Subsequent Events Subsequent Events (Details) (U.S. Pension Benefits [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended	1 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jul. 31, 2012 Change in Legislation [Member]	Jul. 06, 2012 Change in Legislation [Member]
Subsequent Event [Line Items]
Defined Benefit Plan Estimated Total Employer Contributions in Current Fiscal Year				$ 85
Defined Benefit Plan, Contributions by Employer	$ 27	$ 27	$ 15