Pension And Post-Retirement Benefits (Components Of The Net Periodic Benefit Costs) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
U.S. Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 3	$ 2	$ 7	$ 6
Interest cost	1	2	5	6
Expected return on plan assets	(3)	(3)	(8)	(8)
Amortization	2	1	4	3
Net periodic benefit cost	3	2	8	7
Pension Plans, International [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	2	2	6	6
Interest cost	2	1	7	6
Expected return on plan assets	(2)	(2)	(7)	(7)
Amortization	1	1	3	2
Net periodic benefit cost	3	2	9	7
Post-Retirement Medical Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Service cost	0	0	1	1
Interest cost	1	1	2	2
Expected return on plan assets	0	0	0	0
Amortization	0	0	(1)	(1)
Net periodic benefit cost	$ 1	$ 1	$ 2	$ 2