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Financial Instruments (Unrealized gains losses) (Details)
oz in Thousands, lb in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2018
lb
$ / lb
$ / lb
$ / oz
Jun. 30, 2018
lb
oz
$ / lb
$ / lb
$ / oz
Jun. 30, 2018
USD ($)
$ / lb
$ / lb
$ / oz
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
$ / lb
$ / lb
$ / oz
Jun. 30, 2017
USD ($)
Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member]            
Realized gains (losses):            
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $     $ (44) $ 34 $ (161) $ 160
Commodity Contract [Member]            
Unrealized gains (losses):            
Derivative financial instruments | $     (4) 1 (19) (1)
Hedged item – firm sales commitments | $     4 (1) 19 1
Realized gains (losses):            
Matured derivative financial instruments | $     $ 0 1 $ 2 9
Commodity Contract [Member] | Designated as Hedging Instrument [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, Nonmonetary Notional Amount, Mass | lb 64          
Derivative, Average Forward Price 3.08 3.08 3.08   3.08  
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, Nonmonetary Notional Amount, Mass | lb   46        
Derivative, Average Forward Price 3.16 3.16 3.16   3.16  
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Amounts recorded in Cost of Sales            
Realized gains (losses):            
Matured derivative financial instruments | $     $ 6 (4) $ 8 (5)
Copper | Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member]            
Realized gains (losses):            
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $     $ (14) 35 $ (149) 142
Copper | Short [Member] | Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, Nonmonetary Notional Amount, Mass | lb   532        
Derivative, Average Forward Price 3.12 3.12 3.12   3.12  
Realized gains (losses):            
Derivative Average Market Price 3.01 3.01 3.01   3.01  
Copper | Long [Member] | Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, Nonmonetary Notional Amount, Mass | lb   159        
Derivative, Average Forward Price 3.11 3.11 3.11   3.11  
Realized gains (losses):            
Derivative Average Market Price 3.01 3.01 3.01   3.01  
Gold | Short [Member] | Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, Nonmonetary Notional Amount, Mass | oz   308        
Derivative, Average Forward Price | $ / oz 1,296.18 1,296.18 1,296.18   1,296.18  
Realized gains (losses):            
Derivative Average Market Price | $ / oz 1,254.91 1,254.91 1,254.91   1,254.91  
gold and other [Member] | Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member]            
Realized gains (losses):            
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $     $ (30) $ (1) $ (12) $ 18
Cobalt | Long [Member] | Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member]            
Derivative Instruments, Gain (Loss) [Line Items]            
Derivative, Nonmonetary Notional Amount, Mass | lb   8        
Derivative, Average Forward Price 32.55 32.55 32.55   32.55  
Realized gains (losses):            
Derivative Average Market Price 28.60 28.60 28.60   28.60