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Fair Value Measurement (Unaudited) (Details) - USD ($) $ in Millions | Sep. 30, 2016 | Jun. 30, 2016 | [6] | Dec. 31, 2015
--- | --- | --- | --- | ---
Derivatives: |  |  |  |  |
Derivative assets |  | $ 48 |  |  | $ 14
Derivatives: |  |  |  |  |
Derivative Liability |  | 8 |  |  | 86
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 27 |  |  | 24
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 13 |  |  | 7
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 3 |  |  | 1
Total assets |  | 43 |  |  | 32
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 0 |  |  | 7
Loss Contingency, Accrual, Noncurrent | [5] | 0 |  |  |
Long-term debt, including current portion | [6] | 0 |  |  | 0
Total liabilities |  | 0 |  |  | 7
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 0 |  |  | 0
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 120 |  |  | 112
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 47 |  |  | 19
Total assets |  | 167 |  |  | 131
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 10 |  |  | 85
Loss Contingency, Accrual, Noncurrent | [5] | 18 |  |  |
Long-term debt, including current portion | [6] | 17,926 |  |  | 13,987
Total liabilities |  | 17,954 |  |  | 14,072
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 0 |  |  | 0
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 0 |  |  | 0
Total assets |  | 0 |  |  | 0
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 0 |  |  | 0
Loss Contingency, Accrual, Noncurrent | [5] | 0 |  |  |
Long-term debt, including current portion | [6] | 0 |  |  | 0
Total liabilities |  | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 9 |  |  | 81
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 0 |  |  | 7
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 1 |  |  | 4
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 0 |  |  | 0
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 |  |  | 0
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds |  | 0 |  |  | 0
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 |  | 0 |  |  | 0
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds |  | 0 |  |  | 0
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 |  |  | 0
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds |  | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 22 |  |  | 21
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 13 |  |  | 7
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 0 |  |  | 0
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Money market funds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 0 |  |  | 0
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 5 |  |  | 3
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Equity securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 37 |  |  | 37
Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 27 |  |  | 28
Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 32 |  |  | 26
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 16 |  |  | 13
Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage-backed securities [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage-backed securities [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 7 |  |  | 7
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage-backed securities [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 1 |  |  | 1
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 47 |  |  | 19
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 3 |  |  | 1
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 0 |  |  | 0
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 0 |  |  | 0
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 51 |  |  | 47
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 188 |  |  | 171
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 50 |  |  | 20
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 10 |  |  | 92
Loss Contingency, Accrual, Noncurrent |  | 18 | [5] | $ 18 |
Long-term debt, including current portion | [6] | 18,982 |  |  | 20,428
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 9 |  |  | 81
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 1 |  |  | 11
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 24 |  |  | 23
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 55 |  |  | 52
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Money market funds [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 22 |  |  | 21
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 13 |  |  | 7
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 5 |  |  | 3
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 37 |  |  | 37
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 27 |  |  | 28
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 32 |  |  | 26
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 16 |  |  | 13
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized mortgage-backed securities [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 7 |  |  | 7
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 1 |  |  | 1
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 47 |  |  | 19
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 3 |  |  | 1
Reported Value Measurement [Member] | Other Current Assets [Member] | Fair Value, Measurements, Recurring [Member] | Time Deposits [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities |  | 28 |  |  | 28
Reported Value Measurement [Member] | Other Assets [Member] | Fair Value, Measurements, Recurring [Member] | Time Deposits [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Escrow Deposit Disbursements Related to Property Acquisition |  | 120 |  |  | 118
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 51 |  |  | 47
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 188 |  |  | 171
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 50 |  |  | 20
Total assets |  | 289 |  |  | 238
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 10 |  |  | 92
Loss Contingency, Accrual, Noncurrent | [5] | 18 |  |  |
Long-term debt, including current portion | [6] | 17,926 |  |  | 13,987
Total liabilities |  | 17,954 |  |  | 14,079
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 9 |  |  | 81
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 1 |  |  | 11
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 24 |  |  | 23
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 55 |  |  | 52
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Money market funds [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 22 |  |  | 21
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 13 |  |  | 7
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 5 |  |  | 3
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 37 |  |  | 37
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 27 |  |  | 28
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 32 |  |  | 26
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 16 |  |  | 13
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized mortgage-backed securities [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 7 |  |  | 7
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 1 |  |  | 1
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 47 |  |  | 19
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 3 |  |  | 1
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 24 |  |  | 23
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 55 |  |  | 52
Derivatives: |  |  |  |  |
Derivative assets | [2],[4] | 0 |  |  | 0
Total assets |  | 79 |  |  | 75
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 0 |  |  | 0
Loss Contingency, Accrual, Noncurrent | [5] | 0 |  |  |
Long-term debt, including current portion | [6] | 0 |  |  | 0
Total liabilities |  | 0 |  |  | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 0 |  |  | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] |  |  |  |  |
Derivatives: |  |  |  |  |
Derivative Liability | [2],[4] | 0 |  |  | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | U.S. core fixed income fund [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 24 |  |  | 23
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 55 |  |  | 52
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Money market funds [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 0 |  |  | 0
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] |  |  |  |  |
Investment securities (current and long-term): |  |  |  |  |
Investment securities | [1],[2] | 0 |  |  | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Government bonds and notes [Member] |  |  |  |  |
Legally restricted funds (long-term): |  |  |  |  |
Legally restricted funds | [1],[2],[3] | 0 |  |  | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] |  |  |  |  |
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[1] | Current portion included in other current assets and long-term portion included in other assets.
[2] | Recorded at fair value.
[3] | Excludes time deposits (which approximated fair value) included in (i) other current assets of $28 million at September 30, 2016, and December 31, 2015, and (ii) other assets of $120 million at September 30, 2016, and $118 million at December 31, 2015, primarily associated with an assurance bond to support PT Freeport Indonesia's (PT-FI) commitment for smelter development in Indonesia.
[4] | Refer to Note 7 for further discussion and balance sheet classifications
[5] | Included in accounts payable and accrued liabilities.
[6] | Recorded at cost except for debt assumed in acquisitions, which were recorded at fair value at the respective acquisition dates.

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