Pension And Postretirement Benefits (Narrative) (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
Pension And Postretirement Benefits
Combined net pension and postretirement cost decrease	$ 50		$ 136
Net supplemental retirement pension benefits costs	31	35	94	106
Net supplemental retirement pension benefits costs - interest cost	29	31	87	94
Estimated Future Pension Contribution	$ 9,500		$ 9,500
Estimated Future Pension Contribution Description			Estimated contribution of a preferred equity interest in our Mobility business to our pension plans in 2013. This contribution is pending approval from the U.S. Department of Labor.
Application Filing Date			2012-10
Expected Pension Contribution Year			2013