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Dispositions (Cash Flows from Discontinued Operations) (Details) - Discontinued Operations, Held-for-sale [Member] - Tenke Fungurume [Member]
$ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]  
Net cash provided by operating activities $ 157
Net cash used in investing activities (57)
Net cash used in financing activities (51)
Increase (decrease) in cash and cash equivalents in assets held for sale $ 49