Employee Benefit Plans (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012
U.S. Pension and Postretirement Plans [Member]
Employer's expected minimum contribution	$ 50
Employer's expected maximum contribution	55
Employer contribution	2
Estimated future employer contributions in next fiscal year minimum remaining	48
Estimated future employer contributions in next fiscal year maximum remaining	53
International Pension and Postretirement Plans [Member]
Employer's expected minimum contribution	40
Employer's expected maximum contribution	45
Employer contribution	5
Estimated future employer contributions in next fiscal year minimum remaining	35
Estimated future employer contributions in next fiscal year maximum remaining	$ 40