Retirement Benefits and Trusteed Assets (Tables)

9 Months Ended

Sep. 30, 2012

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 (in millions):

	Pension Benefits						Other Postretirement Benefits
	2012			2011			2012			2011
Three Months Ended September 30
Service cost	$	20		$	15		$	15		$	14
Interest cost	51			51			29			28
Expected return on plan assets	(61		)	(62		)	(23		)	(24		)
Amortization of:
Net actuarial loss	48			41			21			12
Prior service cost (credit)	—			—			(6		)	(7		)
Net transition liability	—			—			—			1
Net periodic benefit cost	$	58		$	45		$	36		$	24

	Pension Benefits						Other Postretirement Benefits
	2012			2011			2012			2011
Nine Months Ended September 30
Service cost	$	61		$	52		$	51		$	48
Interest cost	153			152			90			90
Expected return on plan assets	(183		)	(185		)	(69		)	(71		)
Amortization of:
Net actuarial loss	133			107			60			42
Prior service cost (credit)	—			2			(20		)	(20		)
Net transition liability	—			—			1			2
Settlements	2			2			—			—
Net periodic benefit cost	$	166		$	130		$	113		$	91