Retirement Benefits and Trusteed Assets (Tables)

9 Months Ended

Sep. 30, 2011

Defined Contribution Pension and Other Postretirement Plans Disclosure [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:

							Other Postretirement
	Pension Benefits						Benefits
(in Millions)	2011			2010			2011			2010
Three Months Ended September 30
Service cost	$	15		$	16		$	14		$	15
Interest cost	51			51			28			31
Expected return on plan assets	(62		)	(65		)	(24		)	(18		)
Amortization of:
Net actuarial loss	41			25			12			13
Prior service cost (credit)	—			1			(7		)	(1		)
Net transition liability	—			—			1			1
Special termination benefits	—			—			—			—
Net periodic benefit cost	$	45		$	28		$	24		$	41

							Other Postretirement
	Pension Benefits						Benefits
(in Millions)	2011			2010			2011			2010
Nine Months Ended September 30
Service cost	$	52		$	48		$	48		$	46
Interest cost	152			152			90			94
Expected return on plan assets	(185		)	(194		)	(71		)	(56		)
Amortization of:
Net actuarial loss	107			75			42			40
Prior service cost (credit)	2			3			(20		)	(3		)
Net transition liability	—			—			2			2
Special termination benefits	2						—			—
Net periodic benefit cost	$	130		$	84		$	91		$	123