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Commitments and Contingencies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
1 Months Ended 11 Months Ended 12 Months Ended
Jan. 31, 2011
Dec. 31, 2011
Dec. 31, 2012
Dec. 31, 2010
Jun. 30, 2013
Oct. 20, 2012
Short-term Debt [Line Items]            
Purchase commitments obligation 2013     $ 344   $ 67  
Purchase commitments obligation 2014     318   94  
Purchase commitments obligation 2015     257   36  
Purchase commitments obligation 2016     7   23  
Purchase commitments obligation 2017     7   23  
Purchase commitments obligation thereafter     58   104  
Outstanding letters of credit     55   45  
Office of State Revenue Assessment           5
Accrued stamp duty     3     3
Penalty tax           2
Trades and other payables     3      
Minimum rental commitments due 2013     29      
Minimum rental commitments due 2014     27      
Minimum rental commitments due 2015     25      
Minimum rental commitments due 2016     23      
Minimum rental commitments due 2017     23      
Minimum rental commitments due thereafter     157      
Total rental expense relating to operating lease 1 12 8 15    
Disputed claims received     11      
Capital cost incurred due to legal dispute agreement     1      
UBS Revolver [Member]
           
Short-term Debt [Line Items]            
Outstanding letters of credit     29   25  
ABSA Revolver [Member]
           
Short-term Debt [Line Items]            
Outstanding letters of credit         $ 17