Income and Mining Taxes - Tax Expense Reconciliation (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Reconciling item, percentage
Tax at statutory rate	35.00%	35.00%	35.00%	35.00%
Percentage depletion	(4.00%)	(152.00%)	(4.00%)	(25.00%)
Change in valuation allowance on deferred tax assets	(5.00%)	(124.00%)	5.00%	(36.00%)
Mining and other taxes	6.00%	24.00%	4.00%	5.00%
Disallowed loss on Midas Sale	2.00%	32.00%	1.00%	8.00%
Effect of foreign earnings, net of credits	1.00%		2.00%	3.00%
Other		(3.00%)		1.00%
Income and mining tax expense (benefit)	35.00%	(188.00%)	43.00%	(9.00%)
Reconciling item, amount
Income (loss) before income and mining tax and other items	$ 437	$ 25	$ 1,158	$ 260
Tax at statutory rate	153	9	405	91
Percentage depletion	(18)	(38)	(52)	(66)
Change in valuation allowance on deferred tax assets	(25)	(31)	57	(93)
Mining and other taxes	27	6	51	14
Disallowed loss on Midas Sale	7	8	7	21
Effect of foreign earnings, net of credits	6		26	8
Other	1	(1)	2	3
Income and mining tax expense (benefit)	$ 151	$ (47)	$ 496	$ (22)

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