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Dispositions Dispositions (Net Income (Loss) from Discontinued Operations) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Nov. 16, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax $ 32 $ 0    
Net (loss) income from discontinued operations 38 (4)    
Other assets 2,010   $ 1,956  
TF Holdings Limited | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Contingent consideration asset       $ 120
Other assets 49      
Tenke Fungurume [Member] | Discontinued Operations, Held-for-sale [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operation, Revenue 9 285    
Disposal Group, Including Discontinued Operations, Production and delivery 0 226    
Disposal Group, Including Discontinued Operation, Depreciation and Amortization 0 60    
Disposal Group, Including Discontinued Operation, Interest Expense 0 10    
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax 9 (11)    
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax 32 0    
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax 41 (11)    
Discontinued Operation, Tax Effect of Discontinued Operation (3) 7    
Net (loss) income from discontinued operations 38 (4)    
Consolidation, Eliminations [Member]        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Net (loss) income from discontinued operations 0 (10)    
Consolidation, Eliminations [Member] | TF Holdings Limited | Discontinued Operations, Disposed of by Sale        
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]        
Disposal Group, Including Discontinued Operation, Revenue $ (9) $ 32