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Business Segments (Product Revenue) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Revenue from External Customer [Line Items] |  |  |  |
Treatment And Refining Charges Included In Copper Concentrates Revenues | $ (139) | $ (128) | $ (271) | $ (231)
Royalty Expense | (73) | (44) | (142) | (66)
Export Duties Expense | (55) | (27) | (101) | (41)
Revenue from Contract with Customer, Excluding Assessed Tax | 5,212 | 3,677 | 10,197 | 6,892
Revenues | 5,168 | 3,711 | 10,036 | 7,052
Copper In Concentrates [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 1,703 | 1,241 | 3,350 | 2,222
Copper Cathode [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 1,465 | 954 | 2,888 | 1,995
Refined Copper Products [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 668 | 590 | 1,338 | 1,214
Gold |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 933 | 571 | 1,741 | 839
Molybdenum [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 310 | 239 | 596 | 448
Other Products Or Services [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Revenues | 400 | 281 | 798 | 512
Sales [Member] | Not Designated as Hedging Instrument [Member] |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |
Matured derivative financial instruments | $ (44) | $ 34 | $ (161) | $ 160

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