Supplemental Disclosures of Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Supplemental disclosures of cash flow information:
Cash payments for income taxes, net	$ 15	$ 99	$ 80
Cash payments for interest	128	163	179
Supplemental disclosures of non-cash flow investing and financing activities:
Write off of unamortized debt issuance costs	(23)
Assets Acquired under capital leases		23
Non cash proceeds from reorganization of investments in associates (Note 6)			126
Issue of stock on acquisitions of subsidiaries			1
Issue of loan notes on acquisitions of noncontrolling interests			13
Issue of stock on acquisitions of noncontrolling interests			11
Deferred payments on acquisitions of subsidiaries	3		1
Deferred payments on acquisitions of noncontrolling interests	8	13	1
Acquisitions:
Fair Value of Assets Acquired	6	12	28
Less:
Liabilities assumed	(3)	(18)	(55)
Cash acquired	(3)		(12)
Net liabilities assumed, net of cash acquired		$ (6)	$ (39)