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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.

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