Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2011

Benefit Plans [Abstract]

Components Of Net Periodic Benefit Cost

	Pension Benefits
	Three Months Ended September 30,						Nine Months Ended September 30,
	2011			2010			2011			2010
(In millions)
Service cost	$	6		$	7		$	18		$	20
Interest cost		41			42			123			125
Expected return on plan assets		(47	)		(44	)		(141	)		(132	)
Amortization of unrecognized net loss		8			7			22			21
Net periodic benefit cost	$	8		$	12		$	22		$	34

	Other Postretirement Benefits
	Three Months Ended September 30,						Nine Months Ended September 30,
	2011			2010			2011			2010
(In millions)
Service cost	$	1		$	1		$	1		$	2
Interest cost		1			3			5			9
Expected return on plan assets					(1	)		(2	)		(3	)
Amortization of unrecognized net loss		1						1			2
Amortization of unrecognized prior service benefit		(7	)		(6	)		(20	)		(18	)
Regulatory asset decrease		1			1			4			4
Net periodic benefit cost	$	(3	)	$	(2	)	$	(11	)	$	(4	)