Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2012

Benefit Plans [Abstract]

Schedule Of Components Of Net Periodic Pension Cost

	For the Three Months Ended March 31,
	2012			2011
	(in millions)
Service cost	$	20		$	19
Interest cost		86			87
Expected return on plan assets		(111	)		(106	)
Amortization:
Net loss		56			43
Prior service cost		3			4
Net periodic pension cost	$	54		$	47

Postretirement Health Care Costs

	For the Three Months Ended March 31,
	2012			2011
	(in millions)
Service cost	$	5		$	9
Interest cost		30			34
Amortization:
Net loss		12			9
Prior service credit		(11	)		(5	)
Curtailment gain		(26	)
Net postretirement health care costs	$	10		$	47