Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2011

Employee Benefit Plans [Abstract]

Net periodic benefit cost related to retirement and restoration plans

Net periodic benefit cost related to the retirement and restoration plans was as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2011			2010			2011			2010
(millions)
Service Cost	$	3		$	4		$	10		$	11
Interest Cost		3			3			10			10
Expected Return on Plan Assets		(4	)		(3	)		(11	)		(10	)
Other		2			1			5			4
Net Periodic Benefit Cost	$	4		$	5		$	14		$	15