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Investments - Marketable Securities - Amortized Cost/Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Investments    
Unrealized Gain   $ 4
Unrealized Loss   (2)
Investments, Cost/Equity Basis   332
Investments, Fair/Equity Basis $ 378 334
TMAC    
Investments    
Equity Method Investments 104  
Marketable Equity Securities    
Investments    
Cost/Equity Basis 98  
Unrealized Gain 43  
Fair/Equity Basis - Long-Term Marketable Securities 141  
Marketable Equity Securities | Regis Resources Ltd.    
Investments    
Cost/Equity Basis 81  
Unrealized Gain 41  
Fair/Equity Basis - Long-Term Marketable Securities 122  
Marketable Equity Securities | Other Marketable Equity Securities    
Investments    
Cost/Equity Basis 17  
Unrealized Gain 2  
Fair/Equity Basis - Long-Term Marketable Securities 19  
Current    
Investments    
Unrealized Gain   3
Unrealized Loss   (19)
Certificate of deposit   25
Marketable securities and certificates of deposit   89
Marketable securities and certificates of deposit, Fair/Equity Basis   73
Current | Marketable Equity Securities    
Investments    
Cost/Equity Basis 25 64
Unrealized Gain 3 3
Unrealized Loss (3) (19)
Fair/Equity Basis - Current Marketable Equity Securities 25 48
Current | Marketable Equity Securities | Gabriel Resources Ltd    
Investments    
Cost/Equity Basis 9 34
Unrealized Loss   (17)
Fair/Equity Basis - Current Marketable Equity Securities 9 17
Current | Marketable Equity Securities | Other Marketable Equity Securities    
Investments    
Cost/Equity Basis 16 30
Unrealized Gain 3 3
Unrealized Loss (3) (2)
Fair/Equity Basis - Current Marketable Equity Securities 16 31
Noncurrent    
Investments    
Unrealized Gain 44  
Unrealized Loss (1)  
Other investments, at cost 14 14
Investments, Cost/Equity Basis 335  
Investments, Fair/Equity Basis 378  
Noncurrent | Euronimba Ltd    
Investments    
Equity Method Investments 2 2
Noncurrent | Minera La Zanja S.R.L.    
Investments    
Equity Method Investments 77 101
Noncurrent | Novo Resources Corp    
Investments    
Equity Method Investments 14 15
Noncurrent | TMAC    
Investments    
Equity Method Investments 104  
Noncurrent | Marketable Equity Securities    
Investments    
Cost/Equity Basis   170
Unrealized Gain   2
Fair/Equity Basis - Long-Term Marketable Securities   172
Noncurrent | Marketable Equity Securities | Regis Resources Ltd.    
Investments    
Cost/Equity Basis   153
Fair/Equity Basis - Long-Term Marketable Securities   153
Noncurrent | Marketable Equity Securities | Other Marketable Equity Securities    
Investments    
Cost/Equity Basis   17
Unrealized Gain   2
Fair/Equity Basis - Long-Term Marketable Securities   19
Noncurrent | Asset backed commercial paper    
Investments    
Cost/Equity Basis 18 22
Unrealized Gain 1 2
Fair/Equity Basis - Long-Term Marketable Securities 19 24
Noncurrent | Auction rate securities    
Investments    
Cost/Equity Basis 8 8
Unrealized Loss (1) (2)
Fair/Equity Basis - Long-Term Marketable Securities 7 6
Noncurrent | Marketable Debt Securities    
Investments    
Cost/Equity Basis 26 30
Unrealized Gain 1 2
Unrealized Loss (1) (2)
Fair/Equity Basis - Long-Term Marketable Securities $ 26 $ 30