution to its pension plans in 2012.

In January 2012, the Company contributed $140 million to its other postretirement benefit plans. At the discretion of management, the Company may make up to an additional $120 million contribution to its other postretirement benefit plans in 2012.