Retirement Benefits and Trusteed Assets (Tables)

3 Months Ended

Mar. 31, 2012

Retirement Benefits and Trusted Assets [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:

							Other Postretirement
	Pension Benefits						Benefits
(In millions)	2012			2011			2012			2011
Three Months Ended March 31
Service cost	$	21		$	19		$	18		$	17
Interest cost	51			51			30			31
Expected return on plan assets	(61		)	(62		)	(23		)	(24		)
Amortization of:
Net actuarial loss	42			33			19			15
Prior service cost (credit)	—			1			(7		)	(7		)
Net transition liability	—			—			1			1
Settlements	2			—			—			—
Net periodic benefit cost	$	55		$	42		$	38		$	33