Dispositions Dispositions (Net Income (Loss) from Discontinued Operations) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 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			$ 38	$ (177)
Net (loss) income from discontinued operations	$ 9	$ (181)	47	(185)
Other assets	1,957		1,957		$ 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]
Disposal Group, Including Discontinued Operation, Costs of Goods Sold			0
Disposal Group, Including Discontinued Operation, Depreciation and Amortization			0
Disposal Group, Including Discontinued Operation, Interest Expense			0
Contingent consideration asset						$ 120
Other assets	55		55
Discontinued Operation, Change in Contingent Receivable	6		42
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	4	272	13	558
Disposal Group, Including Discontinued Operation, Costs of Goods Sold	0	256		482
Disposal Group, Including Discontinued Operation, Depreciation and Amortization	0	20		80
Disposal Group, Including Discontinued Operation, Interest Expense	0	11		21
Disposal Group, Including Discontinued Operation, Other Expense	0	5	0	6
Discontinued Operation, Income (Loss) from Discontinued Operation During Phase-out Period, before Income Tax	4	(20)	13	(31)
Discontinued Operation, Gain (Loss) from Disposal of Discontinued Operation, before Income Tax	6	(177)	38	(177)
Discontinued Operation, Income (Loss) from Discontinued Operation, before Income Tax	10	(197)	51	(208)
Discontinued Operation, Tax Effect of Discontinued Operation	(1)	16	(4)	23
Net (loss) income from discontinued operations	9	(181)	47	(185)
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	(11)	0	(21)
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	$ (4)	$ 41	$ (13)	$ 73