Insurance Claim Reserves Footnote (details) - Asbestos Payment - Asbestos Direct Action Litigation [Member] $ in Millions	Jan. 15, 2015 USD ($)
Loss Contingencies [Line Items]
Payment related to the settlement of the Asbestos Direct Action Litigation impacting gross claims and claim adjustment expense reserves	$ 579
Settlement amount	$ 502

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14326-108349

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