Retirement Benefits and Trusteed Assets Retirement Benefits and Trusted Assets (Tables)

3 Months Ended

Mar. 31, 2013

Defined Benefit Plan, Assets for Plan Benefits [Abstract]

Schedule of Defined Benefit Plans Disclosures [Table Text Block]

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

	Pension Benefits						Other Postretirement Benefits
	2013			2012			2013			2012
Three Months Ended March 31	(In millions)
Service cost	$	19		$	16		$	12		$	13
Interest cost	36			39			18			23
Expected return on plan assets	(46		)	(41		)	(18		)	(15		)
Amortization of:
Net actuarial loss	36			30			12			14
Prior service cost (credit)	—			—			(17		)	(4		)
Net transition liability	—			—			—			1
Settlements	—			2			—			—
Net periodic benefit cost	$	45		$	46		$	7		$	32