Retirement Benefits and Trusteed Assets Retirement Benefits and Trusted Assets (Tables)

6 Months Ended

Jun. 30, 2013

Defined Benefit Plan, Assets for Plan Benefits [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:

	Pension Benefits						Other Postretirement Benefits
	2013			2012			2013			2012
Three Months Ended June 30	(In millions)
Service cost	$	19		$	17		$	9		$	14
Interest cost	37			39			16			23
Expected return on plan assets	(47		)	(42		)	(19		)	(16		)
Amortization of:
Net actuarial loss	36			30			12			14
Prior service credit	—			—			(28		)	(4		)
Net periodic benefit cost	$	45		$	44		$	(10	)	$	31

	Pension Benefits						Other Postretirement Benefits
	2013			2012			2013			2012
Six Months Ended June 30	(In millions)
Service cost	$	38		$	33		$	21		$	27
Interest cost	73			78			34			46
Expected return on plan assets	(93		)	(83		)	(37		)	(31		)
Amortization of:
Net actuarial loss	72			60			24			28
Prior service credit	—			—			(45		)	(8		)
Net transition liability	—			—			—			1
Settlements	—			2			—			—
Net periodic benefit cost	$	90		$	90		$	(3	)	$	63