Amount of letters of credit outstanding under debtor-in-possession financing arrangement.

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-Name Statement of Position (SOP)

-Number 90-7

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

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-Name Accounting Standards Codification

-Topic 944

-SubTopic 40

-Section 50

-Paragraph 3

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=6482485&loc=d3e14764-158437

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-Paragraph 132, 133, 135, 136, 137

-IssueDate 2006-09-01

-Chapter 4

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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended			3 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013	Mar. 31, 2013 Asbestos Claims [Member] claims	Dec. 31, 2012 Asbestos Claims [Member] claims	Mar. 31, 2012 Asbestos Claims [Member] claims
Commitments and Contingencies [Line Items]
Outstanding letters of credit and surety bonds			$ 434
Number of pending asbestos claims				46,070	45,900	48,650
Number of new asbestos claims				1,130
Number of asbestos claims closed or moved to inactive docket				960
Costs for settlement and defense of asbestos claims, net of insurance recoveries and tax benefits	$ 21	$ 33