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Financial Instruments (Unrealized gains losses) (Details) oz in Thousands, lb in Millions, $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Apr. 30, 2020 lb $ / lb | Jun. 30, 2020 USD ($) lb $ / lb $ / lb $ / oz | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) lb oz $ / lb $ / lb $ / oz | Jun. 30, 2019 USD ($)
Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 179 | $ (109) | $ (52) | $ 11
Commodity Contract [Member] |  |  |  |  |
Unrealized gains (losses): |  |  |  |  |
Derivative financial instruments |  | 40 | (13) | 7 | 5
Hedged item – firm sales commitments |  | (40) | 13 | (7) | (5)
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments |  | $ (8) | (3) | $ (17) | (1)
Commodity Contract [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  | 54 |  | 54 |
Derivative, Average Forward Price | $ / lb |  | 2.50 |  | 2.50 |
Copper Forward Contracts [Member] | Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 150 |  |  |  |
Derivative, Average Forward Price | $ / lb | 2.34 |  |  |  |
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments |  | $ 24 |  | $ 24 |
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 16 |
Derivative, Average Forward Price | $ / lb |  | 2.62 |  | 2.62 |
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Amounts recorded in Cost of Sales |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Matured derivative financial instruments |  | $ (4) | (4) | $ 19 | (3)
Copper | Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 162 | (122) | $ (76) | 0
Copper | Short [Member] | Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 314 |
Derivative, Average Forward Price | $ / lb |  | 2.50 |  | 2.50 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / lb |  | 2.73 |  | 2.73 |
Copper | Long [Member] | Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | lb |  |  |  | 116 |
Derivative, Average Forward Price | $ / lb |  | 2.48 |  | 2.48 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / lb |  | 2.73 |  | 2.73 |
Gold | Short [Member] | Embedded Derivative Financial Instruments [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Derivative, Nonmonetary Notional Amount, Mass | oz |  |  |  | 87 |
Derivative, Average Forward Price | $ / oz |  | 1,725 |  | 1,725 |
Realized gains (losses): |  |  |  |  |
Derivative Average Market Price | $ / oz |  | 1,779 |  | 1,779 |
gold and other | Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |  |  |  |
Realized gains (losses): |  |  |  |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net |  | $ 17 | $ 13 | $ 24 | $ 11

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