Registration of securities issued in business combination transactions

ASSET RETIREMENT OBLIGATIONS (Details)

v2.4.0.6
ASSET RETIREMENT OBLIGATIONS (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Changes to asset retirement obligation liabilities    
Asset retirement obligation at beginning of year $ 24 $ 21
Accretion expense 2 1
Liabilities incurred   1
Liabilities assumed in connection with consolidation of a variable interest entity 2  
Liabilities settled (1)  
Foreign currency effect on reserve balance (1) 1
Asset retirement obligation at end of year $ 26 $ 24