Retirement Benefits and Trusteed Assets (Tables)

6 Months Ended

Jun. 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						Other Postretirement
	Benefits						Benefits
	2013			2012			2013			2012
Three Months Ended June 30	(In millions)
Service cost	$	25		$	20		$	12		$	18
Interest cost	47			51			21			31
Expected return on plan assets	(66		)	(61		)	(27		)	(23		)
Amortization of:
Net actuarial loss	50			43			15			20
Prior service credit	—			—			(36		)	(7		)
Net periodic benefit cost	$	56		$	53		$	(15	)	$	39

	Pension						Other Postretirement
	Benefits						Benefits
	2013			2012			2013			2012
Six Months Ended June 30	(In millions)
Service cost	$	49		$	41		$	28		$	36
Interest cost	95			102			45			61
Expected return on plan assets	(133		)	(122		)	(54		)	(46		)
Amortization of:
Net actuarial loss	101			85			32			39
Prior service credit	—			—			(59		)	(14		)
Net transition liability	—			—			—			1
Settlements	—			2			—			—
Net periodic benefit cost	$	112		$	108		$	(8	)	$	77