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Declaration of Dividends (Details)
 6 Months Ended 12 Months Ended 6 Months Ended 12 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2012
Common stock [Member]
Final Dividend Prior Year [Member]
Dec. 31, 2011
Common stock [Member]
Final Dividend Prior Year [Member]
USD ($)
Dec. 31, 2011
Common stock [Member]
Final Dividend Prior Year [Member]
ZAR
Jun. 30, 2012
Common stock [Member]
Interim Dividend One Current Year [Member]
USD ($)
Jun. 30, 2012
Common stock [Member]
Interim Dividend One Current Year [Member]
ZAR
Jun. 30, 2012
Common stock [Member]
Interim Dividend Two Current Year [Member]
USD ($)
Jun. 30, 2012
Common stock [Member]
Interim Dividend Two Current Year [Member]
ZAR
Jun. 30, 2012
Common stock [Member]
C D Is [Member]
Jun. 30, 2012
Common stock [Member]
C D Is [Member]
Final Dividend Prior Year [Member]
Jun. 30, 2012
Common stock [Member]
C D Is [Member]
Interim Dividend One Current Year [Member]
Jun. 30, 2012
Common stock [Member]
C D Is [Member]
Interim Dividend Two Current Year [Member]
Jun. 30, 2012
Common stock [Member]
G H Ds [Member]
Jun. 30, 2012
Common stock [Member]
G H Ds [Member]
Final Dividend Prior Year [Member]
Jun. 30, 2012
Common stock [Member]
G H Ds [Member]
Interim Dividend One Current Year [Member]
Jun. 30, 2012
Common stock [Member]
G H Ds [Member]
Interim Dividend Two Current Year [Member]
Jun. 30, 2012
Common stock [Member]
ADSs [Member]
Jun. 30, 2012
Common stock [Member]
ADSs [Member]
Final Dividend Prior Year [Member]
Jun. 30, 2012
Common stock [Member]
ADSs [Member]
Interim Dividend One Current Year [Member]
Jun. 30, 2012
Common stock [Member]
ADSs [Member]
Interim Dividend Two Current Year [Member]
Jun. 30, 2012
E Ordinary Shares [Member]
Final Dividend Prior Year [Member]
Dec. 31, 2011
E Ordinary Shares [Member]
Final Dividend Prior Year [Member]
USD ($)
Dec. 31, 2011
E Ordinary Shares [Member]
Final Dividend Prior Year [Member]
ZAR
Jun. 30, 2012
E Ordinary Shares [Member]
Interim Dividend One Current Year [Member]
USD ($)
Jun. 30, 2012
E Ordinary Shares [Member]
Interim Dividend One Current Year [Member]
ZAR
Jun. 30, 2012
E Ordinary Shares [Member]
Interim Dividend Two Current Year [Member]
USD ($)
Jun. 30, 2012
E Ordinary Shares [Member]
Interim Dividend Two Current Year [Member]
ZAR
Dividends Payable [Line Items]                                                      
Declaration date   Feb. 14, 2012     May 08, 2012 May 08, 2012 Aug. 03, 2012 Aug. 03, 2012                         Feb. 14, 2012     May 08, 2012 May 08, 2012 Aug. 03, 2012 Aug. 03, 2012
Record date   Mar. 09, 2012     Jun. 01, 2012 Jun. 01, 2012 Aug. 31, 2012 Aug. 31, 2012                         Mar. 09, 2012     Jun. 01, 2012 Jun. 01, 2012 Aug. 31, 2012 Aug. 31, 2012
Dividend withholding tax rate [Percent] 15.00%                                                    
Dividends Payable, Date to be Paid, Day, Month and Year   Mar. 16, 2012     Jun. 08, 2012 Jun. 08, 2012 Sep. 14, 2012 Sep. 14, 2012   Mar. 16, 2012 Jun. 08, 2012 Sep. 14, 2012   Mar. 19, 2012 Jun. 11, 2012 Sep. 17, 2012   Mar. 26, 2012 Jun. 18, 2012 Sep. 24, 2012 Mar. 16, 2012     Jun. 08, 2012 Jun. 08, 2012 Sep. 14, 2012 Sep. 14, 2012
Common Stock, Dividends, Per Share, Declared [in currency per share]     $ 0.26401 2.00 $ 0.11806 1.00 $ 0.12000 1.00                           $ 0.13201 1.00 $ 0.05903 0.50 $ 0.06000 0.50
Common Stock, Dividends, Per Share, Net of Withholding Tax [in currency per share]     $ 0.26401 2.00 $ 0.10035 0.85 $ 0.10200 0.85                           $ 0.13201 1.00 $ 0.05018 0.425 $ 0.05100 0.425
Share Conversion Ratio Ghanaian Depositary To Ordinary Share (number of shares)                         100                            
Share Conversion Ratio Chess Depositary To Ordinary Share (number of shares)                 0.2                                    
Share Conversion Ratio American Depositary To Ordinary Share (number of shares)                                 1