Contingencies and Commitments - Litigation and Dispute Matters (Details) $ in Millions	1 Months Ended
Jan. 31, 2015 USD ($)
St. Joe Minerals Corporation and The Doe Run Company \| Discontinued operations sold \| St. Joe Minerals Corporation and The Doe Run Company litigation matters since December 2010
Litigation and dispute resolution
Payment pursuant to settlement agreement	$ 306

The amount of cash paid for the settlement of litigation or for other legal issues during the period.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3536-108585

Name:	us-gaap_PaymentsForLegalSettlements
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration