Pension Plans And Other Postretirement Benefits (Components Of Net Periodic Benefit Cost) (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Pension Benefits [Member]
Service costs for benefits earned	$ 1	$ 0	$ 2	$ 1
Interest costs on benefit obligation	12	11	24	23
Assumed return on plan assets	(13)	(12)	(26)	(25)
Amortization of net actuarial gain/loss	3	3	6	5
Settlement Charges	1	0	1	1
Total	4	2	7	5
Healthcare And Other Benefits [Member]
Service costs for benefits earned	1	1	2	2
Interest costs on benefit obligation	2	3	4	5
Assumed return on plan assets	(1)	(2)	(3)	(3)
Amortization of net actuarial gain/loss	(2)	(2)	(4)	(3)
Total	$ 0	$ 0	$ (1)	$ 1