Retirement Benefits and Trusteed Assets (Tables)

9 Months Ended

Sep. 30, 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 Benefits						Other Postretirement Benefits
	2013			2012			2013			2012
Three Months Ended September 30	(In millions)
Service cost	$	22		$	20		$	9		$	15
Interest cost	49			51			21			29
Expected return on plan assets	(67		)	(61		)	(28		)	(23		)
Amortization of:
Net actuarial loss	55			48			16			21
Prior service credit	—			—			(36		)	(6		)
Net periodic benefit cost (credit)	$	59		$	58		$	(18	)	$	36

	Pension Benefits						Other Postretirement Benefits
	2013			2012			2013			2012
Nine Months Ended September 30	(In millions)
Service cost	$	71		$	61		$	37		$	51
Interest cost	144			153			66			90
Expected return on plan assets	(200		)	(183		)	(82		)	(69		)
Amortization of:
Net actuarial loss	156			133			48			60
Prior service credit	—			—			(95		)	(20		)
Net transition liability	—			—			—			1
Settlements	—			2			—			—
Net periodic benefit cost (credit)	$	171		$	166		$	(26	)	$	113