Employee Benefit Plans (Narrative) (Details) (United States Postretirement Benefit Plans of US Entity, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Other Costs	$ 6	$ 0	$ 110	$ 0
Special Termination Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Other Costs			$ 110