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Fair Value Measurement (Unaudited) (Details) - USD ($) $ in Millions | Mar. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Derivatives: |  |  |
Derivative assets |  | $ 62 | $ 14
Derivatives: |  |  |
Derivative Liability |  | 24 | 86
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Investment securities (current and long-term): |  |  |
Investment securities | [1],[2] | 26 | 24
Legally restricted funds (long-term): |  |  |
Legally restricted funds | [1],[2],[3],[4] | 7 | 7
Derivatives: |  |  |
Derivative assets | [2],[5] | 3 | 1
Total assets |  | 36 | 32
Derivatives: |  |  |
Derivative Liability | [2],[5] | 5 | 7
Long-term debt, including current portion | [6] | 0 | 0
Total liabilities |  | 5 | 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],[4] | 116 | 112
Derivatives: |  |  |
Derivative assets | [2],[5] | 67 | 19
Total assets |  | 183 | 131
Derivatives: |  |  |
Derivative Liability | [2],[5] | 27 | 85
Long-term debt, including current portion | [6] | 16,679 | 13,987
Total liabilities |  | 16,706 | 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],[4] | 0 | 0
Derivatives: |  |  |
Derivative assets | [2],[5] | 0 | 0
Total assets |  | 0 | 0
Derivatives: |  |  |
Derivative Liability | [2],[5] | 0 | 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],[5] | 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],[5] | 24 | 81
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 0 | 0
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 3 | 7
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 3 | 4
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 0 | 0
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 2 |
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 0 |
Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 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],[4] | 7 | 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],[4] | 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],[4] | 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] | 4 | 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],[4] | 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],[4] | 33 | 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],[4] | 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],[4] | 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],[4] | 32 | 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],[4] | 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],[4] | 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],[4] | 29 | 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],[4] | 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],[4] | 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],[4] | 14 | 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],[4] | 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],[4] | 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],[4] | 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],[4] | 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],[4] | 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],[4] | 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],[4] | 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],[5] | 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],[5] | 66 | 19
Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Derivatives: |  |  |
Derivative assets | [2],[5] | 0 | 0
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |
Derivatives: |  |  |
Derivative assets | [2],[5] | 3 | 1
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |
Derivatives: |  |  |
Derivative assets | [2],[5] | 1 | 0
Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |
Derivatives: |  |  |
Derivative assets | [2],[5] | 0 | 0
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Investment securities (current and long-term): |  |  |
Investment securities | [1],[2] | 49 | 47
Legally restricted funds (long-term): |  |  |
Legally restricted funds | [1],[2],[3],[4] | 176 | 171
Derivatives: |  |  |
Derivative assets | [2],[5] | 70 | 20
Derivatives: |  |  |
Derivative Liability | [2],[5] | 32 | 92
Long-term debt, including current portion | [6] | 20,777 | 20,428
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 24 | 81
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 6 | 11
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 2 |
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] | 23 | 23
Legally restricted funds (long-term): |  |  |
Legally restricted funds | [1],[2],[3],[4] | 53 | 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],[4] | 7 | 7
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Equity securities [Member] |  |  |
Investment securities (current and long-term): |  |  |
Investment securities | [1],[2] | 4 | 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],[4] | 33 | 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],[4] | 32 | 28
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] |  |  |
Legally restricted funds (long-term): |  |  |
Legally restricted funds | [1],[2],[3],[4] | 29 | 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],[4] | 14 | 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],[4] | 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],[4] | 1 | 1
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] |  |  |
Derivatives: |  |  |
Derivative assets | [2],[5] | 66 | 19
Reported Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] |  |  |
Derivatives: |  |  |
Derivative assets | [2],[5] | 4 | 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 |  | 29 | 28
Reported Value Measurement [Member] | Other Assets [Member] | Fair Value, Measurements, Recurring [Member] | Time Deposits [Member] |  |  |
Derivatives: |  |  |
Escrow Deposit Disbursements Related to Property Acquisition |  | 119 | 118
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Investment securities (current and long-term): |  |  |
Investment securities | [1],[2] | 49 | 47
Legally restricted funds (long-term): |  |  |
Legally restricted funds | [1],[2],[3],[4] | 176 | 171
Derivatives: |  |  |
Derivative assets | [2],[5] | 70 | 20
Total assets |  | 295 | 238
Derivatives: |  |  |
Derivative Liability | [2],[5] | 32 | 92
Long-term debt, including current portion | [6] | 16,679 | 13,987
Total liabilities |  | 16,711 | 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],[5] | 24 | 81
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 6 | 11
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 2 |
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] | 23 | 23
Legally restricted funds (long-term): |  |  |
Legally restricted funds | [1],[2],[3],[4] | 53 | 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],[4] | 7 | 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] | 4 | 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],[4] | 33 | 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],[4] | 32 | 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],[4] | 29 | 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],[4] | 14 | 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],[4] | 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],[4] | 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],[5] | 66 | 19
Estimate of Fair Value Measurement [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] |  |  |
Derivatives: |  |  |
Derivative assets | [2],[5] | 4 | 1
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] |  |  |
Investment securities (current and long-term): |  |  |
Investment securities | [1],[2] | 23 | 23
Legally restricted funds (long-term): |  |  |
Legally restricted funds | [1],[2],[3],[4] | 53 | 52
Derivatives: |  |  |
Derivative assets | [2],[5] | 0 | 0
Total assets |  | 76 | 75
Derivatives: |  |  |
Derivative Liability | [2],[5] | 0 | 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],[5] | 0 | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 0 | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Copper forward contracts [Member] |  |  |
Derivatives: |  |  |
Derivative Liability | [2],[5] | 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] | 23 | 23
Legally restricted funds (long-term): |  |  |
Legally restricted funds | [1],[2],[3],[4] | 53 | 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],[4] | 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],[4] | 0 | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Government mortgage-backed securities [Member] |  |  |
Legally restricted funds (long-term): |  |  |
Legally restricted funds | [1],[2],[3],[4] | 0 | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] |  |  |
Legally restricted funds (long-term): |  |  |
Legally restricted funds | [1],[2],[3],[4] | 0 | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Asset-backed securities [Member] |  |  |
Legally restricted funds (long-term): |  |  |
Legally restricted funds | [1],[2],[3],[4] | 0 | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Collateralized mortgage-backed securities [Member] |  |  |
Legally restricted funds (long-term): |  |  |
Legally restricted funds | [1],[2],[3],[4] | 0 | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member] |  |  |
Legally restricted funds (long-term): |  |  |
Legally restricted funds | [1],[2],[3],[4] | 0 | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Embedded derivatives in provisional sales/purchases contracts [Member] |  |  |
Derivatives: |  |  |
Derivative assets | [2],[5] | 0 | 0
Net Asset Value [Member] | Fair Value, Measurements, Recurring [Member] | Copper futures and swap contracts [Member] |  |  |
Derivatives: |  |  |
Derivative assets | [2],[5] | $ 0 | $ 0
[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 other assets of $119 million at March 31, 2016, and $118 million at December 31, 2015, associated with an assurance bond to support PT Freeport Indonesia's (PT-FI) commitment for smelter development in Indonesia.
[4] | Excludes time deposits (which approximated fair value) included in other current assets of $29 million at March 31, 2016, and$28 million at December 31, 2015
[5] | Refer to Note 6 for further discussion and balance sheet classifications.
[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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- Definition Represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption, parenthetical disclosure or within the fair value disclosures required in the footnote disclosures to the financial statements. This item represents the amount of trust assets (current and long-term) existing as of the balance sheet date. + References No definition available. + Details
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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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