XML 93 R75.htm IDEA: XBRL DOCUMENT  v2.3.0.11
Investments (Details) (USD $)
In Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Investment in Marketable Securities          
Current Investments $ 203   $ 203   $ 113
Long-Term Investments 1,675   1,675   1,568
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Abstract          
Securities continuous unrealized losses less than 12 months - unrealized losses     89   0
Securities continuous unrealized losses greater than 12 months - unrealized losses     8   8
Securities continuous unrealized losses - unrealized losses     97   8
Available For Sale Securities Continuous Unrealized Loss Position Fair Value Abstract          
Securities continuous unrealized losses less than 12 months - fair value 203   203   0
Securities continuous unrealized losses greater than 12 months - fair value 25   25   24
Securities continuous unrealized losses - fair value 228   228   24
Investments (Textuals) [Abstract]          
Payments to acquire marketable securities     15 7  
Gain on sale of investments, net 50 5 50 7  
Securities continuous unrealized losses - unrealized losses     97   8
New Gold Inc [Member]
         
Investments (Textuals) [Abstract]          
Gain on sale of investments, net     50    
New Gold Inc [Member] | Current [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis         5
Unrealized Gain         54
Unrealized Loss         0
Fair/Equity Basis - Current Marketable Equity Securities         59
Paladin Energy Ltd [Member]
         
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Abstract          
Securities continuous unrealized losses less than 12 months - unrealized losses     67    
Securities continuous unrealized losses greater than 12 months - unrealized losses     0    
Securities continuous unrealized losses - unrealized losses     67    
Available For Sale Securities Continuous Unrealized Loss Position Fair Value Abstract          
Securities continuous unrealized losses less than 12 months - fair value 141   141    
Securities continuous unrealized losses greater than 12 months - fair value 0   0    
Securities continuous unrealized losses - fair value 141   141    
Investments (Textuals) [Abstract]          
Investments acquired 208   208    
Securities continuous unrealized losses - unrealized losses     67    
Paladin Energy Ltd [Member] | Current [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis 208   208    
Unrealized Gain     0    
Unrealized Loss     (67)    
Fair/Equity Basis - Current Marketable Equity Securities 141   141    
Other Equity Securities [Member]
         
Investments (Textuals) [Abstract]          
Investments acquired 73   73    
Other Equity Securities [Member] | Current [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis 28   28   19
Unrealized Gain     36   35
Unrealized Loss     (2)   0
Fair/Equity Basis - Current Marketable Equity Securities 62   62   54
Other Equity Securities [Member] | Long-term [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis 125   125   39
Unrealized Gain     29   37
Unrealized Loss     (20)   0
Fair/Equity Basis - Long-Term Marketable Equity Securities 134   134   76
Marketable Equity Securities [Member]
         
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Abstract          
Securities continuous unrealized losses less than 12 months - unrealized losses     22    
Securities continuous unrealized losses greater than 12 months - unrealized losses     0    
Securities continuous unrealized losses - unrealized losses     22    
Available For Sale Securities Continuous Unrealized Loss Position Fair Value Abstract          
Securities continuous unrealized losses less than 12 months - fair value 62   62    
Securities continuous unrealized losses greater than 12 months - fair value 0   0    
Securities continuous unrealized losses - fair value 62   62    
Investments (Textuals) [Abstract]          
Asset retirement obligation restricted asset 6   6   6
Securities continuous unrealized losses - unrealized losses     22    
Marketable Equity Securities [Member] | Long-term [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis 548   548   448
Unrealized Gain     1,032   1,018
Unrealized Loss     (20)   0
Fair/Equity Basis - Long-Term Marketable Equity Securities 1,560   1,560   1,466
Asset Backed Commercial Paper [Member]
         
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Abstract          
Securities continuous unrealized losses less than 12 months - unrealized losses     0   0
Securities continuous unrealized losses greater than 12 months - unrealized losses     6   6
Securities continuous unrealized losses - unrealized losses     6   6
Available For Sale Securities Continuous Unrealized Loss Position Fair Value Abstract          
Securities continuous unrealized losses less than 12 months - fair value 0   0   0
Securities continuous unrealized losses greater than 12 months - fair value 20   20   19
Securities continuous unrealized losses - fair value 20   20   19
Investments (Textuals) [Abstract]          
Securities continuous unrealized losses - unrealized losses     6   6
Asset Backed Commercial Paper [Member] | Long-term [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis 26   26   25
Unrealized Gain     0   0
Unrealized Loss     (6)   (6)
Fair/Equity Basis - Long-Term Marketable Debt Securities 20   20   19
Auction Rate Securities [Member]
         
Available For Sale Securities Continuous Unrealized Loss Position Aggregate Losses Abstract          
Securities continuous unrealized losses less than 12 months - unrealized losses     0   0
Securities continuous unrealized losses greater than 12 months - unrealized losses     2   2
Securities continuous unrealized losses - unrealized losses     2   2
Available For Sale Securities Continuous Unrealized Loss Position Fair Value Abstract          
Securities continuous unrealized losses less than 12 months - fair value 0   0   0
Securities continuous unrealized losses greater than 12 months - fair value 5   5   5
Securities continuous unrealized losses - fair value 5   5   5
Investments (Textuals) [Abstract]          
Securities continuous unrealized losses - unrealized losses     2   2
Auction Rate Securities [Member] | Long-term [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis 7   7   7
Unrealized Gain     0   0
Unrealized Loss     (2)   (2)
Fair/Equity Basis - Long-Term Marketable Debt Securities 5   5   5
Corporate Debt Securities [Member] | Long-term [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis 7   7   7
Unrealized Gain     2   3
Unrealized Loss     0   0
Fair/Equity Basis - Long-Term Marketable Debt Securities 9   9   10
Debt Securities [Member]
         
Investments (Textuals) [Abstract]          
Asset retirement obligation restricted asset 9   9   10
Debt Securities [Member] | Long-term [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis 40   40   39
Unrealized Gain     2   3
Unrealized Loss     (8)   (8)
Fair/Equity Basis - Long-Term Marketable Debt Securities 34   34   34
Canadian Oil Sands Ltd [Member] | Long-term [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis 320   320   308
Unrealized Gain     570   508
Unrealized Loss     0   0
Fair/Equity Basis - Long-Term Marketable Equity Securities 890   890   816
Gabriel Resources Ltd [Member] | Long-term [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis 80   80   78
Unrealized Gain     270   325
Unrealized Loss     0   0
Fair/Equity Basis - Long-Term Marketable Equity Securities 350   350   403
Regis [Member] | Long-term [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis 23   23   23
Unrealized Gain     163   148
Unrealized Loss     0   0
Fair/Equity Basis - Long-Term Marketable Equity Securities 186   186   171
La Zanja [Member] | Long-term [Member]
         
Investment in Marketable Securities          
Equity Method Investments 72   72   57
Current [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis 236   236   24
Unrealized Gain     36   89
Unrealized Loss     (69)   0
Long-term [Member]
         
Investment in Marketable Securities          
Cost/Equity Basis 669   669   555
Unrealized Gain     1,034   1,021
Unrealized Loss     (28)   (8)
Other Investments, at Cost $ 9   $ 9   $ 11