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Fair Value Measurement (Unaudited) (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Derivatives:    
Derivative assets $ 11 $ 59
Derivatives:    
Derivative liabilities 401 320
Fair Value, Measurements, Recurring [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Investment securities (current and long-term):    
Investment securities 44 [1],[2] 44 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 184 [1],[2],[3] 182 [1],[2],[3]
Derivatives:    
Derivative assets 15 [2],[4] 69 [2],[4]
Derivatives:    
Derivative liabilities 406 [2] 332 [2]
Long-term debt, including current portion 20,850 [5] 20,706 [5]
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value Measurement [Member]
    
Investment securities (current and long-term):    
Investment securities 44 [1],[2] 44 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 184 [1],[2],[3] 182 [1],[2],[3]
Derivatives:    
Derivative assets 15 [2],[4] 69 [2],[4]
Total assets 243 295
Derivatives:    
Derivative liabilities 406 [2] 332 [2]
Long-term debt, including current portion 20,741 [5] 20,487 [5]
Total liabilities 21,147 20,819
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
    
Investment securities (current and long-term):    
Investment securities 22 [1],[2] 23 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 26 [1],[2],[3] 28 [1],[2],[3]
Derivatives:    
Derivative assets 1 [2],[4] 5 [2],[4]
Total assets 49 56
Derivatives:    
Derivative liabilities 7 [2] 1 [2]
Long-term debt, including current portion 0 [5] 0 [5]
Total liabilities 7 1
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
    
Investment securities (current and long-term):    
Investment securities 22 [1],[2] 21 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 158 [1],[2],[3] 154 [1],[2],[3]
Derivatives:    
Derivative assets 14 [2],[4] 64 [2],[4]
Total assets 194 239
Derivatives:    
Derivative liabilities 110 [2] 20 [2]
Long-term debt, including current portion 20,741 [5] 20,487 [5]
Total liabilities 20,851 20,507
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2] 0 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Derivatives:    
Derivative assets 0 [2],[4] 0 [2],[4]
Total assets 0 0
Derivatives:    
Derivative liabilities 289 [2] 311 [2]
Long-term debt, including current portion 0 [5] 0 [5]
Total liabilities 289 311
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative liabilities 99 [2],[4] 16 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative liabilities 99 [2],[4] 16 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative liabilities 99 [2],[4] 16 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative liabilities 288 [2],[4] 309 [2],[4]
Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative liabilities 288 [2],[4] 309 [2],[4]
Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Crude Oil Options [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative liabilities 288 [2],[4] 309 [2],[4]
Fair Value, Measurements, Recurring [Member] | Natural gas swaps [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative liabilities 10 [2],[4] 4 [2],[4]
Fair Value, Measurements, Recurring [Member] | Natural gas swaps [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative liabilities 10 [2],[4] 4 [2],[4]
Fair Value, Measurements, Recurring [Member] | Natural gas swaps [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Natural gas swaps [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative liabilities 10 [2],[4] 4 [2],[4]
Fair Value, Measurements, Recurring [Member] | Natural gas swaps [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative liabilities 8 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative liabilities 8 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative liabilities 7 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative liabilities 1 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[4]  
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative liabilities   1 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative liabilities   1 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative liabilities   1 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative liabilities   0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative liabilities   0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Plains Offshore Warrants [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative liabilities 1 [2],[6] 2 [2],[6]
Fair Value, Measurements, Recurring [Member] | Plains Offshore Warrants [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative liabilities 1 [2],[6] 2 [2],[6]
Fair Value, Measurements, Recurring [Member] | Plains Offshore Warrants [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[6] 0 [2],[6]
Fair Value, Measurements, Recurring [Member] | Plains Offshore Warrants [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative liabilities 0 [2],[6] 0 [2],[6]
Fair Value, Measurements, Recurring [Member] | Plains Offshore Warrants [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative liabilities 1 [2],[6] 2 [2],[6]
Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Investment securities (current and long-term):    
Investment securities 22 [1],[2] 21 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 49 [1],[2],[3] 48 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] | Estimate of Fair Value Measurement [Member]
    
Investment securities (current and long-term):    
Investment securities 22 [1],[2] 21 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 49 [1],[2],[3] 48 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] | Fair Value, Inputs, Level 1 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2] 0 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] | Fair Value, Inputs, Level 2 [Member]
    
Investment securities (current and long-term):    
Investment securities 22 [1],[2] 21 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 49 [1],[2],[3] 48 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] | Fair Value, Inputs, Level 3 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2] 0 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Investment securities (current and long-term):    
Investment securities 18 [1],[2] 18 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 26 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Estimate of Fair Value Measurement [Member]
    
Investment securities (current and long-term):    
Investment securities 18 [1],[2] 18 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 26 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 1 [Member]
    
Investment securities (current and long-term):    
Investment securities 18 [1],[2] 18 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 26 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 2 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2] 0 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 3 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2] 0 [1],[2]
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Investment securities (current and long-term):    
Investment securities 4 [1],[2] 5 [1],[2]
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Estimate of Fair Value Measurement [Member]
    
Investment securities (current and long-term):    
Investment securities 4 [1],[2] 5 [1],[2]
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Investment securities (current and long-term):    
Investment securities 4 [1],[2] 5 [1],[2]
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2] 0 [1],[2]
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Investment securities (current and long-term):    
Investment securities 0 [1],[2] 0 [1],[2]
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 34 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Estimate of Fair Value Measurement [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 34 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Fair Value, Inputs, Level 1 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Fair Value, Inputs, Level 2 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 34 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Fair Value, Inputs, Level 3 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 32 [1],[2],[3] 34 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Estimate of Fair Value Measurement [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 32 [1],[2],[3] 34 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 32 [1],[2],[3] 34 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 27 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Estimate of Fair Value Measurement [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 27 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 1 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 2 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 27 [1],[2],[3] 28 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 3 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 15 [1],[2],[3] 15 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Estimate of Fair Value Measurement [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 15 [1],[2],[3] 15 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Fair Value, Inputs, Level 1 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Fair Value, Inputs, Level 2 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 15 [1],[2],[3] 15 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Fair Value, Inputs, Level 3 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 1 [1],[2],[3] 1 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Estimate of Fair Value Measurement [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 1 [1],[2],[3] 1 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Fair Value, Inputs, Level 1 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Fair Value, Inputs, Level 2 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 1 [1],[2],[3] 1 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Fair Value, Inputs, Level 3 [Member]
    
Legally restricted funds (long-term):    
Legally restricted funds 0 [1],[2],[3] 0 [1],[2],[3]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative assets 13 [2],[4] 63 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative assets 13 [2],[4] 63 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative assets 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative assets 13 [2],[4] 63 [2],[4]
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative assets 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Derivatives:    
Derivative assets 2 [2],[4] 6 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Estimate of Fair Value Measurement [Member]
    
Derivatives:    
Derivative assets 2 [2],[4] 6 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 1 [Member]
    
Derivatives:    
Derivative assets 1 [2],[4] 5 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 2 [Member]
    
Derivatives:    
Derivative assets 1 [2],[4] 1 [2],[4]
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 3 [Member]
    
Derivatives:    
Derivative assets 0 [2],[4] 0 [2],[4]
Fair Value, Measurements, Recurring [Member] | Time Deposits [Member] | Carrying Amount, Fair Value Disclosure [Member]
    
Investment securities (current and long-term):    
Investment securities 210 210
Deferred Option Premiums and Accrued Interest [Member]
    
Derivatives:    
Derivative liabilities $ 387 $ 444
[1] Current portion included in other current assets and long-term portion included in other assets.
[2] Recorded at fair value.
[3] Legally restricted funds excluded $210 million of time deposits (which approximated fair value) at March 31, 2014, and December 31, 2013, associated with the Cerro Verde royalty dispute.
[4] Refer to Note 7 for further discussion and balance sheet classifications. Crude oil options are net of $387 million at March 31, 2014, and $444 million at December 31, 2013, for deferred premiums and accrued interest.
[5] Recorded at cost except for debt assumed in acquisitions, which were recorded at fair value at the respective acquisition dates.
[6] Included in other liabilities.