Consolidated Debt Table (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2009
Line of Credit Facility, Amount Outstanding	$ 357	$ 619
Long-term Debt	2,015	1,486
Total Long Term Debt, Senior Notes and Debentures	1,323	867
Long-term Debt, Current Maturities	3	32
Long-term Debt, Excluding Current Maturities	2,012	1,454
Project Debt	317	680
Other Project Debt	23	26
Current portion of project debt	(80)	(147)
Project Debt Noncurrent	237	533
Debt, Total	2,332	2,166
Debt, Current	(83)	(179)
Debt, Noncurrent	2,249	1,987
Americas [Member]
Project Debt	294	654
Revolving Credit Facility [Member]
Line of Credit Facility, Amount Outstanding	60	0
Term Loan [Member]
Line of Credit Facility, Amount Outstanding	298	619
Debt Instrument, Unamortized Discount	1	0
Long-term Debt, Gross	297	619
Senior Notes 7.25 Percent Due 2020 [Member]
Long-term Debt	400	400
Senior Notes 6.375 Percent Due 2022 [Member]
Long-term Debt, Gross	400
Long-term Debt	400	0
3.25% Cash Convertible Senior Notes due 2014 [Member]
Debt Instrument, Unamortized Discount	42	67
Long-term Debt, Gross			336
Long-term Debt	523	442
Debt Instrument, Face Amount	460	460	460
Derivative Liability, Fair Value, Gross Liability	105	49
1.00% Senior Convertible Debentures due 2027 [Member]
Long-term Debt	0	25
Tax Exempt Bonds due 2024 to 2042 [Member]
Long-term Debt	335	0
Americas Project Debt Related To Service Fee Structures [Member]
Project Debt	223	291
Americas Project Debt Related To Tip Fee Structures [Member]
Project Debt	68	355
Debt Instrument, Unamortized Premium	$ 3	$ 8