Retirement Benefits and Trusteed Assets (Tables)

3 Months Ended

Mar. 31, 2013

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Schedule of Costs of Retirement Plans [Table Text Block]

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

	Pension						Other Postretirement
	Benefits						Benefits
	2013			2012			2013			2012
Three Months Ended March 31	(In millions)
Service cost	$	24		$	21		$	16		$	18
Interest cost	48			51			24			30
Expected return on plan assets	(67		)	(61		)	(27		)	(23		)
Amortization of:
Net actuarial loss	51			42			17			19
Prior service credit	—			—			(23		)	(7		)
Net transition liability	—			—			—			1
Settlements	—			2			—			—
Net periodic benefit cost	$	56		$	55		$	7		$	38