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Derivative Instruments (Details)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2011
USD ($)
Jun. 30, 2011
Other Long Term Asset [Member]
USD ($)
Dec. 31, 2010
Other Long Term Asset [Member]
USD ($)
Jun. 30, 2011
Other Long Term Asset [Member]
Diesel Fixed Forward Contracts [Member]
USD ($)
Dec. 31, 2010
Other Long Term Asset [Member]
Diesel Fixed Forward Contracts [Member]
USD ($)
Jun. 30, 2011
Other Long Term Asset [Member]
AU Dollar Operating Fixed Forward Contracts [Member]
USD ($)
Dec. 31, 2010
Other Long Term Asset [Member]
AU Dollar Operating Fixed Forward Contracts [Member]
USD ($)
Jun. 30, 2011
Other Long Term Asset [Member]
NZ Dollar Operating Fixed Forward Contracts [Member]
USD ($)
Dec. 31, 2010
Other Long Term Asset [Member]
NZ Dollar Operating Fixed Forward Contracts [Member]
USD ($)
Jun. 30, 2011
Other Current Asset [Member]
USD ($)
Dec. 31, 2010
Other Current Asset [Member]
USD ($)
Jun. 30, 2011
Other Current Asset [Member]
Diesel Fixed Forward Contracts [Member]
USD ($)
Dec. 31, 2010
Other Current Asset [Member]
Diesel Fixed Forward Contracts [Member]
USD ($)
Jun. 30, 2011
Other Current Asset [Member]
AU Dollar Operating Fixed Forward Contracts [Member]
USD ($)
Dec. 31, 2010
Other Current Asset [Member]
AU Dollar Operating Fixed Forward Contracts [Member]
USD ($)
Jun. 30, 2011
Other Current Asset [Member]
NZ Dollar Operating Fixed Forward Contracts [Member]
USD ($)
Dec. 31, 2010
Other Current Asset [Member]
NZ Dollar Operating Fixed Forward Contracts [Member]
USD ($)
Dec. 31, 2010
Other Current Asset [Member]
Interest Rate Swap Contracts [Member]
USD ($)
Jun. 30, 2011
Other Current Asset [Member]
Forward Starting Swap Contracts [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Diesel Fixed Forward Contracts [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
AU Dollar Operating Fixed Forward Contracts [Member]
USD ($)
Jun. 30, 2011
Other Current Liabilities [Member]
Forward Starting Swap Contracts [Member]
USD ($)
Jun. 30, 2011
Gold [Member]
USD ($)
oz
Jun. 30, 2011
Gold [Member]
USD ($)
oz
Jun. 30, 2011
Copper [Member]
USD ($)
lb
Jun. 30, 2011
Copper [Member]
USD ($)
lb
Jun. 30, 2011
Expected Maturity Date Year 2011 [Member]
Diesel Fixed Forward Contracts [Member]
gal
Jun. 30, 2011
Expected Maturity Date Year 2011 [Member]
AU Dollar Operating Fixed Forward Contracts [Member]
AUD
Jun. 30, 2011
Expected Maturity Date Year 2011 [Member]
AU Dollar Akyem Capital Fixed Forward Contracts [Member]
AUD
Jun. 30, 2011
Expected Maturity Date Year 2011 [Member]
NZ Dollar Operating Fixed Forward Contracts [Member]
NZD
Jun. 30, 2011
Expected Maturity Date Year 2012 [Member]
Diesel Fixed Forward Contracts [Member]
gal
Jun. 30, 2011
Expected Maturity Date Year 2012 [Member]
AU Dollar Operating Fixed Forward Contracts [Member]
AUD
Jun. 30, 2011
Expected Maturity Date Year 2012 [Member]
AU Dollar Akyem Capital Fixed Forward Contracts [Member]
AUD
Jun. 30, 2011
Expected Maturity Date Year 2012 [Member]
NZ Dollar Operating Fixed Forward Contracts [Member]
NZD
Jun. 30, 2011
Expected Maturity Date Year 2013 [Member]
Diesel Fixed Forward Contracts [Member]
gal
Jun. 30, 2011
Expected Maturity Date Year 2013 [Member]
AU Dollar Operating Fixed Forward Contracts [Member]
AUD
Jun. 30, 2011
Expected Maturity Date Year 2013 [Member]
NZ Dollar Operating Fixed Forward Contracts [Member]
NZD
Jun. 30, 2011
Expected Maturity Date Year 2014 [Member]
AU Dollar Operating Fixed Forward Contracts [Member]
AUD
Jun. 30, 2011
Expected Maturity Date Year 2015 [Member]
AU Dollar Operating Fixed Forward Contracts [Member]
AUD
Jun. 30, 2011
Expected Maturity Date Year 2016 [Member]
AU Dollar Operating Fixed Forward Contracts [Member]
AUD
Jun. 30, 2011
Diesel Fixed Forward Contracts [Member]
gal
Jun. 30, 2011
Diesel Fixed Forward Contracts [Member]
Cash Flow Hedging [Member]
USD ($)
Jun. 30, 2010
Diesel Fixed Forward Contracts [Member]
Cash Flow Hedging [Member]
USD ($)
Jun. 30, 2011
Diesel Fixed Forward Contracts [Member]
Cash Flow Hedging [Member]
USD ($)
Jun. 30, 2010
Diesel Fixed Forward Contracts [Member]
Cash Flow Hedging [Member]
USD ($)
Jun. 30, 2011
AU Dollar Operating Fixed Forward Contracts [Member]
AUD
Jun. 30, 2011
AU Dollar Akyem Capital Fixed Forward Contracts [Member]
AUD
Jun. 30, 2011
NZ Dollar Operating Fixed Forward Contracts [Member]
NZD
Jun. 30, 2011
Interest Rate Swap Contracts [Member]
USD ($)
Jun. 30, 2011
Interest Rate Swap Contracts [Member]
Fair Value Hedging [Member]
USD ($)
Jun. 30, 2010
Interest Rate Swap Contracts [Member]
Fair Value Hedging [Member]
USD ($)
Jun. 30, 2011
Interest Rate Swap Contracts [Member]
Fair Value Hedging [Member]
USD ($)
Jun. 30, 2010
Interest Rate Swap Contracts [Member]
Fair Value Hedging [Member]
USD ($)
Jun. 30, 2011
Forward Starting Swap Contracts [Member]
Cash Flow Hedging [Member]
USD ($)
Jun. 30, 2010
Forward Starting Swap Contracts [Member]
Cash Flow Hedging [Member]
USD ($)
Jun. 30, 2011
Fair Value Hedging [Member]
Debentures 8 5/8% (Hedged Portion) [Member]
USD ($)
Jun. 30, 2010
Fair Value Hedging [Member]
Debentures 8 5/8% (Hedged Portion) [Member]
USD ($)
Jun. 30, 2011
Fair Value Hedging [Member]
Debentures 8 5/8% (Hedged Portion) [Member]
USD ($)
Jun. 30, 2010
Fair Value Hedging [Member]
Debentures 8 5/8% (Hedged Portion) [Member]
USD ($)
Jun. 30, 2011
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
USD ($)
Jun. 30, 2010
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
USD ($)
Jun. 30, 2011
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
USD ($)
Jun. 30, 2010
Cash Flow Hedging [Member]
Foreign Exchange Contract [Member]
USD ($)
Foreign Currency Derivatives Abstract                                                                                                                                
Average rate                                                       2.51 0.86 1.04 0.71 2.68 0.88 1.02 0.73 3.19 0.90 0.77 0.87 0.84 0.88 2.62         0.88 1.03 0.72                              
Notional Amount of Foreign Currency Derivatives                                                         594 10 37   947 18 41   665 6 436 204 25           2,871 28 84                              
Expected hedge ratio                                                       53.00% 82.00% 34.00% 66.00% 25.00% 64.00% 41.00% 35.00% 5.00% 44.00% 10.00% 30.00% 14.00% 3.00%                                              
Diesel Derivative Contracts Outstanding                                                                                                                                
Average rate                                                       2.51 0.86 1.04 0.71 2.68 0.88 1.02 0.73 3.19 0.90 0.77 0.87 0.84 0.88 2.62         0.88 1.03 0.72                              
Diesel gallons                                                       11,000,000       11,000,000       1,000,000           23,000,000                                            
Expected hedge ratio                                                       53.00% 82.00% 34.00% 66.00% 25.00% 64.00% 41.00% 35.00% 5.00% 44.00% 10.00% 30.00% 14.00% 3.00%                                              
Fair values of Derivative Instruments Designated as Hedges                                                                                                                                
Other Current and Long Term Assets   167 116 1 1 165 114 1 1 226 196 11 7 204 181 7 5 3 4                                                                                          
Other Current and Long Term Liabilities                                       17 1 1 15                                                                                  
Derivative Instruments (Textuals) [Abstract]                                                                                                                                
Hedge contracts net liability position                                                                                                               11                
Forward starting swaps notional amount                                                                                                             1,000                  
Fixed to floating swap contracts, amount                                                                                                   222                            
Average price                                               1,506.00 1,445.00 4.14 4.26                                                                          
Recorded average provisional price                                               1,500.00 1,441.00 4.22 4.31                                                                          
Provisional pricing mark-to-market gain (loss)                                               10 18 16 28                                                                          
Provisional pricing mark-to-market gain (loss) rate                                               7 6 0.21 0.16                                                                          
Provisional pricing quantity sales                                               105,000 105,000 84,000,000 84,000,000                                                                          
Average price, subject to final pricing                                               1,506.00 1,506.00 4.22 4.22                                                                          
Approximate gain amount to be reclassified from accumulated other comprehensive income, net of tax to income 146                                                                                                                              
Location and Amount of Gains (Losses) Reported in Condensed Consolidated Financial Statements                                                                                                                                
Gain (loss) recognized in other comprehensive income (effective portion)                                                                                     (5) (6) 10 (5)                             126 (99) 193 (58)
Gain (loss) reclassified from Accumulated other comprehensive income into income (effective portion)                                                                                     5 1 9 2                             49 21 91 45
Gains (Losses) Recorded for Hedged Item Related to Fair Value Hedges                                                                                                                                
Gain (loss) recognized in income (effective portion)                                                                                                     1 1 3 3     (1) 2 (6) 2        
Gain (loss) recognized in income (ineffective portion)                                                                                                     $ (1) $ (2) $ (2) $ (2)     $ 0 $ 1 $ 0 $ 1