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Financial Instruments (Unrealized gains losses) (Details) oz in Thousands, lb in Millions, $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2021 USD ($) lb oz $ / oz $ / lb $ / lb | Mar. 31, 2020 USD ($)
Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |
Realized gains (losses): |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ 179 | $ (231)
Commodity Contract [Member] |  |
Unrealized gains (losses): |  |
Derivative financial instruments | 3 | (33)
Hedged item – firm sales commitments | (3) | 33
Realized gains (losses): |  |
Matured derivative financial instruments | $ 24 | (9)
Commodity Contract [Member] | Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 66 |
Derivative, Average Forward Price | $ / lb | 3.73 |
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Derivative, Nonmonetary Notional Amount, Mass | lb | 23 |
Derivative, Average Forward Price | $ / lb | 4.09 |
Copper Forward Contracts [Member] | Not Designated as Hedging Instrument [Member] | Amounts recorded in Cost of Sales |  |
Realized gains (losses): |  |
Matured derivative financial instruments | $ (8) | 24
Copper | Not Designated as Hedging Instrument [Member] | Amounts recorded in Sales [Member] |  |
Realized gains (losses): |  |
Embedded Derivative, Gain (Loss) on Embedded Derivative, Net | $ 207 | (238)
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 | 486 |
Derivative, Average Forward Price | $ / lb | 3.83 |
Realized gains (losses): |  |
Derivative Average Market Price | $ / lb | 3.99 |
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 | 123 |
Derivative, Average Forward Price | $ / lb | 3.77 |
Realized gains (losses): |  |
Derivative Average Market Price | $ / lb | 3.99 |
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 | 151 |
Derivative, Average Forward Price | $ / oz | 1,755 |
Realized gains (losses): |  |
Derivative Average Market Price | $ / oz | 1,689 |
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 | $ (28) | $ 7

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