Fair Value Accounting - Quantitative Information (Details) oz in Thousands, $ in Millions	9 Months Ended
Sep. 30, 2015 USD ($) $ / oz oz	Dec. 31, 2014 USD ($)
Quantitative and Qualitative Information - Unobservable Inputs
Financial assets, fair value	$ 26	$ 30
Financial liabilities, fair value	131	189
Boddington Contingent Consideration
Quantitative and Qualitative Information - Unobservable Inputs
Financial liabilities, fair value	10	10
Holt property royalty
Quantitative and Qualitative Information - Unobservable Inputs
Financial liabilities, fair value	121	179
Auction rate securities
Quantitative and Qualitative Information - Unobservable Inputs
Financial assets, fair value	7	6
Asset backed commercial paper
Quantitative and Qualitative Information - Unobservable Inputs
Financial assets, fair value	19	$ 24
Level 3 \| Discounted Cash Flow \| Auction rate securities
Quantitative and Qualitative Information - Unobservable Inputs
Financial assets, fair value	$ 7
Fair Value Inputs, Recoverability Rate	85.00%
Level 3 \| Discounted Cash Flow \| Asset backed commercial paper
Quantitative and Qualitative Information - Unobservable Inputs
Financial assets, fair value	$ 19
Fair Value Inputs, Recoverability Rate	90.00%
Level 3 \| Monte Carlo \| Boddington Contingent Consideration
Quantitative and Qualitative Information - Unobservable Inputs
Financial liabilities, fair value	$ 10
Fair Value Inputs, Discount Rate	5.00%
Fair Value Inputs, Long-term gold price \| $ / oz	1,300
Fair Value Inputs, Long-term copper price \| $ / oz	3.00
Level 3 \| Monte Carlo \| Holt property royalty
Quantitative and Qualitative Information - Unobservable Inputs
Financial liabilities, fair value	$ 121
Fair Value Inputs, Discount Rate	5.00%
Fair Value Inputs, Long-term gold price \| $ / oz	1,300
Level 3 \| Monte Carlo \| Holt property royalty \| Minimum
Quantitative and Qualitative Information - Unobservable Inputs
Weighted average gold production scenarios (in 000's of ounces) \| oz	528
Level 3 \| Monte Carlo \| Holt property royalty \| Maximum
Quantitative and Qualitative Information - Unobservable Inputs
Weighted average gold production scenarios (in 000's of ounces) \| oz	2,559

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Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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Fair value of financial instrument classified as a liability measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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