Financial Instruments (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended			6 Months Ended	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2009	Dec. 31, 2011 Interest Rate Swaps [Member]	Jun. 30, 2011 5.75% Notes due June 2011 with an effective interest rate of 5.86% [Member]	Dec. 31, 2011 5.75% Notes due June 2011 with an effective interest rate of 5.86% [Member]
Financial Instruments (Textual) [Abstract]
Repayment of long-term debt	$ 813	$ 525		$ 250	$ 250
Interest rate on notes	6.50%			5.75%	5.75%
Gain from the termination of interest rate swap agreements			$ 25
Number of countries company operates in	more than 80 countries