Retirement Benefits and Trusteed Assets (Tables)

6 Months Ended

Jun. 30, 2014

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
	2014			2013			2014			2013
Three Months Ended June 30	(In millions)
Service cost	$	22		$	25		$	9		$	12
Interest cost	52			47			22			21
Expected return on plan assets	(68		)	(66		)	(30		)	(27		)
Amortization of:
Net actuarial loss	38			50			6			15
Prior service credit	—			—			(36		)	(36		)
Net periodic benefit cost (credit)	$	44		$	56		$	(29	)	$	(15	)

	Pension Benefits						Other Postretirement Benefits
	2014			2013			2014			2013
Six Months Ended June 30	(In millions)
Service cost	$	43		$	49		$	18		$	28
Interest cost	105			95			45			45
Expected return on plan assets	(136		)	(133		)	(61		)	(54		)
Amortization of:
Net actuarial loss	76			101			11			32
Prior service credit	—			—			(72		)	(59		)
Net periodic benefit cost (credit)	$	88		$	112		$	(59	)	$	(8	)