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Statement of Shareholders' Equity (USD $)
In Millions, except Share data
Total
Common stock [Member]
Additional Paid In Capital [Member]
Accumulated other comprehensive income [Member]
Deficit accumulated [Member]
Other Reserves [Member]
Non-controlling interests [Member]
Opening balance at Dec. 31, 2010 $ 4,589 $ 13 $ 8,670 $ (385) $ (3,869) $ 37 $ 123
Opening balance (shares) at Dec. 31, 2010   381,889,139          
Net income/(loss) 723       703   20
Other Comprehensive Income (54)     (52)     (2)
Share of equity accounted joint ventures other comprehensive income (1)         (1)  
Stock Issues As Part Of Share Incentive Scheme (Shares)   319,721          
Stock Issues As Part Of Share Incentive Scheme (Value) 13 0 13        
Stock Issues In Exchange For E Ordinary Shares Cancelled (Shares)   387          
Stock Issues In Exchange For E Ordinary Shares Cancelled (Value) 7 0 7        
E Ordinary shares of common stock issued - Izingwe Holdings (Shares)   280,000          
E Ordinary shares of common stock issued - Izingwe Holdings (Value) 0 0 0        
Stock Issues Transferred From Employee Share Ownership Plan To Exiting Employees (Shares)   13,246          
Stock Issues Transferred From Employee Share Ownership Plan To Exiting Employees (Values) 1 0 1        
Stock based compensation expense 19   19        
Dividends (48)       (43)   (5)
Closing balance at Jun. 30, 2011 5,249 13 8,710 (437) (3,209) 36 136
Closing balance (shares) at Jun. 30, 2011   382,502,493          
Opening balance at Dec. 31, 2011 5,522 13 8,740 (832) (2,575) 36 140
Opening balance (shares) at Dec. 31, 2011   382,965,437          
Net income/(loss) 714       701   13
Other Comprehensive Income (45)     (43)     (2)
Acquisition of noncontrolling interests (215)       (142)   (73)
Stock Issues As Part Of Share Incentive Scheme (Shares)   561,256          
Stock Issues As Part Of Share Incentive Scheme (Value) 20 0 20        
Stock Issues In Exchange For E Ordinary Shares Cancelled (Shares)   8,586          
Stock Issues In Exchange For E Ordinary Shares Cancelled (Value) 1 0 1        
Stock Issues Transferred From Employee Share Ownership Plan To Exiting Employees (Shares)   17,091          
Stock Issues Transferred From Employee Share Ownership Plan To Exiting Employees (Values) 1 0 1        
Stock based compensation expense 12   12        
Dividends (164)       (147)   (17)
Closing balance at Jun. 30, 2012 $ 5,846 $ 13 $ 8,774 $ (875) $ (2,163) $ 36 $ 61
Closing balance (shares) at Jun. 30, 2012   383,552,370