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- Definition

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Asset Retirement Obligation

-URI http://asc.fasb.org/extlink&oid=6505190

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 45

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (c)(3)

-URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849

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Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation.

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Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset.

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Amount of the Increase or Decrease in the amount of the asset retirement obligation during the current period for changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation.

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- Definition

The charge against earnings in the period for known or estimated future costs arising from requirements to perform environmental remediation activities.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 410

-SubTopic 30

-Section 50

-Paragraph 12

-URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13296-110859

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Adjustment of the mine reclamation or mine shutdown liability account that is made when estimates of future costs are changed.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

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Reclamation and Remediation (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended				6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Jun. 30, 2013	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reclamation And Remediation Expenses [Abstract]
Reclamation							$ 11	$ 32	$ 61
Accretion							70	64
Reclamation and remediation expense, total	25	20	18	18	36	56	81	96	120
Reconciliation of Reclamation and Remediation Liabilities
Balance at beginning of period				1,539	1,539	1,539	1,539	1,240
Additions, changes in estimates and other							61	308
Liabilities settled							(59)	(73)
Accretion expense							70	64
Balance at end of period	1,611						1,611	1,539	1,240
Reclamation And Remediation (Textuals) [Abstract]
Asset Retirement Obligation	1,611						1,611	1,539	1,240
Additions, changes in estimates and other							61	308
Current portion of reclamation and remediation liabilities	98						98	82
Restricted Cash [Member]
Reclamation And Remediation (Textuals) [Abstract]
Asset retirement obligation restricted assets	11						11	12
Trust Funds [Member]
Reclamation And Remediation (Textuals) [Abstract]
Asset retirement obligation restricted assets	42						42	42
Marketable Equity Securities Long-Term [Member]
Reclamation And Remediation (Textuals) [Abstract]
Asset retirement obligation restricted assets	17						17	16
Operating Segments [Member]
Reclamation And Remediation Expenses [Abstract]
Accretion							61	55	50
Reconciliation of Reclamation and Remediation Liabilities
Balance at beginning of period				1,341	1,341	1,341	1,341
Additions, changes in estimates and other							48	245
Accretion expense							61	55	50
Balance at end of period	1,432						1,432	1,341
Reclamation And Remediation (Textuals) [Abstract]
Asset Retirement Obligation	1,432						1,432	1,341
Additions, changes in estimates and other							48	245
Nonoperating [Member]
Reclamation And Remediation Expenses [Abstract]
Accretion							9	9	9
Reconciliation of Reclamation and Remediation Liabilities
Balance at beginning of period				198	198	198	198
Additions, changes in estimates and other							13	63
Accretion expense							9	9	9
Balance at end of period	179						179	198
Reclamation And Remediation (Textuals) [Abstract]
Asset Retirement Obligation	179						179	198
Additions, changes in estimates and other							$ 13	$ 63